Clavicular part of deltoid muscle

Origin

The clavicular part originates from the anterior border of the lateral one-third of the clavicle.

Insertion

The fibers converge with the other parts of the deltoid to form a thick tendon, which inserts into the deltoid tuberosity on the humerus.

Arterial Supply

Primarily supplied by the posterior circumflex humeral artery.

Innervation

The axillary nerve, derived from the fifth and sixth cervical spinal roots (C5, C6), provides the innervation.

Actions

• The clavicular part primarily contributes to flexion and medial (internal) rotation of the arm.

• This portion also assists in arm abduction, working in coordination with the acromial and scapular parts.

Structure

The clavicular fibers are arranged in a unipennate pattern, converging obliquely backward and laterally, which supports both mobility and stability during shoulder movements.