Corpus: Obliquus capitis inferior muscle
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1. Definition
The obliquus capitis inferior muscle is a skeletal muscle located on the neck. It belongs to the autochthonous back musculature.
2. Course
The area of origin of the obliquus capitis inferior muscle is the processus spinosus of the axis (2nd cervical vertebra). Following an oblique cranial course, the muscle attaches to the transverse process of the atlas (1st cervical vertebra).
3. Innervation
The oblique muscle is innervated by lateral branches of the posterior rami from the spinal nerves of spinal cord segments C1 and C2. The dorsal ramus of the first spinal nerve is also called the suboccipital nerve.
4. Function
The obliquus capitis inferior muscle rotates the atlas to the same side when contracted on one side. This also turns the head to the same side (displacement of the atlantooccipital joint).
See also: Back muscles