Limbs overview Flashcards
1
Q
Skeleton components
A
-made of axial skeleton (skull, vertebral column and thoracic cage) and appendicular skeleton (limbs)
2
Q
Limb development
A
NERVE SUPPLY:
- upper limbs supplied by C5-T1
- lower limbs supplied by L2-S3
FLEXORS AND EXTENSORS:
- in the upper limb, the flexors are anterior and the extensors are posterior
- the lower limbs rotate internally so the extensors are anterior and the flexors are posterior
3
Q
Internal rotation of the developing lower limb
A
- lower limb undergoes permanent pronation (internally rotates) during development
- results in twisting of the dermatome fields=twisted oblique fields as opposed to straighter fields in the upper limb
- in the thigh and leg, the extensors are anterior and the flexors are posterior
4
Q
Limb compartments
A
- tend to have distinct function
- tend to have same nerve supply
- tend to have same blood supply
5
Q
Compartments of the upper limb
A
- pectoral girdle muscles (anterior and posterior)
- intrinsic shoulder muscles
- anterior arm muscles
- posterior arm muscles
- anterior forearm muscles
- posterior forearm muscles
- intrinsic hand muscles (palmar and dorsal surface)
6
Q
Pectoral girdle
A
- shoulder movement involves both arm movements relative to the scapula at the shoulder joint and scapula movements relative to the chest wall
- muscles acting on shoulder joint have attachments in neck, anterior chest, back and arm
7
Q
Compartments of the lower limb
A
- hip abductors (gluteal)
- hip extensors (gluteal)
- hip flexors
- anterior thigh muscles (extensors)
- medial thigh muscles (adductors)
- posterior thigh muscles (flexors)
- anterior leg muscles (extensors)
- lateral leg muscles (foot evertors)
- posterior leg muscles (flexors)
- intrinsic foot muscles
8
Q
Muscles and nerves of the lower limb
A
- arise in abdominal and pelvic cavities
- muscles with attachments in abdomen and pelvis are flexors of hip (iliacus and psoas)
- nerves supplying lower limb arise from lumbosacral plexus (L2-S3)=femoral nerve, sciatic nerve
9
Q
Upper limb arterial supply
A
FROM HEART TO HAND
- Aorta
- Subclavian artery
- Axillary artery
- Brachial artery (pulse point) including deep brachial artery
- Ulnar and radial arteries (pulse points)
- Hand palmar arches (deep and superficial)
- Metacarpal and digital arteries
10
Q
Upper limb venous drainage (superficial and deep systems)
A
FROM HAND TO HEART
- Dorsal venous arch (superficial)
- Cephalic and basilic veins (superficial)
- Venae comitantes (deep)
- Axillary vein (deep)
- Subclavian vein
- Superior vena cava
11
Q
Superficial veins in cubital fossa
A
- superficial veins in cubital fossa region commonly used for phlebotomy or venous line insertion
- median cubital vein (links cephalic and basilic veins) not always present
12
Q
Lower limb arterial supply////////
A
FROM PELVIS TO FOOT
- Aorta
- Common iliac arteries (internal and external)
- External iliac artery
- Femoral artery (pulse point) to deep femoral
- Popliteal artery (pulse points) to posterior tibial artery, anterior tibial artery, peroneal artery and dorsalis pedis artery
13
Q
Lower limb venous drainage
A
DEEP SYSTEM -anterior and posterior tibial venae comitantes -popliteal vein -femoral vein -external iliac vein SUPERFICIAL SYSTEM -venous arches -long (great) saphenous vein -short (small) saphenous vein
14
Q
Superficial veins of lower limb
A
- great and small saphenous veins arise from venous network of dorsum of foot
- great saphenous vein drains into femoral vein at groin
- small saphenous vein drains into popliteal vein at popliteal fossa
-saphenous veins are consistent but other superficial veins are more variable
15
Q
Femoral triangle
A
- region of the grain where femoral artery can be accessed (cardiac vessel access to carry out angiograms and angioplasty)
- pulse point of femoral artery
16
Q
Varicose veins
A
- perforating veins connect superficial and deep veins
- perforating veins contain a valve that will allow flow only from superficial to deep
- compromised valve means blood is pushed from deep to superficial veins, resulting in varicose veins
17
Q
Surgical socks
A
- valves in veins allow flow only up towards heart
- deep vessels in legs are sandwiched between calf muscle layers
- during exercise (walking and running ), contraction of calf muscles squeezes thin-walled veins and pushes blood up the veins (CALF PUMP)
- immobility (post-surgery) means less efficient venous return from foot and leg
- sluggish deep venous return results in DVT
- elastic surgical socks compress superficial veins to promote more vigorous deep venous return
18
Q
Spinal nerve anatomy
A
- 8 cervical
- 12 thoracic
- 5 lumbar
- 5 sacral
- 1 or 2 coccygeal
19
Q
Spinal nerve organisation
A
C1-4=neck C5-T1=upper limb T2-L1=trunk L2-S3=lower limb S2-C2=perineum
20
Q
Brachial plexus
A
/
21
Q
Lumbosacral plexus
A
Nerves supplying lower limb emerge from lumbosacral plexus
- femoral nerve supplies anterior compartment of thigh
- obturator nerve supplies medial compartment of thigh
- sciatic nerve (or tibial and common peroneal nerves) supplies the remaining compartments
22
Q
Segmental motor supply
A
-groups of motor nerve cell bodies in the spinal cord
23
Q
Segmental supply principles
A
- muscles supplied by 2 adjacent segments
- same action on a joint means same nerve supply
- opposing muscles have nerves 1-2 segments above or below each other
- more distal muscles in limb=nerves originate more caudal in the spine (near tail)
24
Q
Upper limb segmental motor supply
A
SHOULDER -abduction=C5 -adduction-C6,C7,C8 -external rotation=C5 -internal rotation=C6,C7,C8 ELBOW -flexion=C5,C6 -extension=C7,C8 FOREARM -supination=C6 -pronation=C7,C8 WRIST -flexion=C6,C7 -extension=C6,C7 LONG TENDONS TO HAND -flexion=C7,C8 -extension=C7,C8 INTRINSIC HAND -T1
25
Lower limb segmental motor supply
```
HIP
-flexion=L2,L3
-extension=L4,L5
KNEE
-extension=L3,L4
-flexion=L5,S1
ANKLE
-dorsiflexion=L4,L5
-plantarflexion=S1,S2
```
26
Upper limb sensory segmental supply
```
C4=infraclavicular region
C5=lateral arm
C6=lateral forearm and thumb
C7=middle finger
C8=medial side of hand, forearm and little finger
T1=medial arm
T2=axilla and trunk
T4=nipple
T10=umbilicus
T12=lower abdomen
```
27
Lower limb sensory segmental supply
/
28
Nerve function assessment
1) motor function
2) sensory function
3) reflex function
4) autonomic function
29
Root injury (prolapsed intervertebral disc at L5/S1)
1) motor=loss of eversion
2) sensory=loss of sensation on outer border of foot
3) reflex=loss of ankle jerk (S1)
4) autonomic=minimal
30
Lesion of common peroneal nerve at fibular neck
1) motor=foot drop
2) sensory=dorsum of foot at least
3) reflex=non
4) autonomic=minimal
31
Compartment syndrome
- muscle groups in confined compartments separated by fibrous septa
- syndrome is ischaemia caused by trauma-induced increased pressure in a confined limb compartment
- commonly affects anterior, posterior and lateral compartments of leg
- normal pressure (25 mmHg), and only need 50-60 mmHg to collapse vessels and cause ischaemia=but pulse still present
- acute compartment syndrome is trauma associated
- chronic compartment syndrome is exercise-induced
- emergency fasciotomy required to prevent muscle and tissue death in affected compartment
32
Gluteal safe area
- for intramuscular injections into gluteus medius
- in the buttock, the muscles have a greater blood supply so drug uptake is often faster than subcutaneous and sub-dermal injections
- intramuscular injections into buttock often contraindicated due to proximity to major vessels and nerves and the variation in adipose tissue over the muscles
33
Venae comitantes
-pair of veins (or more) that closely accompany an artery in such manner that the artery pulsations aid venous return
