Anatomy for MRCEM primary exam

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Upper limb Anatomy

Coracobrachialis muscle

Actions & innervation of Coracobrachialis.

Knowledge of origins & insertions is NOT required but an appreciation of the surface topography is required.

OriginCoracoid process of scapula
InsertionAntero-medially on Shaft of Humerus
Nerve supplyMusculocutaneous nerve
ActionsFlexion of the arm and weak adductor

Though the curriculum says origin and insertion not required, we’ve included them as that knowledge will help you understand the movements better based on muscle orientation.

Coracobrachialis muscle Origin and Insertions

Coracobrachialis muscle Origin and Insertions – Image modified from BodyParts3D, © The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan

The muscle is named as per it’s origin and insertion. From coracoid to the arm (Brachium = Arm) hence Coraco-brachialis.

The position of muscle should help you understand the actions when it contracts. It’ll pull the arm anteriorly (flexion) and medially (adduction)

All the anterior arm muscles – Coracobrachialis, Brachialis and Biceps brachii are supplied by the same nerve – The Musculocutaneous nerve, the terminal branch of the lateral cord of the brachial plexus (C5-C7). The nerve becomes lateral cutaneous nerve of forearm to supply lateral part of forearm. Muscles of Upper Arm and Skin of Forearm are supplied.

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