Which muscle originates from the transverse process of C1 and inserts on the occipital bone?

Which muscle originates from the transverse process of C1 and inserts on the occipital bone?

• A. Obliquus capitis superior
• B. Obliquus capitis inferior
• C. Rectus capitis posterior major
• D. Rectus capitis posterior minor

Answer: (A)

The main idea here is matching both the origin and the insertion to identify the muscle. The muscle that starts from the transverse process of the first cervical vertebra (the atlas) and ends on the occipital bone is the obliquus capitis superior. This attachment pattern places it in the suboccipital region and gives it a role in extending the head at the atlanto-occipital joint, with a bit of lateral tilt. The other muscles don’t fit this exact origin-insertion combo: the obliquus capitis inferior comes from the axis (C2) and attaches to the atlas (C1), not to the occipital bone; the rectus capitis posterior major attaches to the occipital bone but originates from the axis (C2); and the rectus capitis posterior minor attaches to the occipital bone but originates from the posterior tubercle of the atlas (C1), not from the transverse process.

The main idea here is matching both the origin and the insertion to identify the muscle. The muscle that starts from the transverse process of the first cervical vertebra (the atlas) and ends on the occipital bone is the obliquus capitis superior. This attachment pattern places it in the suboccipital region and gives it a role in extending the head at the atlanto-occipital joint, with a bit of lateral tilt.

The other muscles don’t fit this exact origin-insertion combo: the obliquus capitis inferior comes from the axis (C2) and attaches to the atlas (C1), not to the occipital bone; the rectus capitis posterior major attaches to the occipital bone but originates from the axis (C2); and the rectus capitis posterior minor attaches to the occipital bone but originates from the posterior tubercle of the atlas (C1), not from the transverse process.