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 1The left occipital muscles, which lie underneath the deep muscles of the back. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article