Obliquus Capitis Inferior

The obliquus capitis inferior is a suboccipital muscle of the neck. It is the only muscle within the suboccipital group which has no attachment to the cranium.

• Attachments: Originates from the spinous process of the C2 vertebra and attaches onto the transverse process of C1.
• Actions: Extension and rotation of the head.
• Innervation: Suboccipital nerve (posterior ramus of C1)
• Blood supply: Vertebral artery and deep descending branches of the occipital artery

By TeachMeSeries Ltd (2025)

Fig 1
The left occipital muscles, which lie underneath the deep muscles of the back.