Coracobrachialis origin and insertion

Coracobrachialis runs from the scapula to the humerus.

What are the origin and insertion of coracobrachialis?

Coracobrachialis arises from the tip of the coracoid process. It inserts on the middle of the medial border of the humerus. Its main action is shoulder flexion. It is supplied by the musculocutaneous nerve (C6, C7). The attachments, actions and nerve follow Gray (1918).

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Every attachment and its bone

Origin 1

Origin of coracobrachialis, with the bone each is on
Attachment	Bone
Tip of the coracoid process	Scapula

Insertion 1

Insertion of coracobrachialis, with the bone each is on
Attachment	Bone
Middle of the medial border of the humerus	Humerus

Actions

The actions of coracobrachialis, and which are its main ones
Action	What moves	Main or assisting
Shoulder flexion	The arm swings forward	Main action
Shoulder adduction	The arm comes down to the side	Assists

Each action is stated in the anatomical position: standing, arms by the sides, palms forward.

Innervation

The musculocutaneous nerve (C6, C7).

Lifts that use coracobrachialis

A prime mover produces the lift’s main joint action against the load; a synergist assists that action, or adds a secondary action the lift needs. Each role is the one the lift’s own page gives, for the technique that page states.

Synergist in 4

Lifts in which coracobrachialis is a synergist, with what it does there
Lift	What it does there
Flat bench press	Shoulder flexion and adduction
Incline bench press	Shoulder flexion and adduction
Push-up	Shoulder flexion and adduction
Parallel-bar dip	Shoulder flexion

Sources

Gray (1918), Myology, the muscles and fasciae of the arm

Each lift role is from that lift’s page in muscles worked by exercise, which names the sources it follows.

See it in 3D

Visualiser · Biology Muscle Origin, Insertion and Action Explorer Paint a muscle’s origin and insertion on real 3D bones, or click a bone to see what attaches to it. Visualiser · Biology Upper Limb Muscles Explorer 114 upper limb muscle meshes, by compartment. Visualiser · Biology Muscles Worked by Exercise 3D Explorer Choose a lift and a real body lights its prime movers, synergists and stabilisers, front and back, with the same muscles in 3D.