Spinalis

From Wikipedia, the free encyclopedia

Spinalis
Deep muscles of the back. (Spinalis dorsi visible at center. Other spinalis muscles not visible.)
Latin	musculus spinalis
Gray's	subject #115 399
Origin	spinous process
Insertion	spinous process
Artery:	lateral sacral artery
Nerve:	posterior branch of spinal nerve
Action:
Antagonist:	Rectus abdominis muscle
Dorlands /Elsevier	m_22/12550873

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.

Contents 1 Spinalis dorsi 2 Spinalis cervicis 3 Spinalis capitis 4 See also 5 External links

[edit] Spinalis dorsi

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 processes of the upper thoracic vertebræ, the number varying from four to eight.

It is intimately united with the Semispinalis dorsi, situated beneath it.

[edit] Spinalis cervicis

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.

[edit] Spinalis capitis

The Spinalis capitis (Biventer cervicis) is usually inseparably connected with the Semispinalis capitis.

[edit] See also

• Semispinalis muscle
• Erector spinae
• Longissimus
• Iliocostalis

[edit] External links

• SUNY Figs 01:06-04 - "Intrinsic muscles of the back."
• LUC spin
• spinalis+%28muscle%29 at eMedicine Dictionary
• Dissection at ithaca.edu

v • d • e List of muscles of torso BACK splenius (capitis, cervicis) - erector spinae (iliocostalis, longissimus, spinalis) - latissimus dorsi transversospinales: (semispinalis dorsi, semispinalis cervicis, semispinalis capitis, multifidus, rotatores) - interspinales - intertransversarii SUBOCCIPITAL rectus capitis posterior (major, minor) - obliquus capitis (inferior, superior) CHEST intercostales (external, internal, innermost) - subcostales - transversus thoracis - levatores costarum - serratus posterior (inferior, superior) - diaphragm ABDOMEN anterior/lateral wall: obliques (external, internal) - transversus abdominis - rectus abdominis - pyramidalis posterior wall: quadratus lumborum - psoas major/psoas minor - iliacus cremaster PELVIS/FLOOR levator ani (iliococcygeus, pubococcygeus, puborectalis) - coccygeus PERINEUM anal triangle: sphincter ani (externus, internus) superficial perineal pouch (superficial transverse perineal, bulbospongiosus, ischiocavernosus) deep perineal pouch (deep transverse perineal, sphincter urethrae membranaceae)

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.