Intrinsic Sub-Occipital Muscles

Question 1

Origin of the Rectus capitis posterior major?

Answer 1

Spinous process of C2

Question 2

Insertion of Rectus capitis posterior major?

Answer 2

Occipital bone (inferior nuchal line, middle third)

Question 3

Innervation of Rectus capitis posterior?

Answer 3

C1 (posterior ramus = sub occipital nerve)

Question 4

Action of Rectus capitis posterior?

Answer 4

Bilateral: extends head
Unilateral: rotates head to same side (rotates ipsilateral)

Question 5

Origin of Rectus Capitis posterior minor?

Answer 5

C1 (posterior tubercle)

Question 6

Insertion of rectus capitis posterior minor?

Answer 6

Occipital bone (inferior nuchal line, inner third)

Question 7

Origin of obliquus capitis superior?

Answer 7

C1 (transverse process)

Question 8

Insertion of Obliquus capitis superior?

Answer 8

Occipital bone (inferior nuchal line, middle third; above rectus capitis posterior major)

Question 9

Action of Obliquus capitis superior?

Answer 9

Bilateral: extends head
Unilateral: tilts head to same side (ipsilateral lateral flexion); rotates to opposite side (rotates contralateral)

Question 10

Origin of Rectus capitis posterior major?

Answer 10

C2 (spinous process)

Question 11

Origin of Obliquus capitis inferior?

Answer 11

C2 (spinous process)

Question 12

Insertion of Obliquus capitis inferior?

Answer 12

C1 (transverse process)

Question 13

Action of Obliquus capitis inferior?

Answer 13

Bilaeral: extends head
Unilateral: rotates head to same side (rotates ipsilateral)

Question 14

Innervation of Obliquus capitis?

Answer 14

C1 (posterior ramus = sub occipital n.)