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Obliquus superior capitis muscle

The Obliquus superior capitis muscle, also known as the obliquus capitis superior, is one of the small, deep muscles located in the suboccipital region at the base of the skull. It plays an important role in the fine motor control of head movements and is crucial in the suboccipital triangle anatomy. Understanding its detailed anatomy and imaging characteristics is vital for clinicians, radiologists, and students dealing with neck and head pathology.

Synonyms

  • Obliquus capitis superior

  • Superior oblique muscle of the head

Function

  • Assists in extension of the head at the atlanto-occipital joint

  • Aids in lateral flexion (tilting) of the head to the same side

  • Stabilizes the atlanto-occipital joint during head movements

Origin

  • Transverse process of the atlas (C1 vertebra)

Insertion

  • Occipital bone, specifically between the superior and inferior nuchal lines

Nerve Supply

  • Suboccipital nerve (dorsal ramus of C1)

Artery Supply

  • Branches of the vertebral artery

  • Occipital artery

Vein Supply

  • Occipital vein

  • Vertebral vein

MRI Appearance

  • T1-weighted images: The obliquus superior capitis muscle appears as an intermediate to low signal structure, consistent with normal skeletal muscle.

  • T2-weighted images: The muscle maintains low signal intensity, similar to other skeletal muscles.

  • STIR (Short Tau Inversion Recovery): The muscle is low in signal; any pathology or edema would show as a high signal area, but normal muscle is dark.

CT Appearance

  • The obliquus superior capitis muscle appears as a well-defined, soft tissue density in the suboccipital region, distinguishable from surrounding fat and bone.

MRI images

Obliquus superior capitis muscle mri axial image