Axilla and Brachial Plexus Flashcards
What are the arteries of the proximal upper limb?
Subclavian
Axillary
Brachial
What forms the brachial plexus?
ventral rami of C5-T1spinal nerves
What does the brachial plexus supply?
The structures of the upper limb
every muscle of the upper limb receives its own nerve supply from a branch of the brachial plexus
Where do the roots of brachial plexus emerge?
Between anterior and Middle scalene
Robert Taylor Drinks Cold Beer (Order of Branches )
Roots,Trunks, Divisions,Cords,Terminal Branches
How many are in each section?
5 roots
3 trunks
3 anterior division 3 posterior divisions
3 cords
then terminal branches
Name the 5 Ventral rami
C5
C6
C7
C8
T1
What are the three trunks?
superior middle inferior
Name the 5 terminal branches
Radial Nerve
Median Nerve
Ulnar Nerve
Axillary Nerve
Musculocutaneous Nerve
What are Collateral branches?
Nerves that arise from the brachial plexus prior to the terminal branches
They arise from the roots, trunks, and cords of the plexus
What do collateral branches innervate?
Muscles of the scapular region
What are nerves located superior and inferior to the clavicle called?
Supraclavicular nerve
infracclavicular nerve
What muscles does the MusculoCutaneious nerve innervate?
The anterior arm- Biceps, Brachii, coracobrachialis, brachialis
What muscles does the Median nerve innervate?
Most of anterior forearm- wrist and finger flexors-except flexor carpi ulnaris.
The thumb muscles
2 lateral lumbricals
What muscles does the Ulnar nerve innervate?
Most of hand; one muscle in the anterior forearm( the flexor carpi ulnaris)
What muscles does the Radial nerve nerve innervate?
Posterior arm- Triceps, brachii, anconeus
posterior forearm- (wrist and finger extensors)
What muscles does the Axillary nerve innervate?
Deltoid and teres minor
What is the advantage to the arrangement of the nerves in the plexus?
The nerves supplying muscles of the extremities are carrying neurons from more than one spinal cord level- so damage to one segment wont result in complete loss in any one muscles
also with so many muscles in UE the spinal cord would need to be super long to supply them with nerves
Where does the axillary nerve wrap ?
The nerve wraps around the surgical neck of the humerus
Where does the radial nerve run?
It runs in the radial groove in the mid shaft of the humerus
