Spinal muscle

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Spinal muscle
Spinalis.png
Thoracic spinal muscle
origin
Spinous processes
approach
Spinous processes
function
Stabilization of the spine
Innervation
Rami dorsales of the spinal nerves

The spinal muscle ( Latin for "spinous process muscle ") is a skeletal muscle located on the spine . It belongs to the so-called autochthonous back muscles and within this to the interspinous system ( Systema interspinale ) and to the erector spinae muscle ("spinal erector "). The spinal muscle can be divided into three sections:

  • Musculus spinalis thoracis [chest part],
  • Musculus spinalis cervicis [neck part] and
  • Spinalis capitis muscle [head part].

When tensioned on one side, the muscle supports the lateral inclination of the spine to the same side; when tensioned on both sides, it tilts the spine backwards.

Thoracic spinal muscle

The M. sp. thoracis arises from the spinous processes of the last two thoracic and first two lumbar vertebrae and inserts into the spinous processes of the second to eighth thoracic vertebrae.

Spinalis cervicis muscle

The delicate spinalis cervicis muscle is not always present (inconsistent). It arises from the spinous processes of the second thoracic to sixth cervical vertebrae and inserts into the spinous process of the fourth to second cervical vertebrae.

Spinalis capitis muscle

The M. sp. capitis is inconsistent and usually fused with the semispinalis capitis muscle. It arises from the spinous processes of the last two cervical and first two thoracic vertebrae and runs to the protuberantia occipitalis externa of the occiput .

Other mammals

In veterinary anatomy, a distinction is only made between a chest and a neck part. In predators and ruminants, these are inseparable from the corresponding sections of the semispinalis muscle - i.e. M. semispinalis thoracis and M. semispinalis cervicis - which is why the muscle in these animal groups is instead called the musculus spinalis et semispinalis thoracis et cervicis (or for short: musculus spinalis) et semispinalis ).

Individual evidence

  1. a b c Werner Platzer: Taschenatlas Anatomie, Volume 1, Georg Thieme Verlag, Stuttgart 2009, ISBN 978-3-13-492010-9 , p. 172
  2. a b Bernhard N. Tillmann: Atlas of human anatomy: with muscle tables . Springer-Verlag, 3rd edition 2016, ISBN 978-3-662-49288-8 , p. 587.
  3. Franz-Viktor Salomon: muscle tissue . In: Anatomy for veterinary medicine. Enke Stuttgart. 3rd ext. Edition 2015, ISBN 978-3-8304-1288-5 , p. 183.