Obliquus capitis inferior muscle

Obliquus capitis inferior muscle
Deep muscles of the back. (Obliq. infer. labeled at upper left.)
Details
Origin	spinous process of the axis
Insertion	lateral mass of atlas
Nerve	suboccipital nerve
Actions	Rotation of head and neck
Identifiers
Latin	musculus obliquus capitis inferior
TA	A04.2.02.007
FMA	32528
*Anatomical terms of muscle* [edit on Wikidata]

The obliquus capitis inferior muscle (/əˈblaɪkwəs ˈkæpᵻtᵻs/) is the larger of the two oblique muscles of the neck. It arises from the apex of the spinous process of the axis and passes laterally and slightly upward, to be inserted into the lower and back part of the transverse process of the atlas.

It lies deep to the semispinalis capitis and trapezius muscles.

The muscle is responsible for rotation of the head and first cervical vertebra (atlanto-axial joint).

It forms the lower boundary of the suboccipital triangle of the neck.

The naming of this muscle may be confusing, as it is the only capitis (L. "head") muscle that does NOT attach to the cranium.

Proprioception

The obliquus capitis inferior muscle, like the other suboccipital muscles, has an important role in proprioception. This muscle has a very high density of Golgi organs and muscle spindles which accounts for this. It is believed that proprioception may be the primary role of the inferior oblique (and indeed the other suboccipital muscles) allowing accurate positioning of the head on the neck.

Additional Images

Position of obliquus capitis inferior muscle (shown in red).
Close up. Vertebral column, occipital bone and obliquus capitis inferior muscle. The muscle arises from the apex of the spinous process of the axis and insert into the lower and back part of the transverse process of the atlas.
Obliquus capitis inferior's relationship to other suboccipital muscles.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

Wikimedia Commons has media related to Obliquus capitis inferior muscles.

-1368719280 at GPnotebook

Muscles of the neck

Cervical	Platysma Sternocleidomastoid Longus capitis Longus colli Scalene anterior middle posterior Rectus capitis anterior muscle Rectus capitis lateralis muscle

Suboccipital	Rectus capitis posterior major minor Obliquus capitis inferior superior

Suprahyoid	Mylohyoid Stylohyoid Digastric Geniohyoid

Infrahyoid	Thyrohyoid Sternohyoid Sternothyroid Omohyoid

Pharynx	Pharyngeal constrictor superior middle inferior Stylopharyngeus Salpingopharyngeus

Larynx	Cricothyroid Cricoarytenoid posterior lateral Arytenoid oblique arytenoid aryepiglottic transverse arytenoid Thyroarytenoid vocal thyroepiglottic

Trachea	Trachealis

Fasciae	Deep cervical fascia Pretracheal fascia Prevertebral fascia Investing layer Carotid sheath Alar fascia Palatine aponeurosis Buccopharyngeal fascia Pharyngobasilar fascia Pharyngeal raphe

This article is issued from Wikipedia - version of the 4/27/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.