Head Muscles

Question 1

Rectus capitis anterior

Answer 1

O: Lateral masses C1
I: Basilar part of the occipital bone
A:
Bilateral: flexion of the atlanto-occipital joint
Unilateral: lateroflexion of the atlanto-occipital joint
In: Ventral r. C1

Question 2

Rectus capitis posterior major

Answer 2

O: Spinous process C2
I: Inferior nuchal line
A:
Bilateral: extension of the head
Unilateral: ipsilateral rotation of the head
In: Suboccipital n.

Question 3

Rectus capitis posterior minor

Answer 3

O: Posterior tubercle C1
I: Inferior nuchal line
A: Extension of the head
In: Suboccipital n.

Question 4

Rectus capitis lateralis

Answer 4

O: Transverse process C1
I: Basiliar part of occipital bone
A:
Bilateral: flexion of the Atlanto-occipital joint
Unilateral: lateroflexion of the atlanto-occipital joint
In: Ventral r. C1

Question 5

Obliquus capitis superior

Answer 5

O: Transverse process of C1
I: Inferior nuchal line
A:
Bilateral: extension of the head
Unilateral: ipsilateral inclination, controlateral rotation of the head
In: Suboccipital n.

Question 6

Obliquus capitis inferior

Answer 6

O: Spinous process C2
I: Transverse process C1
A: Ipsilateral rotation of the head, secondary extension
In: Suboccipital n., occipital majors nn.

Question 7

Temporalis

Answer 7

O: Temporal fossa
I: Tendon into the apex and deep surface of the coronoid process and anterior ramus of the mandible
A:
Retraction of the mandible (post fibers)
Elevation of the mandible (ant fibers)
In: Trigeminal n. (cranial nerve (V))

Question 8

Masseter

Answer 8

O: Zygomatic process of the maxilla and anterior 2/3 of zygomatic arch
I: Angle and ramus of mandible
A: Protraction and elevation of the mandible
In: Trigeminal n. (V cranial nerve)