Neuro Supply of the Upper Limb 1 Flashcards
which anterior (ventral) rami form the brachial plexus?
C5-T1
what are the components of the brachial plexus?
Roots (C5-T1)
Trunks (roots merge to form 3 trunks –> Superior, Middle and Inferior)
Divisions (trunks separate into divisions –> ant. and post.)
Cords (divisions unite to form cords –> Lateral, Posterior and Medial)
Branches (terminal branches arise from cords)
what roots supply the musculocutaneous nerve
C5, C6, C7
what roots supply the axillary nerve
C5, C6
what roots supply the radial nerve
C5, C6, C7, C8, T1
what roots supply the median nerve
C5, C6, C7, C8, T1
what roots supply the ulnar nerve
C8, T1
what root innervates the shoulder to perform abduction and flexion
C5
what root innervates the shoulder to perform adduction and extension
C6, C7
what root innervates the elbow to perform flexion
C5, C6
what root innervates the elbow to perform extension
C7, C8
what root innervates the wrist to perform flexion
C6, C7
what root innervates the wrist to perform extension
C6, C7
which nerve pierces the coracobrachialis?
musculocutaneous
explain the course of the axillary nerve
travels posterior to the axillary artery –> exits via the quadrangular space with the posterior circumflex humeral artery
what nerve can be damaged due to a displaced fracture of the humeral neck?
axillary nerve
explain the course of the musculocutaneous nerve
ARM: travels laterally to the axillary artery –> pierces the coracobrachialis –> travels between the biceps brachii and the brachialis
CUBITAL FOSSA: changes name to the lateral cutaneous nerve of the forearm
