Review of the upper limb Flashcards
(146 cards)
1
Q
Where does the axillary artery run between? [2]
A
lateral border 1st rib to inferior border of teres major
2
Q
What are the spinal cords routes of the brachial plexus? [1]
A
C5-T1
3
Q
Brachial plexus
What are the anterior cord nerves [3]
What are the posterior cord nerves [2]
A
Anterior cord (lateral to medial)
* Musculocutaneous
* Median
* Ulnar
Posterior cord
* Axillary
* Radial
4
Q
brachial plexus qs
A
5
Q
How do you differentiate between fractured clavicle or dislocated shoulder?
A
Look for rounded profile of the shoulder:
Shoulder dislocation:
* Shoulder squared off – can see acromioclavicular joint
Clavicular fracture:
* Rounded profile of shoulder - SCM pulls medium section upwards. Tenting of the joint
Clavicle on left; shoulder dislocation on right
6
Q
Explain when and why a clavicle fracture is an emergency [2]
A
If nerve tinglings and loss of sensation. Can cause damage to:
- Subclavian artery underneath damage
- Brachial plexus: sandwiched between clavicle and first rib
7
Q
Which muscle is causing this fractured clavicle to shorten the width of the shoulder? [1]
A
Pectoralis major (major adductor – brings arm closer) have lifted the shoulder up and shorten the width
8
Q
Which nerve is at risk from shoulder dislocation
- Musculocutaneous
- Median
- Ulnar
- Axillary
- Radial
A
Which nerve is at risk from shoulder dislocation
Axillary
9
Q
Which structure in the shoulder is at risk of damage from shoulder dislocation that increases liklihood of refracture [1]
A
Glenoid labrum
10
Q
Paralysis of the deltoid muscle restricts which type of movement? [1]
A
Abduction
11
Q
Where does lymph from lateral [1] and medial [1] breast drain?
A
Lateral breast drain to axillary nodes
Medial breast drains to parasternal nodes
12
Q
Describe scapulo-humeral rhythm [2]
A
Scapula and humerus move in a 1:2 ratio.
When the arm is abducted 180 degrees, 60 degrees occurs by roation of the scapula and 120 degrees by rotation of the humerus at the shoulder joint
13
Q
During total 180 degrees of abduction, [] degress is from glenohumeral joint and [] degrees from scapulothoracic joint
A
120: glenohumeral joint
80: scapulothoracic joint
14
Q
Metastatic breast cancer surgery frequently involves clearance of which lymph node? [1]
A
axillary lymph node clearance
15
Q
Which nerves [2] and muscles [2] are at risk of from axillary lymph node clearance? [2]
A
Injury to thoracodorsal nerve; Latissimus dorsi
Injury to long thoracic nerve; serratus anterior - causes winging scapula
16
Q
Label 1-5
A
- Pec major
- Pec minor
- Axillary vein
- Thoracodorsal
- Long thoracic
17
Q
Label B & C
A
B = thoracodorsal
C = long thoracic
18
Q
Label A-C
A
A: Pec major
B: serratus anterior
C: long thoracic nerve
19
Q
peripheral odeam?A
A
20
Q
Name 4 occassions that long thoracic nerve is at risk [4]
A
Stab wound
Thoracic surgery
Chest tube insertion
Crushed between clavicle and 1st rib
21
Q
Which nerve supplies the trapezius? [1]
A
Spinal accessory nerve (CN XI)
22
Q
How does spinal accessory nerve damage present? [4]
A
- Weak shoulder abduction not as prominent winging of scapula
- Loss of adduction - DOUBLE CHECK
- Atrophy of trapezius
- Shoulder falls
23
Q
Name a mechanism by which spinal accessory nerve can be damaged? [1]
Which muscles does the spinal accessory nerve innervate? [2]
A
Tumour around jugular foramen [1]
Innervates trapezius and the sternocleidomastoid muscles.
Causes winging of the scapula that is much less pronounced compared to S
24
Q
What are the two types of joint in the elbow? [2]
A
A hinge joint: hand to the body
A pivot joint: turns hand over (pronation / supination)
25
What muscle groups are found in the anterior forearm? [2]
Which arteries are found within the anterior forearm [2]
Which nerves are found within the anterior forearm [2]
Muscle groups:
* **Flexors**
* **Pronators**
Arteries;
* **Radial artery**
* **Ulnar artery**
Nerves:
* **Median nerve**
* **Ulnar nerve**
26
Which arteries supply posterior forearm? [2]
Ulnar and radial arteries
double chekc !!
27
State how ulna and radial articulate with the hand
**Ulna** **does not** articulate with carpals
**Radius** articulates with **scaphoid and lunate**
28
which of the following is the only articulation between upper limb and axial skeleton?
- sternoclavicular joint
- acromiclavicular joint
- glenohumeral joint
- scapulothrocic joint
**ssternoclavicular joint**
29
# Sternoclavicular joint:
What is the type of joint? [1]
Which structure is present for shock absorption? [1]
Which type of movement does the joint permit? [1] ?
joint type: **synovial, saddle joint**
shock absoption: **articular disc**
movements: **around 60 degrees when elevate scapula**
30
Which nerve is at risk here? [1]
median
31
Which nerve is damaged if atrophy of thenar group occurs? [1]
median
32
If you break your clavicle, which structures act and cause different movements of the clavicle? [3]
What do u need to help bring bones back together to heal? [1]
- **Sternocleidomastoid muscle**: pulls medial aspect of clavicle up
- **Pectoralis major** muscle pulls arm and clavicle **medially**
- **Gravity** will pull **down**
- need an **internal fixation**
33
# Acromioclavicular joint?
Which joint is present? [1]
What type of movement does this allow? [1]
which bones does this joint connection? [2]
_what type of joint is the acromioclavicular joint? [2]_
- synovial [1]; **plane joint** [1]
- **gliding** movement [1]
_what is a connection between? [1]_
- acromonion of scapula
- clavicle
34
label these xox
which of these labels are joining points for muscles? [3]
_which of these labels are joining points for muscles? [3]_
- coracoid process
- supraspinous fossa
- infraspinous fossa
35
# glenohumeral joint:
What is the type of joint? [2}
Which movements does this joint permit? [5]
**Joint:**
- synovial [1]; **ball & socket** [1]
**Movements:**
- flexion-extension
- abduction
- adduction
- rotation
- circumduction
36
what are two prominent structures / features of the the glenohumeral joint? [2]
Why is this clinically significant [1]
_what are two prominent features of the glenohumeral joint? _
**glenoid cavity** accomodates approx/ 1/3 of the humeral head: means that should can have wider range of movement
**inferior joint capusule is lax.** allows elevate above head. but means is much weaker than superior portion
37
what is most common type of dislocation of the glenohumeral joint? [1]
What type of movements cause ^ [3}
_what is most common type of dislocation of the glenohumeral joint? [1]_
- **anterior dislocation**
_what type of movements cause ^ [3}_
- abduction
- external rotation
- external extension
38
which nerve can be effected glenohumeral dislocation? [1]
which muscle does this nerve particularly effect if damaged? [1]
**axillary nerve**
**deltoid muscle**
39
Which structures deepen the shallow glenoid fossa? [2]
_what is the shallow glenoid fossa deepened by? [2]_
- **glenoid labrum** (fibrocart. ring that surrounds articular surface). helps deepen the socket and support the joint
- **long head of the biceps** - attaches to superior aspect of labrum
40
# Scapulotharacic joint
What is the type of joint [1]?
Which movements does this joint allow? [3]
**not a true joint** articulation between scapula and thoracic wall
**movements:**
- elevation & depression
- protraction & retraction
- rotation - important in abduction
41
what is the scapula-humeral rthym?
_First 30 degrees of shoulder elevation involves a "setting phase":_
- the movement is largely **glenohumeral**.
- scapulothoracic movement is small and inconsistent.
_And after the first 30 degrees of shoulder elevation:_
- The **glenohumeral and scapulothoracic joint**s move **simultaneously**.
- Overall **2:1 ratio of glenohumeral to scapulothoracic movement.**
(e.g. when the arm is abducted 180 degrees, 60 degrees by rotation of the scapula & 120 degrees occurs by rotation of the humerus at the glenohumeral joint)
42
which part of the humerus is most likely to break? [1]
**surgical head !**
43
label A-E
A: acromioclavicular joint
B: corocoid process
C: clavicle
D: acromion
E: glenoid fossa
44
which nerve is the trapezuius innervated by? [1]
why is this special?
```
accessry nerve (CNXI)
special bc all other muscles are innervated from brachial plexus
```
45
# latissimus dorsi
Movements of the latissimus dorsi? [3]
runs from lower thoracic vertebra onto the lumbar vertebra & iliac crest. runs from iliac crest to anterior aspect of the humerus
movements:
- extend, adduct and medially rotate the shoulder
46
# teres major
Movements of the teres major? [3]
runs from:
- inferior angle of scapula to anterior aspect of humerus
movements:
- extend, adduct and medially rotate the shoulder
47
# deltoid muscle
What are the three heads of the deltoid muscle? [3]
What movements do each head permit? [3]
Which nerve innervates the deltoid muscle? [1]
Heads:
* **anterior** : flexion of arm
* **posterior**: extension of arm
* **middle** abduction of arm: **major one**
Innervation
* **axillary nerve**
48
# Rotator cuff musles
What are names of the different rotator cuff muscles [4]
What rotator cuff muscles are located posterioly? [3]
Which rotator cuff is found anteriorly? [1]
- surround the glenohumeral joint and stabilise the joint
- deep !
Posterior:
* **supraspinatus muscle**: superior to scapula spine
* **infraspinatus muscle:** inferior to scapula spine
* **teres minor:** inferior to infraspinatus
Anterior:
**subscapualris muscle**
49
Which muscle initates the first 10 degrees of abduction? [1]
supraspinatus
50
51
Why is the long thoracic nerve easy to damage? [1]
Runs anterior to the muscle [1]
52
53
Which of the following is the glenoid labrum?
A
B
C
D
E
Which of the following is the glenoid labrum?
A
B
**C**
D
E
54
Which of the following is the acromion?
A
B
C
D
E
Which of the following is the acromion?
**A**
B
C
D
E
55
Which of the following is the scapula?
A
B
C
D
E
Which of the following is the scapula?
A
B
C
D
**E**
56
Which of the following is the supraspinatus muscle?
A
B
C
D
E
Which of the following is the supraspinatus muscle?
A
B
C
**D**
E
57
Which of the following is the glenoid labrum
A
B
C
D
E
Which of the following is the glenoid labrum
A
B
**C**
D
E
58
Which of the following is the glenoid cavity
A
B
C
D
E
Which of the following is the glenoid cavity
A
**B**
C
D
E
59
What is muscle D? [1]
What is bone E? [1]
D: supraspinatus
E: Acromion
60
Which of the following is the articular capsule
A
B
C
D
E
Which of the following is the articular capsule
**A**
B
C
D
E
61
Which of the following is the articular capsule
A
B
C
D
E
Which of the following is the articular capsule
**A**
B
C
D
E
62
which arteries, found in the hand, do the ulnar [1] & radius [1] arteries supply?
radial artery gives rise to **deep palmar arch**
ulnar artery gives rise to **superficial palmar arch**
63
64
3 main superficial veins of upper arm? [3]
65
66
67
what are the 5 branches of brachial plexus?
- Muscularcutaneous
- axillary
- median
- radial
- ulnar nerve
## Footnote
**most alcoholics must really urinate !**
68
where do each of the following arrive from?
- Muscularcutaneous
- axillary
- median
- radial
- ulnar nerve
where do each of the following arrive from?
- Muscularcutaneous: **C5-C7**
- axillary: **C5-C6**
- median: **C5-T1**
- radial: **C5-T1**
- ulnar nerve; **C8-T1**
69
70
What is the best way to id the different nerves of the brachial plexus?
Musculocutaneous, median & ulnar are **anterior to axillary artery** & form **M shape**
Behind axillary artery: **
superior - axillary, inferior - radial**
71
median nerve
72
# Musculocutaneous nerve
Which group of muscles does the musculocutaneous nerve supply? [1]
Name the muscles [3]
Where is the sensory area that the musculocutaneous arm supplies? [1]
musculocutanous supplies the **flexor compartment** _motor supply_:
- **bicep brachialis**
- **brachialis**
- **corachbrachialis**
musculocutanous supplies the flexor compartment _sensory supply_:
- **skin of lateral forarm**
73
which of the nerves from brachial plexus, if damaged, would result in a loss of shoulder abduction beyond 15 degrees?
- Muscularcutaneous
- axillary
- median
- radial
- ulnar nerve
which of the nerves from brachial plexus, if damaged, would result in a loss of shoulder abduction beyond 15 degrees?
**axillary**
74
# Median nerve
Describe the path of the median nerve to the hand [3]
Which muscles does median nerve supply motor innervation to? [2]
Which area of skin does median nerve provide sensory innervation for? [1]
Path:
* **medial to biceps brachii** with the brachial artery
* then runs **anteriorly** at the **cubital fossa** to enter the forearm.
* It then passes through the **carpal tunnel** to reach the hand
Motor:
- **supplies the majority of the flexor compartment** - **wrist flexion**
- **thumb**
Sensory:
-**Sensory fibres innervate the skin over lateral palm, digits 1-3.**
75
# Radial nerve
Describe the path of the radial nerve [1]
Which muscles does the radial nerve supply motor innervation to [2]
which skin does it provide sensory innervation for? [3]
Path:
- runs **posteriorly** all down arm
Motor innervation:
* **tricep brachii**
- all **muscles on posterior aspect of arm and forearm** -
Movement:
- **extension** of the wrist
Sensory innervation:
* **posterior arm to wrist**
- **dorsal hand**
- base of **digits 1-3 and thumb**
76
# Ulnar nerve
Describe the path of the ulnar nerve [1]
Which muscles does the ulnar nerve provide motor innervation to? [2]
Where does ulnar nerve provide sensory innervation to [3]
Path:
- runs **medially** in the arm and passes **posterior the medial epidcondlye**
Motor innervation:
* **flexor carpi ulnaris**
* ulnar half of **flexor digitorum profundus** in forearm
Sensory innervation:
- **medial dorsal and plantar hand, digits 3.5-5**
77
78
79
What is Erb's palsy caused by damage to? [1]
which nerves? [3]
what does it result in? [3]
**_Erbs palsy:_**
- Damage to the **superior trunk of the brachial plexus**.
- This happens quite commonly in difficult birth (pulling the head away from the upper limb) results in nerve palsy.
- Damaging C5 and C6 mainly affects **musculocutaneous, axillary and medial nerve. It results in:**
* Adducted shoulder
* Medially rotated arm
* Extended elbow
80
Name 3 important nerves from brachial plexus that do not do not enter the upper limb? [3]
State which muscles do they provide motor innervation for?
**Long Thoracic**: C5, C6, C7. This innervates the _serratus anterior muscle_, which is important in keeping your scapula attached to your thoracic cage. C5,6,7, wings to heaven (damage to this causes winged scapula)
**Thoracodorsal:** C6, C7, C8. This supplies the _Latissimus dorsi._
**Suprascapular:** C5, C6 This innervates the _Supraspinatus, infraspinatu_s (other rotator cuff innervated by axillary nerve)
81
radial nerve
82
Label A-D
A: **Latissimus dorsi muscle** forming the posterior axillary fold
B: **Subscapularis muscle**
C:**Deltoid**
D: **External abdominal oblique muscle**
83
Label A-D
A: **Brachialis**
B: **Long head of biceps brachii muscle**
C: **Deltoid muscle** (insertion on humerus)
D: **Short head of biceps brachii muscle**
84
Label A-E
A: bicep brachii
B: triceps brachii
C: brachioradialis
D: subscapularis
E: Axillary artery
85
Label A
Brachioradialis muscle
86
Label A-C
A: Coracobrachialis muscle
B: Teres major
C: Medial head of triceps brachii muscle
87
Label 1-5
1: bicep brachii
2: brachialis
3: Pronator teres muscle
4: Brachioradialis muscle
5: Pronator quadratus muscle
88
Which of the following is the median nerve
A
B
C
D
E
Which of the following is the median nerve
A
**B**
C
D
E
89
Which of the following is the radial nerve
A
B
C
D
E
Which of the following is the radial nerve
**A**
B
C
D
E
90
Which of the following is the brachial artery
A
B
C
D
E
Which of the following is the brachial artery
A
B
C
**D**
E
91
Label E [1]
Pronator teres
92
Label E [1]
Pronator teres
93
Label A [1]
supinator muscle
94
Label A [1]
supinator muscle
95
Which of the following is the radial nerve
1
2
3
4
Which of the following is the radial nerve
1
2
3
**4**
96
Which of the following is the median nerve
1
2
3
4
Which of the following is the median nerve
1
2
**3**
4
97
Which of the following is the ulnar artery and nerve
1
2
3
4
Which of the following is the ulnar artery and nerve
**1**
2
3
4
98
Which of the following is the carpal tunnel
1
2
3
4
Which of the following is the carpal tunnel
1
**2**
3
4
99
Which of the following is the carpal tunnel
1
2
3
4
Which of the following is the carpal tunnel
1
**2**
3
4
100
Label A-D
A: radial artery
B: ulnar artery
C: Anterior interosseous
arteries
D: ulnar artery
101
A - musculocutaneous nerve
B - median nerve
C - axillary nerve
D - ulnar nerve
102
what is 1 & 2?
2 coracobrachialis
1. brachialis
103
which is this muscle?
bicep brachii
104
what muscle is this
brachialis
105
# Bicep brachii
Where do the 2 heads of the bicep brachii attach? [2]
The two heads join together and attach onto which bone? [1]
**Describe the movements of the bicep brachii muscle [2]**
Location of 2 heads:
- short head - **found** **medially.** attaches to **corocoid process **
- long head - **found laterally** (L4L) attaches to **supraglenoid tubercle**
Join together to form one muscle, together **inserts onto radius at the radial tuborisity**
movements:
- powerful **supinator**
- **flexor** and **shoulder** and **elbow**
106
which muscles are used to flex your forarm when:
a) pronated
b) supinated
**pronated forearm** - brachialis used to flex elbow joint
**supinated forarm -** brachiali and bicep brachii flex elbow joints
107
ruptured one of bicep brachii tendons -\> causes muscles to bunch and shoot down arm
108
# Tricep brachii
What are the three heads of the tricep brachii? [3]
Where does the tricep brachii insert inferiorly [1]
Which movements does tricep brachii permit? [2]
Which nerve is the tricep brachii innervated by? [1]
Heads:
* long head - passes over shoulder joint
* lateral head
* medial head
Insertion:
* Join together to form one common muscle: tendon inserts on **olecranon process** of elbow (pointy bit)
Movements:
- **extend elbow**
- **weak shoulder extensor**
Innervation:
* **radial nerve**
109
Describe path of the median nerve [2]
* Rruns in **anterior** compartment of upper arm
* Crosses over the anterior aspect of the elbow to **enter anterior compartment of the forearm**
110
A: short head of bicep brachii
B: radial nerve
C: brachial artery
D: tricep (long head)
E: musculocutaneous nerve
111
112
capitulum articulates with which bone? [1]
trochlea articualtes with which bone? [1]
capitulum articulates with which bone? [1]
- **radius**
trochlea articualtes with which bone? [1]
- **ulnar**
113
which is the stablilisng bone of the forearm? [1]
which is the moblile bone of the forearm?[1]
which is the stablilisng bone of the forearm? [1]
- **ulnar**
which is the moblile bone of the forearm?[1]
- **radius**
114
115
State which ligaments are found around the elbow joint [2]
Which movements do they help cause movement of? [1]
Ligaments:
- annular ligament
- radial collateral ligament
- ulnar collateral ligaments
together **reinforce hinge movement**
116
which ligament is commonly torn in young girls?
Ulnohumeral joint
Radio humeral joint
Proximal radioulnar joint
why?
which ligament is commonly torn in young girls?
Ulnohumeral joint
Radio humeral joint
**Proximal radioulnar joint**
bc annular ligament if loosely attached to the ulnar in infants
117
What are the 3 joints of the elbow?
**Ulnohumeral joint** is where movement between the ulna and humerus occurs.
**Radio humeral joint** is where movement between the radius and humerus occurs.
**Proximal radioulnar joint** is where movement between the radius and ulna occurs
118
what are the boundaries of the cubital fossa?
_Boundaries of the cubital fossa:_
- **superior border:** line from the lateral to the medial epicondyle
- **flexor muscles** of the forearm and the **bracioradialias** acting as borders also.
119
120
121
**median nerve !**
122
Describe the role of the:
annular ligament [1]
Which joint does it help to create? [1]
Which movements does this joint allow? [2]
**Annular ligament**: encircles the head of the radius and keeps in the radial notch of the ulnar: creates **proximal radioulnar joint**
Permits:**pronation and supination of the formarm**
123
Label 20-22 & A-C
20 Site of humero-ulnar joint
21 Site of humeroradial joint
22 Site of proximal radio-ulnar
A = humerus
B = radius
C = ulna
124
Label 1-3
1: ulnar collateral ligament
2: olecranon
3: radius
125
Which of the following is the median nerve
A
B
C
D
E
Which of the following is the median nerve
A
B
C
D
**E**
126
Which of the following is the radial artery
A
B
C
D
E
Which of the following is the radial artery
**A**
B
C
D
E
127
Which of the following is the ulnar nerve
A
B
C
D
E
Which of the following is the ulnar nerve
A
B
C
**D**
E
128
Which of the following is the ulnar artery
A
B
C
D
E
Which of the following is the ulnar artery
A
B
**C**
D
E
129
Which bones does the radiocarpal joint connect? [3]
What type of joint is it? [1]
**scaphoid & lunate to radius** not the ulna
**condyloid joint** extension and flexion and ulnar and radial devaitation (side to side)
130
what is 1-5?
1 = flexion
2 = extension
3 = adbuction
4 = adduction
5 = oppostion
131
muscles of the superficial layer of forearm:
names? [4]
where do they run from / to?
muscles of the superficial layer of forearm:
1. **Pronator teres** (pronates the arm)
2. **Flexor carpi radialis** (flexes the wrist)
3. **Palmaris longus (small muscle)**
4. **Flexor carpi ulnaris** (flexes the wrist)
**(Pass Fail Pass Fail)**
muscles of the superficial layer do not extend into the digits so they act to
- **flex the wrist
- pronate the arm**
132
which muscle is this?
**palamaris longus**
133
which superficial forearm muscle is this?
palmaris longus
134
Which is the muscle of intermediate layer of forearm?
Where does it run to from the medial epidcondyle?
What movements does it cause? [3]
which is the muscle of intermediate layer of forearm?
* **flexor digitorum superficialis**
where does it run to from the medial epidcondyle?
* **middle phalanx**
Movements:
- flexes the wrist
- flexes the MCP
- flexes the PIP
135
What are deep layer muscles of the forarm? [3] where run to ? what movements?
_flexor digitorum profundus:_
- makes way to fingers and distal phalanx !
- causes flexion of the **wrist, MCP, PIP and DIP joints**
_flexor pollicis longus_
* forearm to distal phalanx of thumb
- **thumb flexion**
_pronator quadratus_
- between ulnar and radius
- **initiates pronation of the forearm**
136
what are ganglion cysts?
- synovial sheath is filled with fluid - get accumulation of fluid = lump
137
Pronation of the forearm is undertaken by pronator quadratus (deep layer) and pronator teres muscle (superficial layer).
which of these is the main muscle involved in pronation and which assists pronation?
p**ronator quadratus (deep layer):** main
**pronator teres muscle (superficial layer):** assists
138
what is the carpal tunnel?
what is the layer at the top called?
which nerve runs through?
- At the base of the palm of the hand, there is a groove/tunnel through which **9 flexor tendons pass.**
- Across the top is the **flexor retinaculum** (thickening of the deep fascia)
- **median nerve runs** through the carpal tunnel
139
what is carpal tunnel syndrome caused by?
what does it present as? a) short term? b) long term?
**compression of the median nerve in the carpal tunnel** (oedema, reptitive strain)
presents as:
i) short term: **numbness of tingling of first 3.5 digits**
ii) long term **muscle wasting away**
140
which tendons are from muscles A & B?
which joints of the fingers are these muscles acting on?
```
A= **flexor digitorum profundus:** all the way to distal phalanx. **PIP &** **DIP flex**
B = **flexor digitorum superficialis:** middle phalanx. **PIP flex**
```
141
name the muscles of the posterior compartent that run laterally and what movements they permit
Brachioradialis: **humurus --\> radius:** only flexes the elbow (as doesnt cross wrist)
extensor carpi radialis longus: **extend and adbuct the wrist**
extensor carpi radialis brevis: **extend and adbuct the wrist**
142
what do these tendons from these muscles cause movement of? [3]
what do these tendons from these muscles cause movement of **the thumb !!**
abductor pollicis longus: **abducts thumb**
extensor pollicis longus & brevis: **extend thumb**
143
What are the borders of the anatomical snuffbox? [3]
abductor pollicis longus, extensor pollicis longus & extensor pollicis brevis
144
lumbricals: **flex MCP**
dorsal interrossei: abduct fingers **(DAB)**
palmar interrossei adduct the fingers (**PAD)**
145
fyi
146
