Corpus: Spinalis muscle
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This text has been translated by an AI and may sound raw. It will be reviewed shortly. Thank you for your patience!
Synonym: Musculus spinalis
English:
Definition[Bearbeiten]
The Musculi spinales belong to the interspinal system of the autochthonous back muscles.
Classification[Bearbeiten]
Three parts of the spinal muscles can be distinguished regionally:
- Musculus spinalis thoracis
- Musculus spinalis cervicis
- Musculus spinalis capitis
The spinalis capitis muscle is absent in most people.
Course[Bearbeiten]
Origin[Bearbeiten]
The spinalis thoracis muscle originates at the spinous processes of the lower thoracic vertebral bodies (10, 11, 12) and the 1st and 2nd lumbar vertebral bodies.
The cervical spinalis muscle originates from the spinous processes of the 4th to 7th cervical vertebrae.
The spinalis capitis muscle, if present, originates from the spinous processes of the lower cervical and upper thoracic vertebrae.
Appendix[Bearbeiten]
The spinalis thoracis muscle attaches to the spinous processes of the upper thoracic vertebrae.
The cervical spinalis muscle attaches to the spinous processes of the 2nd and 3rd cervical vertebrae.
The spinalis capitis muscle attaches between the linea nuchalis superior et inferior (os occipitale) together with the semispinalis capitis muscle.
Innervation[Bearbeiten]
The spinal muscles are innervated by the medial branches of the posterior rami of the respective segmental spinal nerves.
Function[Bearbeiten]
The spinal muscles in the cervical and thoracic spine extend the spinal column.
The function of the spinalis capitis muscle is unilateral rotation of the head to the opposite side and bilateral dorsiflexion in the atlantooccipital joint and in the cervical spine.