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Teres Major
Region: Shoulder & Arm Muscles · All shoulder & arm muscles
Teres Major at a glance
| Origin | Lower part of the lateral border and inferior angle of the scapula (back surface) |
|---|---|
| Insertion | Medial lip of the intertubercular groove of the humerus |
| Actions | Extends the arm; Adducts the arm; Rotates the arm inward |
| Nerve supply | Lower subscapular nerve (C6–C7) |
◆ Good to know
Sometimes called 'lat's little helper' because it shares the actions of latissimus dorsi — but it inserts on the humerus from the scapula, not the trunk.
More Shoulder & Arm Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.