2026 gross anatomy topic 17

axilla and brachial plexus

what is the anterior wall of axilla?

pectoralis major and minor mm

what is the posterior wall of axilla?

scapula, subscapularis mm, inferiorly by teres major and lattisimus dorsi mm

what is the medial wall of axilla?

serratus anterior mm overlaying thoracic wall

what is the lateral wall of axilla?

intertubercular groove of humerus

what is the base of the axilla?

concave skin and axillary fascia

what is the apex of the axilla?

cervicoaxillary canal (1st rib, clavicle, superior edge of scapula)

what are the spinal levels of the brachial plexus?

c4-t1

the brachial plexus is divided into what?

roots, divisions, trunks, cords, and terminal branches

which nerve comes from c5 root?

dorsal scapular

what nerves comes from the c5 and c6 superior trunk?

n. to subclavius and suprascapular

what nerve comes from the lateral cord?

lateral pectoral n, musculocutaneous n, lateral antibrachial cutaneous n, and the median nerve

what nerve comes from c5, c6, and c7 roots?

long thoracic

the middle trunk comes from what spinal root?

c7

the superior trunk comes from what spinal root?

c5 snd c6

the inferior trunk comes from what spinal root?

c8 and t1

what nerves come from the posterior cord?

upper subscapular, thoracodorsal, lower subscapular, axillary, and radial

what nerves come from the medial cord?

medial pectoral n, medial brachial cutaneous n, medial antibrachial cutaneous n, median n, and ulnar n