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 1 Origin and insertion 2 Action 3 Innervation 4 Additional images 5 External links

[edit] 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.

[edit] Action

The coracobrachialis draws the humerus forward (shoulder flexion) and towards the torso (shoulder adduction).

[edit] 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.

[edit] 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.

[edit] External links

• LUC cora
• -758120371 at GPnotebook
• PTCentral

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 As such, some of the information contained herein may be outdated.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.

v • d • e List of muscles of upper limbs VERTEBRAL COLUMN trapezius - latissimus dorsi - rhomboid (major, minor) - levator scapulae THORACIC WALLS pectoralis major - pectoralis minor - subclavius - serratus anterior SHOULDER deltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major ARM anterior compartment: coracobrachialis - biceps brachii - brachialis posterior compartment: triceps brachii - anconeus FOREARM anterior compartment: superf. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis anterior compartment: deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus posterior compartment: superf. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris posterior compartment: deep - supinator - anatomical snuff box (abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus) - extensor indicis HAND lateral volar - thenar (opponens pollicis, flexor pollicis brevis, abductor pollicis brevis) - adductor pollicis medial volar - hypothenar (opponens digiti minimi, flexor digiti minimi brevis, abductor minimi digiti) - palmaris brevis intermediate - lumbrical - interossei (dorsal, palmar)