Brachial Plexus — Roots, Trunks, Cords, Branches
Brachial plexus consists of Roots (C5–T1), Trunks (upper, middle, lower), Divisions (each trunk splits into anterior/posterior), Cords (lateral, posterior, medial), and terminal Branches (musculocutaneous, axillary, radial, median, ulnar). Anatomical course: roots emerge between scalene muscles; trunks in posterior triangle; divisions under clavicle; cords encircle axillary artery and give off named nerves (e.g. lateral cord → musculocutaneous). Key relationships: the long thoracic nerve (C5-7)...
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3Practised by MCQ
10What is the root value of the long thoracic nerve?
mcqWhich nerve is primarily affected in Erb's palsy?
mcqWhich of the following nerves is a terminal branch of the lateral cord of the brachial plexus?
mcqIn a mid-shaft humeral fracture, which nerve is most likely to be injured, leading to wrist drop?
mcqWhat is the primary function of the axillary nerve?
mcqWhich condition is associated with lower trunk injury of the brachial plexus?
mcqWhich of the following is NOT a branch of the posterior cord of the brachial plexus?
mcqWhich part of the brachial plexus is located in the posterior triangle of the neck?
mcqWhat anatomical structure do the cords of the brachial plexus encircle?
mcqWhich nerve is responsible for sensory innervation of the lateral forearm?