Lecture 9- Suboccipital Muscles

Question 0

Rectus Capitis Posterior Major

Innervation

Answer 0

Suboccipital nerve (C1 dorsal rami)

Question 1

Rectus Capitis Posterior Major
Origin
Insertions

Answer 1

Spinous process of axis (C2)

Lateral inferior nuchal line

Question 2

Rectus Capitis Posterior Major

Main Action?

Answer 2

Bilateral: Extends head at atlanto-occipital joint
Unilateral: Rotates head to same side

Question 3

Extend the head at the atlanto-occipital joint

Answer 3

• Rectus Capitis posterior major
• Rectus Capitis posterior minor
• Obliquus capitis superior

Question 4

Rectus Capitis Posterior Minor
Origin
Insertion

Answer 4

Tubercle of posterior arch of atlas (C1)

Median inferior nuchal line

Question 5

Rectus Capitis Posterior Minor
Innervation
Main action

Answer 5

Suboccipital nerve ( dorsal rami of C1)
Bilaterally: extends head at the Atlanta-occipital joint

Question 6

Obliquus Capitis Superior:
Origin
insertion

Answer 6

Atlas transverse process

Occipital bone

Question 7

Obliquus Capitis Superior
Innervation
Main actions

Answer 7

Suboccipital nerve
(C1 dorsal rami)
Bilateral: Extends head at atlanto-occipital joint
Unilateral: Bends head laterally

Question 8

Obliquus Capitis Inferior:
Origin
Insertion

Answer 8

Spinous process or axis (C2)

Transverse process of atlas (C1)

Question 9

Obliquus Capitis Inferior
Innervation
Main Action

Answer 9

Suboccipital nerve ( dorsal rami of C1)
Rotates atlas to turn face to other side

Question 10

Longus capitis
Superior attachment
Inferior attachment

Answer 10

Basilar part of occipital bone

Anterior tubercles of C3-C6 transverse processes

Question 11

Longus Capitis
Innervation
Main action

Answer 11

Anterior rami of C1-C3 spinal nerves
Bilateral: Flexes head at atlanto-occipital joint
Unilateral: Tilts and slightly rotates head to same side.

Question 12

Longus colli:
Origin
Insertion

Answer 12

Anterior tubercle of C1; bodies of C1-C3 and transverse processes of C3-C6.
Inferior attachment
Bodies of C5-T3; transverse processes of C3-C5

Question 13

Longus Colli:
Innervation
Main action

Answer 13

Innervation
Anterior rami of C2-C6 spinal nerves

Main actions
Bilateral: Flexes cervical spine (anterior bending of C2-C7)
Unilateral: Tilts and slightly rotates head to same side.

Question 14

Rectus Capitis anterior:
Origin
Insertion

Answer 14

Base of cranium, just anterior to occipital condyle
Inferior attachment
Anterior surface of lateral mass of C1

Question 15

Rectus Capitis Lateralis:
Origin
Insertion

Answer 15

Superior attachment
Jugular process of occipital bone
Inferior attachment
Transverse process of C1

Question 16

Rectus Capitis Lateralis
Innervation
Main action

Answer 16

Innervation
C1 (anterior ramus)
Main actions
Bilateral: Flexes head at atlanto-occipital joint
Unilateral: Lateral flexion at atlanto-occipital joint

Question 17

Also part of the posterior triangle of the neck:

• Posterior scalene
• Middle scalene
• Anterior scalene

Common main action of this group => ……. ……. …….

Answer 17

Flex neck laterally

Question 18

Anterior scalene:
Origin
Insertion

Answer 18

Anterior tubercles of transverse processes of
C3-C6

First rib

Question 19

Anterior scalene:
Innervation
Main action

Answer 19

C5-C7

Main actions
Flexes neck laterally;
Elevates first rib

Question 20

Middle scalene:
Origin
Insertion

Answer 20

Posterior tubercles of transverse processes of
C2-C7

First rib

Question 21

Middle scalene:
Innervation
Main action

Answer 21

C3-C8

Main actions
Flexes neck laterally;
Elevates first rib

Question 22

Posterior scalene:
Origin
Insertion

Answer 22

Posterior tubercles of transverse processes of
C4-C6

Second rib

Question 23

Posterior scalene:
Innervation
Main action

Answer 23

C6-C8

Main actions
Flexes neck laterally;
Elevates second rib