Anatomy (Arm and Elbow - 11/4) Flashcards Preview

Skin MS: Week 2 > Anatomy (Arm and Elbow - 11/4) > Flashcards

Flashcards in Anatomy (Arm and Elbow - 11/4) Deck (53)
Loading flashcards...
1

Dermatomes
C5
C6
C7
C8

C5 Shoulder
C6 Thumb
C7 Middle Finger
C8 Little Finger

2

Dermatomes
T4
T10

T4 - Nipple
T10 - Umbilicus

3

Dermatomes
L1
L5
S1
S2,3,4

L1 - Groin
L5 - Medial Foot
S1 - Lateral Leg/Foot
S2,3,4 - Anal Area

4

Myotomes
C5
C6
C7
C8/T1

C5 - UE Abduction
C6 - Flexion of arm/forearm
C7 - Extension of forearm
C8/T1 - Intrinsic hand muscles

5

Myotomes
L2
L3,4
S1
L5
S1,2

L2 Flex thigh
L3,4 Extend leg
S1 Flex leg
L5 dorsiflexes foot
S1,2 Plantar flexes foot

6

What lies in intertubercular sulcus?

Long head of biceps

7

What does capitulum articulate with?

Head of radius
- lateral side

8

What does trochlea articulate with?

Trochlear notch of ulna
- medial side

9

What moves into coronoid fossa with flexion of forearm?

Coronoid process (front of ulna)

10

What moves into radial fossa with flexion of forearm?

Head of radius

11

Medial epicondyle = origin site for

flexor muscles of forearm/head

12

Lateral epicondyle = origin site for

extensor muscles of hand

13

Radial groove (location and what's there)

Posterior surface of humerus - radial nerve and deep brachial vessels

14

Olecranon fossa

posterior side of distal humerus, olecranon process of ulna there on extension of forearm

15

Ulnar nerve

Derived from medial cord --> continues through arm region --> passes posterior to medial epicondyle ("funny bone")

16

Brachial fascia

Surrounds muscles, blood vessels, nerves of arm

17

Medial and lateral intermuscular septae

Extend inward from brachial fascia --> attach to humerus --> divide arm into anterior flexor compartment and posterior extensor compartment

18

Triceps brachii

Long head: Infraglenoid tubercle (scapula) - long w/ tendon, more medial
Lateral head: Posterior surface of humerus lateral to radial groove - most lateral
Medial head: Medial to radial groove Under them (deep)

*To olecranon process of ulna
Extend forearm, extend/adduct arm
Radial nerve

19

When cut lateral head of triceps diagonally near radial groove, see:

Medial head of triceps, radial nerve w/ deep brachial artery

20

Biceps brachii

Long head: Supraglenoid tubercle of humerus
Short head: Coracoid process of scapula

Tendon inserts on radial tuberosity + Bicipital aponeurosis

Innervated by musculocutaneous nerve

Flex forearm, supinate

21

Coracobrachialis

Superiorly - coracoid process, inferiorly on humerus at midpoint on medial side
Musculocutaneous nerve (also passes through to lie between biceps/brachialis muscles it also innervates)
Flex, adduct arm

22

Rupture of Tendon of Long head of biceps

Tendon tears with forceful flexion of arm against excessive resistance --> popeye deformity

23

Brachialis

Anterior lower half of humerus --> coronoid process/tuberosity of ulna
Musculocutaneous nerve
Flexes forearm

24

Pathway of musculocutaneous nerve

From Lateral cord --> Passes through coracobrachialis --> distally lying on brachialis muscle, covered by biceps brachii --> exits lateral border of biceps and continues into forearm as lateral cutaneous nerve of the forearm (lateral antebrachial cutaneous nerve)

25

Pathway of radial nerve

Passes through posterior compartment of arm through lateral intermuscular septum to lie beneath brachioradialis muscle --> superficial branch (sensory) under brachioradialis to dorsum of hand, and deep branch that pierces supinator muscle to reach posterior forearm - extensors

26

Cubital fossa

Triangular space defined by imaginary line between medial/lateral epicondyles, brachioradialis, pronator teres muscle
Cicipital aponeurosis/deep fascia = roof, brachialis + supinator muscles = floor

27

Brachial artery

Begins at lateral border of teres major muscle (continues from axillary artery)
Accompanies median nerve in arm
3 major branches-->
1. Deep brachial artery
2. Superior ulnar collateral artery
3. Inferior ulnar collateral artery

28

Deep brachial artery

1st branch of brachial artery
Passes posteriorly and accompanies radial nerve in radial groove

29

Superior ulnar collateral artery

2nd brach of brachial artery
Accompanies ulnar nerve and passes behind medial epicondyle

30

Inferior ulnar collateral artery

3rd (smallest) brach of brachial artery
Supplies area of elbow joint and anastomoses with recurrent branches of ulnar/radial arteries