Obliquus Capitis Inferior

Original Editor - Evan Thomas

Lead Editors - Evan Thomas and Tarina van der Stockt  

Description

Obliquus Capitis Inferior (also known as the Inferior Oblique) is a small muscle that runs posteriorly and inferomedially from C1 to C2. It is situated under the deep cervical vein and comprises the inferior boarder of the suboccipital triangle.[1] It is the only suboccipital muscle that does not attach to the skull.[2]

OCI_post_view
OCI_right_lateral_view

Origin

Base of spinous process and adjoining lamina of the axis.[3]

Insertion

Along the inferior aspect of the tip of the transverse process of the atlas.[3]

Nerve Supply

Suboccipital nerve or dorsal ramus of cervical spinal nerve (C1).[3]

Blood Supply

Vertebral artery and the deep descending branch of the occipital artery.[3]

Action

Ipsilateral rotation of the atlantoaxial joint.[1]

Trigger Point Referral Pattern[2]

OCI_post_view

References

  1. 1.0 1.1 Agur AMR, Dalley AF (2012). Grant's Atlas of Anatomy (13th ed). Philadelphia, PA: Lippincott Williams & Wilkins.
  2. 2.0 2.1 Travell JG, Simons DG, Simons LS (1998). Travell and Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual, Volume 1: Upper Half of Body (2nd ed). Baltimore, MD: Williams & Wilkins.
  3. 3.0 3.1 3.2 3.3 http://www.anatomyexpert.com/structure_detail/5213/