Obliquus capitis superior muscle
Template:Short description Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters".Script error: No such module "Check for unknown parameters". The obliquus capitis superior muscle (Template:IPAc-en) is a smallScript error: No such module "Unsubst". muscle in the upper back part of the neck. It is one of the suboccipital muscles. It attaches inferiorly at the transverse process of the atlas (first cervical vertebra); it attaches superiorly at the external surface of the occipital bone. The muscle is innervated by the suboccipital nerve (the posterior ramus of the first cervical spinal nerve).
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Anatomy
The obliquus capitis superior muscle is one of the suboccipital muscles. It forms the superolateral boundary of the suboccipital triangle. It extends superoposteriorly from its inferior attachment to its superior attachment, becoming wider superiorly.[1]
Attachments
The muscle's inferior attachment is at the superior surface of the transverse process of the atlas (C1).[1][2]
Its superior attachment is onto the lateral portion of[2] the external surface of the occipital bone between the superior nuchal line and inferior nuchal line.[1][2] Its superior attachment is situated lateral to that of the semispinalis capitis muscle, and overlaps the attachment of the rectus capitis posterior major muscle.[1]
Innervation
The muscle receives motor innervation from the suboccipital nerve (i.e. the posterior ramus of the cervical spinal nerve 1 (C1)).[1][2]
Actions/movements
The muscle extends[1] and (ipsilaterally) laterally flexes the head.[1][2]
Additional images
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Position of obliquus capitis superior (shown in red). Animation.
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Still image. Posterior view.
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Deep muscles of the back (obliquus capitis superior labeled at upper left)
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Occipital bone. Outer surface. Muscle attachments are shown as red circles.
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Base of skull. Inferior surface. Muscle attachments are shown as red circles.
References
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External links
- Anatomy figure: 01:07-06 at Human Anatomy Online, SUNY Downstate Medical Center
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