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Teres major

Other Terms: Teres major muscle, Musculus teres major, Muscle grand rond

Muscle parts

None

Latin name

Musculus teres major

Latin muscle parts

None

Group

Shoulder joint muscle – intertubercular groove group

Etymology

In English, this muscle’s name means the larger round muscle. The Latin word teres means “round or rounded off.” The term major comes from the Latin maior meaning “greater.” As is typical in anatomical terminology, this comparative reference clues you into the fact that this is a larger version of a similar shaped smaller muscle.

Origin

Posterior surface of the inferior angle of the scapula

Insertion

Medial ridge of the intertubercular groove of the humerus.

Action

Medial rotation, adduction, and extension of the humerus – it is important to note, however, that the muscle is not active during any of these movements unless the arm has to overcome resistance. In an unloaded arm no movement at the shoulder joint recruits the teres major.

Nerve supply

Lower subscapular nerve (C5, C6, and C7)

Blood supply

Thoracodorsal artery; circumflex scapular artery; posterior circumflex humeral artery.

Latin

Musculus teres major

French

Muscle grand rond

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