Deep posterior neck musculature

Question 1

List the 3 muscles that contribute to the suboccipital triangle

Answer 1

1. Rectus capitis posterior major
2. Obliquus capitis superior
3. Obliquus capitis inferior

Question 2

muscles of the deep posterior neck are innervated by which nerve

Answer 2

the suboccipital (C1) spinal nerve of the posterior ramus innervates the deep posterior neck muscles

Question 3

Identify the muscle

Answer 3

Rectus Capitis Posterior Minor

Question 4

Origin:
Insertion:
Action:
Innervation:

Answer 4

Rectus Capitis Posterior Minor

Origin: Posterior tubercle of C1 (Atlas)

Insertion: Medial part of the inferior nuchal line of the occipital bone

Action: Rotates the head to the same side (ipsilateral) at the atlanto-axial joint

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 5

Rectus Capitis Posterior Minor action

Answer 5

ipsilateral rotation of the Atlanta-axial joint

Question 6

Rectus Capitis Posterior Minor Innervation:

Answer 6

Suboccipital nerve (C1 dorsal ramus)

Question 7

Identify the muscle

Answer 7

Rectus Capitis Posterior Major

Question 8

Origin:
Insertion:
Action:
Innervation:

Answer 8

Rectus Capitis Posterior Major

Origin: Spinous process of C2 (Axis)

Insertion: Lateral part of the inferior nuchal line of the occipital bone

Action:
o Extends the head atlanto-occipital joint
o Rotates the head to the same side (ipsilateral) at the atlanto-axial joint

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 9

Rectus Capitis Posterior Major action

Answer 9

Action:
o Extends the head atlanto-occipital joint
o Rotates the head to the same side (ipsilateral) at the atlanto-axial joint

Question 10

Rectus Capitis Posterior Major innervation

Answer 10

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 11

Identify the muscle

Answer 11

Obliquus Capitis Superior

Question 12

Origin:
Insertion:
Action:
Innervation:

Answer 12

Obliquus Capitis Superior

Origin: Transverse process of C1 (Atlas)

Insertion: Occipital bone between superior and inferior nuchal lines

Action: (ipsilateral) Laterally flexes the neck & Extends the head at the atlanto-occipital joint

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 13

Obliquus Capitis Superior action

Answer 13

Action: Laterally flexes the neck to the same side (ipsilateral) & Extends the head at the atlanto-occipital joint

Question 14

Obliquus Capitis Superior innervation

Answer 14

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 15

Identify the muscle

Answer 15

Oliquus Capitis Inferior

Question 16

Origin:
Insertion:
Action:
Innervation:

Answer 16

Oliquus Capitis Inferior

Origin: Spinous process of C2 (Axis)

Insertion: Transverse process of C1 (Atlas)

Action: Rotates the head to the same side atlanto-axial joint

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 17

Oliquus Capitis Inferior action

Answer 17

Action: Rotates the head to the same side atlanto-axial joint

Question 18

Oliquus Capitis Inferior innervation

Answer 18

Innervation: Suboccipital nerve (C1 dorsal ramus)

Question 19

Muscles that extend the neck at the Atlanto-occipital joint

Answer 19

1. rectus capitis major
2. rectus capitis minor
3. Obliquus capitis superior

Question 20

Muscles that cause lateral flexion (3) of the neck

Answer 20

1. Obliquus capitis superior
2. Splenius capitis
3. longissimus capitis

Question 21

Muscles that cause ipsilateral rotation of the head (5)

Answer 21

1. Obliquus capitis inferior
2. Rectus capitis posterior major + minor
3. Longissimus capitis
4. Splenius capitis

Question 22

Muscles that cause contralateral rotation of the head

Answer 22

1. SCM
2. Semispinalis capitis

Question 23

List the 3 muscles that form the sub occipital triangle

Answer 23

1. Rectus capitis posterior major (super-medial)
2. Obliquus capitis superior(superolateral)
3. Obliquus capitis inferior (inferolateral)

Question 24

What is located in the sub occipital triangle?

Answer 24

1. Vertebral artery
2. sub-occipital nerve (C1)

Question 25

Vertebral Artery: 1. branch of the _____ artery 2. travels in the ______ foramen of C__ to C__ 3. Passes superiorly through the foramen _______

Answer 25

Vertebral Artery: 1. branch of the *subclavian* artery 2. travels in the *transverse* foramen of *C1 to C6* 3. Passes superiorly through the foramen *magnum*

Question 26

Prolonged head turning may reduce blood flow to the ______ artery (brain), causing light-headedness, dizziness, etc.

Answer 26

Prolonged head turning may reduce blood flow to the *vertebral* artery (brain), causing light-headedness, dizziness, etc.

Question 27

Identify surface anatomy of back:

Answer 27

Question 28

Identify muscles in triangle of auscultation

Answer 28

1. Trapezius (superomedial) 2. inferior border of rhomboid major (lateral) 3. Latissimus dorsi (inferior)

Question 29

Triangle of auscultation function:

Answer 29

thinning of muscle is an optimal space to listen to lungs