Rhomboid major muscle
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| Rhomboid major | ||
|---|---|---|
| Muscles connecting the upper extremity to the vertebral column. (Rhomboideus major visible at upper center right, near shoulder.) | ||
| Latin | musculus rhomboideus major | |
| Gray's | subject #121 434 | |
| Origin: | spinous processes of the T2 to T5 vertebrae | |
| Insertion: | medial border of the scapula, inferior to the insertion of rhomboid minor muscle | |
| Blood: | Both rhomboid major and minor receives its arterial blood supply from the dorsal scapular artery | |
| Nerve: | Both rhomboid major and minor are innervated by the dorsal scapular nerve (C4 and C5) | |
| Action: | Acting with the rhomboid minor, both muscles retracts the scapula and rotates it to depress the glenoid cavity. It also fixes the scapula to the thoracic wall. | |
| Dorlands/Elsevier | m_22/12550536 | |
The rhomboid major is a muscle on the back that connects the scapula with the vertebrae of the spinal column.
Contents |
[edit] Structure
The rhomboid major arises from the spinous processes of the thoracic vertebrae T2 to T5 as well as the supraspinous ligament. It inserts on the medial border of the scapula, from about the level of the scapular spine to the scapula's inferior angle.
The rhomboid major is considered a superficial back muscle. It is deep to the trapezius, and is located directly inferior to the rhomboid minor. As the word rhomboid suggests, the rhomboid major is diamond-shaped. The major in its name indicates that it is the larger of the two rhomboids.
[edit] Innervation
The rhomboid major, like the rhomboid minor, is innervated by the dorsal scapular nerve.
[edit] Actions
The rhomboid major helps to hold the scapula (and thus the upper limb) onto the ribcage. It also acts to retract the scapula, pulling it towards the vertebral column.
[edit] Additional images
Surface anatomy of the back. |
[edit] See also
[edit] External links
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 As such, some of the information contained herein may be outdated.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.
de:Musculus rhomboideus majorfr:Muscle grand rhomboïde id:Otot rhomboideus major ja:菱形筋 sv:Rhomboideus major
