Deltoid

Original Editor - Wendy Walker

Lead Editors - Lucinda hampton, Sai Kripa, Wendy Walker, Naomi O'Reilly, Joao Costa, Chrysolite Jyothi Kommu, Andeela Hafeez, Kim Jackson, Vidya Acharya, WikiSysop, Wanda van Niekerk, Aminat Abolade, Admin, Evan Thomas, George Prudden and Uchechukwu Chukwuemeka  

Description

The Deltoid muscle is a large triangular shaped muscle which lies over the glenohumeral joint and which gives the shoulder its rounded contour. It is named after the Greek letter delta, which is shaped like an equilateral triangle. It comprises 3 distinct portions each of which produces a different movement of the glenohumeral joint, commonly named the anterior, mid (or lateral) and posterior heads.

Origin

Anterior fibres/head

Lateral third, anterior surface of the clavicle (close to the lateral fibres of pectoralis major).

Mid/lateral head

Acromion process, superior surface.

Posterior head

Spine of the scapula, posterior border.

Insertion

Fibres from all heads converge to insert into the deltoid tuberosity on the humerus.

The deltoid fascia is continuous with the brachial fascia and connects to the medial and lateral intermuscular septa.

References

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