Serratus posterior inferior muscle
- Serratus posterior inferior muscle
Muscle infobox
Name = Serratus posterior inferior muscle
Latin =
GraySubject = 117
GrayPage = 404
Caption = Muscles connecting the upper extremity to the vertebral column. (Serratus posterior inferior labeled at center right.)
Origin = vertebrae T11 - L3
Insertion = the inferior borders of the 9th through 12th ribs
Action = depress the lower ribs, aiding in expiration
Blood = intercostal arteries
Nerve = intercostal nerves
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MeshNumber =
DorlandsPre =
DorlandsSuf =
The Serratus posterior inferior muscle (or posterior serratus) is a muscle of the human body.
Origin and insertion
The muscle lies at the junction of the thoracic and lumbar regions. It arises from the vertebrae T11 through L3 and runs superolaterally to attach to the lower border of the 9th through 12th ribs.
It is situated at the junction of the thoracic and lumbar regions: it is of an irregularly quadrilateral form, broader than the serratus posterior superior muscle, and separated from it by a wide interval.
It arises by a thin aponeurosis from the spinous processes of the lower two thoracic and upper two or three lumbar vertebræ, and from the supraspinal ligament.
Passing obliquely upward and lateralward, it becomes fleshy, and divides into four flat digitations, which are inserted into the inferior borders of the lower four ribs, a little beyond their angles.
The thin aponeurosis of origin is intimately blended with the lumbodorsal fascia, and aponeurosis of the Latissimus dorsi.
Function
Serratus Posterior Inferior draws the lower ribs backward and downward to assist in rotation and extension of the trunk. This movement of the ribs also contributes to forced expiration of air from the lungs.
ee also
* Serratus anterior muscle
* Serratus posterior superior muscle
External links
*
* - "Intermediate layer of the extrinsic muscles of the back, deep muscles."
*
Wikimedia Foundation.
2010.
Look at other dictionaries:
serratus posterior inferior muscle — musculus serratus posterior inferior … Medical dictionary
Serratus posterior superior muscle — Muscle infobox Name = Serratus posterior superior muscle Latin = musculus serratus posterior superior GraySubject = 117 GrayPage = 404 Caption = Origin = nuchal ligament (or ligamentum nuchae) and the spinous processes of the vertebrae C7 through … Wikipedia
serratus posterior inferior — n a thin quadrilateral muscle at the junction of the thoracic and lumbar regions that arises chiefly from the spinous processes of the lowest two thoracic and first two or three lumbar vertebrae, is inserted into the lowest four ribs, and acts to … Medical dictionary
serratus posterior inferior — noun a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached • Hypernyms: ↑posterior serratus muscle, ↑serratus posterior, ↑musculus serratus … Useful english dictionary
Serratus posterior — may refer to: *Serratus posterior superior muscle *Serratus posterior inferior muscle … Wikipedia
serratus posterior — noun skeletal muscle that draws the rib cage backward and downward • Syn: ↑posterior serratus muscle, ↑musculus serratus posterior • Hypernyms: ↑serratus, ↑serratus muscles • Hyponyms: ↑serratus posterio … Useful english dictionary
musculus serratus posterior inferior — [TA] inferior posterior serratus muscle: origin, spines of two lower thoracic and two or three upper lumbar vertebrae; insertion, inferior border of four lower ribs; innervation, ninth to twelfth thoracic; action, lowers ribs in expiration … Medical dictionary
Serratus anterior muscle — Muscle infobox Name = Serratus anterior |(boxer musscle) Latin = musculus serratus anterior GraySubject = 122 GrayPage = 438 Caption = Serratus anterior Caption2 = The left side of the thorax. Origin = fleshy slips from the outer surface of upper … Wikipedia
Serratus — means a muscle in the trunk (thorax). [cite web|title=serratus definition of serratus by the Free Online dictionary|url=http://www.thefreedictionary.com/serratus] ee also*Serratus anterior muscle *Serratus posterior superior muscle *Serratus… … Wikipedia
musculus serratus posterior — noun skeletal muscle that draws the rib cage backward and downward • Syn: ↑posterior serratus muscle, ↑serratus posterior • Hypernyms: ↑serratus, ↑serratus muscles • Hyponyms: ↑serratus posterior inferior, ↑ … Useful english dictionary
