Flashcards in 2. nerve and blood supply to upper limb Deck (32)
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1
stem (main) artery
subclavian artery
right - from brachiocephalic trunk
left - from arch of aorta
2
subclavian artery path
passes through scalene triangle (over first rib)
divided into 3 parts by scalenus anterior
1st: medial to muscle
2nd: behind muscle
3rd: lateral to muscle
becomes axillary artery
3
dorsal scapular artery
from 2nd/3rd part of subclavian
contributes to scapular anastomosis
4
thyrocervical trunk
from first part of subclavian artery
contributes to scapula anastomosis
5
when does subclavian become axillary artery?
as it crosses outer border of first rib
6
axillary artery
divided into 3 parts by pectoralis major
1st: medial to muscle
2nd: behind muscle
3rd: lateral to muscle
ends at lower part of teres major
becomes brachial artery
7
branches of axillary
subscapular artery - to scapular anastomosis
anterior/posterior circumflex humeral - to neck/shaft of humerus
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brachial artery
superficial
supplies flexors
contributes to anastomosis around elbow
terminates in cubital fossa: ulnar and radial
large branch = profunda brachia artery (supplies extensors)
9
profunda brachii artery
branch of brachial
accompanies radial nerve in spiral groove
supplies arm extensors (triceps)
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radial artery
lateral side of forearm
smaller of the 2 terminal branches
covered by brachiradialirs
forms deep palmar arch
winds around dorsum of hand at wrist
passes through anatomical snuffbox
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ulnar artery
medial side of forearm
covered by flexor carpi ulnaris muscle
gives off deep branch - common interosseous artery
forms superficial palmar arch
12
deep veins
paired - run which arteries of same name
venae comitantes
drain into axillary vein
13
superficial veins
cephalic
basilic
drain into axillary vein
connected by median cubital vein at elbow
14
brachial plexus
nerve supply to upper limb
mixed nerves
divided into roots, trunks, divisions and cords
15
roots
ventral primary rami of C5-T1
motor axons within each root innervate different functional group of muscles
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c5 root
shoulder abduction and adduction
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c6/c7 roots
elbow flexion and extension
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c7/c8 roots
wrist flexion and extension
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c8/t1 roots
movement of digits
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trunks
from roots
pass through scalene muscles
superior (C5, C6)
middle (C7)
inferior(C8, T1)
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divisions
from trunks
each trunk divides into anterior and posterior divisions
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anterior divisions
axons to flexor compartments
forms lateral and medial cords
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posterior divisions
axons to extensor compartments
forms posterior cord
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cords
under pectoralis major
cord named in relation axillary artery
lateral
posterior
medial
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terminal branches of lateral cord
musculocutaneous nerve
lateral part of median nerve
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musculocutaneous nerve
motor to anterior arm
sensory to lateral forearm
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terminal branches of medial cord
medial part of median nerve
ulnar nerve
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median nerve
motor to anterior forearm and lateral hand
sensory to lateral palm, d1, d2, d3 and 1/2 d4
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ulnar nerve
motor to medial side anterior forearm and hand
sensory to medial hand and 1/2 d4, d5
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