Sub occipital group of back muscles

Question 1

Rectus capitis posterior major

Answer 1

Origin:

• Spinous process of axis (C2)

Insertion:

• Lateral portion of occipital bone below inferior nuchal line

Innervation:

• Posterior rami of C1

Function:

• Extension of head
• Rotation of face to same side as muscle

Question 2

Rectus capitis posterior minor

Answer 2

Origin:

• Posterior tubercle of atlas (C1)

Insertion:

• Medial portion of occipital bone below inferior nuchal line

Innervation:

• Posterior ramus of C1

Function:

• Extension of head

Question 3

Obliquus capitis superior

Answer 3

Origin:

• Transverse process of atlas (C1)

Insertion:

• Occipital bone between superior and inferior nuchal lines

Innervation:

• Posterior ramus of C1

Function:

• Extension of head and beds it to the same side

Question 4

Obliquus capitis inferior

Answer 4

Origin:

• Spinous process of axis (C2)

Insertion:

• Transverse process of atlas (C1)

Innervation:

• Posterior ramus of C1

Function:

• Rotation of face to the same side