Coracobrachialis muscle
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| Coracobrachialis muscle | ||
|---|---|---|
| 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.) | ||
| Latin | musculus coracobrachialis | |
| Gray's | subject #124 443 | |
| Origin: | coracoid process of scapula | |
| Insertion: | medial humerus | |
| Artery: | brachial artery | |
| Nerve: | musculocutaneous nerve | |
| Action: | adducts humerus | |
| Dorlands/Elsevier | m_22/12548663 | |
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.
Contents |
Origin and insertion
It arises from the apex of the coracoid process, in common with the short head of the Biceps brachii, and from the intermuscular septum between the two muscles.
It is inserted by means of a flat tendon into an impression at the middle of the medial surface and border of the body of the humerus between the origins of the Triceps brachii and Brachialis.
Action
The coracobrachialis draws the humerus forward (shoulder flexion) and towards the torso (shoulder adduction).
Innervation
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.
Additional images
 Left scapula. Costal surface. |
 Left humerus. Anterior view. |
 The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front. |
 The axillary artery and its branches. |
 The brachial artery. |
 The veins of the right axilla, viewed from in front. |
 Nerves of the left upper extremity. |
External links
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 As such, some of the information contained herein may be outdated.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.
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