Suboccipital triangle

Question 1

Obliquus capitis superior

Answer 1

Origin: transverse process of atlas (C1)

Insertion: occipital bone (inferior nuchal line, middle third, above rectus capitis posterior major)

Action: Extension and ipsilateral rotation of head

Nerve: Suboccipital n. (C1 dorsal primary ramus)

Artery: Occipital a.

Question 2

Obliquus Capitis Inferior

Answer 2

Origin: Spinous process of axis (C2)

Insertion: Transverse process of atlas (C1)

Action: Ipsilateral rotation of the head

Nerve: Suboccipital n. (C1 dorsal primary ramus)

Artery: Occipital a.

Question 3

Rectus Capitis Posterior Major

Answer 3

Origin: Posterior tubercle of axis (C2)

Insertion: Occipital bone (inferior nuchal line, middle third)

Action: Extension and ipsilateral rotation of the head

Nerve: Suboccipital n. (C1 dorsal primary ramus)

Artery: Occipital a.

Question 4

Rectus Capitis Posterior Minor (not in triangle!)

Answer 4

Origin: posterior tubercle of atlas (C1)

Insertion: Medial part of occipital bone, below inferior nuchal line

Action: extension of the head

Nerve: Suboccipital n. (C1 dorsal primary ramus)

Artery: Occipital a.