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Coracobrachialis

Other Terms: Pirogoff's aponeurosis, Musculus coracobrachialis, Muscle coraco-brachial

Muscle parts

None

Latin name

Musculus coracobrachialis

Latin muscle parts

None

Group

Brachial muscle – anterior compartment

Etymology

In English, this muscle’s name is the crow arm muscle. What does this odd translation of the Latin mean? Let’s examine this in a little more detail to clarify. The term coraco- in the muscle’s name is from the Greek corax meaning “raven or crow.” The ancient anatomist Galen thought that the anterior projection of the scapula, called the coracoid process, resembled a raven or crow perched on a branch, so he referred to it as the crow-like process. This muscle arises from this crow-like process and annexes the term as part of its name. The brachialis portion of the name refers to the fact that it courses into and ends in the brachium from the Latin term brachium, which derives from the Greek brachion meaning “arm,” in reference to the region of the upper limb between the shoulder and the elbow.

Origin

Coracoid process of the scapula

Insertion

Medial surface of mid-humeral shaft

Action

Flexion of the humerus – the muscle is most effective when the arm is extended and it also draws the arm somewhat medially as it flexes.

Nerve supply

Musculocutaneous nerve (C6 and C7)

Blood supply

Small muscular branches from the axillary artery and brachial arteries; anterior circumflex humeral artery.

Latin

Musculus coracobrachialis

French

Muscle coraco-brachial

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