Teres major muscle
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| Teres major muscle | ||
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| Muscles on the dorsum of the scapula, and the Triceps brachii muscle: #3 is Latissimus dorsi muscle #5 is Teres major muscle #6 is Teres minor muscle #7 is Supraspinatus muscle #8 is Infraspinatus muscle #13 is long head of Triceps brachii muscle |
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| Surface anatomy of the back. (label for Teres major at upper right.) | ||
| Latin | musculus teres major | |
| Gray's | subject #123 442 | |
| Origin: | posterior aspect of the inferior angle of the scapula | |
| Insertion: | medial lip of the intertubercular sulcus of the humerus | |
| Artery: | Subscapular and circumflex scapular arteries | |
| Nerve: | Lower subscapular nerve (segmental levels C5 and C6) | |
| Action: | Internal rotation of the humerus | |
| Dorlands/Elsevier | m_22/12551115 | |
Teres major is a muscle of the upper limb and one of six scapulohumeral muscles. It is a thick but somewhat flattened muscle.
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[edit] Origin and insertion
It arises from the oval area on the dorsal surface of the inferior angle of the scapula, and from the fibrous septa interposed between the muscle and the Teres minor and Infraspinatus
The fibers are directed upward and lateralward, and end in a flat tendon, about 5 cm. long, which is inserted into the crest of the lesser tubercle of the humerus.
[edit] Relations
The tendon, at its insertion, lies behind that of the Latissimus dorsi, from which it is separated by a bursa, the two tendons being, however, united along their lower borders for a short distance.
[edit] Action
The Teres major assists the Latissimus dorsi in drawing the previously raised humerus downward and backward, and in rotating it inward; when the arm is fixed it may assist the Pectorales and the Latissimus dorsi in drawing the trunk forward.
[edit] Additional images
 Left scapula. Dorsal surface. |
 Left humerus. Anterior view. |
 Muscles connecting the upper extremity to the vertebral column. |
 Deep muscles of the chest and front of the arm, with the boundaries of the axilla. |
 The scapular and circumflex arteries. |
 The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front. |
 Suprascapular and axillary nerves of right side, seen from behind. |
 The suprascapular, axillary, and radial nerves. |
[edit] External links
[edit] See also
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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