Name = PAGENAME
Latin = musculus spinalis
GraySubject = 115
GrayPage = 399
Caption = Deep muscles of the back. (Spinalis dorsi visible at center. Other spinalis muscles not visible.)
spinous processThoracis: Upper lumbar and lower thoracic vertebrae. Cervicis: Ligamentum nuchae & spinous process of C7.
spinous processThoracis: SP of upper thoracic vertebrae. Cervicis: SP of cervical vertebrae except C1.
Action = Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column.
lateral sacral artery
posterior branch of spinal nerve
Rectus abdominis muscle
DorlandsPre = m_22
DorlandsSuf = 12550873
The spinalis is the portion of the
erector spinae, a bundle of muscles and tendons, located nearest to the spine. It is divided into three parts.
The Spinalis dorsi, the medial continuation of the
Sacrospinalis, is scarcely separable as a distinct muscle.
It is situated at the medial side of the
Longissimus dorsi, and is intimately blended with it; it arises by three or four tendons from the spinous processes of the first two lumbar and the last two thoracic vertebrae: these, uniting, form a small muscle which is inserted by separate tendons into the spinous processesof the upper thoracic vertebræ, the number varying from four to eight.
It is intimately united with the
Semispinalis dorsi, situated beneath it.
The Spinalis cervicis (Spinalis colli) is an inconstant muscle, which arises from the lower part of the
ligamentum nuchæ, the spinous process of the seventh cervical, and sometimes from the spinous processes of the first and second thoracic vertebræ, and is inserted into the spinosus process of the axis, and occasionally into the spinous processes of the two vertebræ below it.
The Spinalis capitis (Biventer cervicis) is usually inseparably connected with the
* - "Intrinsic muscles of the back."
* [http://www.ithaca.edu/faculty/lahr/LE2000/Back/FinishedPics/JPEGs/ErectorsFar.jpgDissection at ithaca.edu]
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