Upper Limb Nerves Flashcards
Axillary nerve roots
C5-6
Axillary nerve sensory function
lower deltoid “regimental badge area”
Where does the axillary nerve exit the axilla?
Posteriorly via the quadrangular space
Which muscles are innervated by the axillary nerve?
Teres minor
Deltoid
Musculocutaneous nerve roots
C5-C7
Muculocutaeous nerve sensory function
Gives rise to lateral cutaneous nerve - innervates skin on lateral surface of forearm.
Musculocutaneous nerve motor function
“BBC”
Biceps, brachialis, coracobrachialis
Which cord of the brachial plexus does the MCN arise from?
Lateral cord
Which muscles does the MCN travel between?
Anterior to brachialis, deep to biceps
Which nerve roots form the median nerve?
C5-T1
Median nerve motor function
Flexors of anterior forearm, except FCU and medial half of FDP.
Thenar eminence.
Lateral 2 lumbricals
Median nerve sensory function
Palmar cutaneous branch: lateral palm
Digital cutaneous branch: lateral 3 1/2 digits on palmar surface
What is carpal tunnel syndrome?
Compression of the median nerve within the carpal tunnel
What type of fracture risks the median nerve?
Supracondylar
Which cords make up the median nerve?
Medial and lateral
Radial nerve roots
C5-T1
Radial nerve sensory function
Skin of posterior forearm, dorsal palm (lateral side and lateral 3 1/2 digits)
Radial nerve motor function
Triceps
Extensor muscles in forearm
Which cord does the radial nerve arise from?
Posterior
How does the radial nerve descend the arm?
Along the radial groove of the humerus
Ulnar nerve roots
C8-T1
Ulnar nerve motor function
Intrinsic hand muscles except thenar eminence and lateral lumbricals. FCU, medial half of FDP
Ulnar nerve sensory function
Anterior and posterior one and a half fingers and associated palm area
Which cord does the ulnar nerve arise from?
Medial cord
Where does the ulnar nerve pass at the elbow?
Posterior to the medial epicondye
How does the ulnar nerve enter the hand?
Superficial to flexor retinaculum, within ulnar canal
