Deltoid – Functional Anatomy

Deltoid

 

Deltoid is a triangular muscle that works closely with the rotator cuff muscles to lift the humeral shaft superiorly. It is also key in preventing dislocation of the humerus when lifting heavy loads.

All bellies

Origin – lateral third of the clavicle, acromion and spine fo the scapula

Insertion – deltoid tuberosity of the humerus

Function – abduction of the humerus, strongest in slight medial rotation

Anterior

Origin – lateral third of the clavicle

Insertion – deltoid tubercle of the humerus

Function – horizontal flexion of the humerus, assists with medial rotation

Middle

Origin – acromion of the scapula

Insertion – deltoid tubercle of the humerus

Function – abduction of the humerus

Posterior

Origin – spine of the scapula

Insertion – deltoid tubercle of the humerus

Function – extends the humerus when it is in horizontal flexion (in front of the body), also assists in external rotation of the humerus

Wikipedia entry for deltoid.

schedule-a-session-5


Tony Preston has a practice in Atlanta, Georgia where he sees clients.

He has written and taught about anatomy, trigger points and cranial therapies since the mid-90s.

Question? Comment? Typo?
The Body Guild.org
(404) 226-1363
tony@thebodyguild.org