It originates from the coracoid process of the scapula; it inserts onto the middle of the medial aspect of the body of the humerus.

Coracobrachialis muscle arises from the (deep surface of the) apex of the coracoid process of the scapula (a common origin with the short head of the biceps brachii[1][2]).

It additionally also arises from the proximal portion of tendon of origin of the biceps brachii muscle.

Common causes of injury include chest workouts or activities that require one to press the arm very tight towards the body, e.g. work on the rings in gymnastics.

[10] This article incorporates text in the public domain from page 443 of the 20th edition of Gray's Anatomy (1918).