Scapulohumeral muscles
Scapulohumeral muscles are a group of muscles that connect the scapula and the humerus. They are responsible for the movement of the upper limb. The group includes four muscles: the deltoid, the supraspinatus, the infraspinatus, and the teres major.
Etymology[edit | edit source]
The term "scapulohumeral" is derived from the Latin words "scapula," meaning shoulder blade, and "humerus," meaning upper arm bone.
Anatomy[edit | edit source]
The scapulohumeral muscles originate from the scapula and insert into the humerus. They are responsible for various movements of the upper limb, including abduction, adduction, flexion, extension, and rotation.
Deltoid[edit | edit source]
The deltoid is a large, triangular muscle that covers the shoulder joint. It is responsible for the abduction of the arm at the shoulder joint.
Supraspinatus[edit | edit source]
The supraspinatus is a small muscle that sits in the supraspinous fossa of the scapula. It assists the deltoid in the abduction of the arm.
Infraspinatus[edit | edit source]
The infraspinatus is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. It is responsible for the lateral rotation of the arm.
Teres Major[edit | edit source]
The teres major is a thick and ovoid muscle in the upper arm. Despite its name, it is not part of the rotator cuff. It is a powerful adductor, internal rotator, and extensor of the arm.
Related Terms[edit | edit source]
See Also[edit | edit source]
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Contributors: Prab R. Tumpati, MD