Teres Major

Summary

Origins

• Posterior surface of inferior angle of 🦴 scapula
• Lower one third of lateral border of 🦴 scapula
• Blends with the deep surface of latissimus dorsi via the thoracolumbar fascia

Insertions

• Medial lip of intertubercular (bicipital) sulcus of 🦴 humerus

Actions

• Extends the shoulder
• Adducts the shoulder
• Medially rotates the shoulder

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Etymology

The term "teres major" refers to a muscle in the upper limb, specifically located in the shoulder area. The etymology of "teres major" comes from Latin:

• "Teres" means "round" or "smooth," indicating the shape of the muscle.
• "Major" means "greater" or "larger," distinguishing it from the "teres minor" muscle, which is smaller and has a different function.

So, "teres major" essentially translates to "the larger round muscle." This muscle is involved in the movement of the shoulder and the upper arm, specifically aiding in actions such as internal rotation, adduction, and extension of the humerus.

References

• Wikipedia
• Teres Minor
• Gf, 162–63