Teres major muscle
| Teres major muscle |
|---|
|
| Shoulder muscles with M. teres major |
| origin |
| Lower edge of the scapula ( angulus inferior scapulae ) |
| approach |
| Front of the humerus ( Crista tuberculi minoris humeri ) |
| function |
| Internal rotation, retroversion and adduction of the arm |
| Innervation |
| Subscapular nerve , sometimes also thoracodorsal nerve or axillary nerve |
| Spinal segments |
| C5, C6 |
The teres major muscle ( Latin for "large round muscle" or "large round muscle") is a skeletal muscle of the upper arm . In humans it is on the back of the body, in quadruped mammals on the inside behind the shoulder. The muscle is involved in the formation of the axillary gaps .
In humans, it runs over a common end tendon with the latissimus dorsi muscle through the armpit to the front of the humerus . Between this chord and the bone is a bursa ( Bursa subtendinea musculi teretis majoris ), which serves as a sliding bearing at the approach of the arm. The teres major muscle lies above (cranial) the latissimus dorsi muscle.
function
Due to the course, the muscle can turn the arm inwards (internal rotation), pull it backwards (retroversion) and, if the arm has been moved sideways away from the body, pull it back towards the body ( adduction ).
In quadruped mammals, the muscle acts as a flexor of the shoulder joint and as a retractor of the forelimbs.
Innervation
In humans, the teres major muscle is innervated by the thoracodorsal nerve and / or the subscapularis nerve , and rarely also the axillary nerve. In quadruped mammals it is generally supplied by the axillary nerve.
See also
literature
- Schünke, Schulte, Schumacher (eds.): Prometheus, LernAtlas der Anatomie . 2nd Edition. Georg Thieme Verlag Stuttgart 2009, ISBN 978-3-13-139522-1
- Franz-Viktor Salomon et al. (Ed.): Anatomy for veterinary medicine . 2nd ext. Edition. Enke, Stuttgart 2008, ISBN 978-3-8304-1075-1 .
- Jürgen Fanghänel et al. (Ed.): Waldeyer . Human anatomy. 17th edition. Berlin / New York 2003, ISBN 3-11-016561-9