|Deep muscles of the chest and front of the arm, with the boundaries of the axilla. Coracobrachialis is shown in blue.|
|Front of right upper extremity. (Coracobrachialis labeled at right, fourth from the bottom.)|
|Gray's||subject #124 443|
|Origin:||coracoid process of scapula|
The Coracobrachialis is the smallest of the three muscles that attach to the coracoid process of the scapula. (The other two muscles are pectoralis minor and biceps brachii.) It is situated at the upper and medial part of the arm.
It is perforated by and innervated by the musculocutaneous nerve.
Origin and insertion
The coracobrachialis draws the humerus forward (shoulder flexion) and towards the torso (shoulder adduction).
The coracobrachialis muscle is innervated by the musculocutaneous nerve which arises from the anterior division of the upper (C5, C6) & middle trunks (C7) of the brachial plexus.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.