Deep Back

Question 1

Nerves supplying epaxial division muscles

Answer 1

dorsal primary rami

Question 2

Nerves supplying hypaxial division muscles

Answer 2

ventral primary rami

Question 3

Muscles derived from epaxial divsion

Answer 3

deep extensor muscles of back

Question 4

Muscles derived from hypaxial division

Answer 4

infrahyoid
flexor muscles of vertebral column
quadratus lumborum

Question 5

What are the only muscles of the body innervated by dorsal primary rami

Answer 5

intrinsic back muscles

Question 6

Splenuis group

Answer 6

arise from posterior midline of back
proceed laterally and superiorly to their insertion
most superficial group

Question 7

Erector spinae group

Answer 7

arise from posterior midline of back or more laterally
run up longitudinally
largest muscle mass of back
origin from common tendon of origin

Question 8

Transversospinalis group

Answer 8

arise laterally
travel midline to their insertion
lies deeper to erector spinae group

Question 9

Suboccipital muscles

Answer 9

do not follow pattern

responsible for movement of head and neck only

Question 10

Semispinalis

Answer 10

lacking in lumbar region

lies superficial to multifidus

Question 11

Multifidus

Answer 11

deeper to semispinalis

thicker in lumbar region

Question 12

Segmental muscles

Answer 12

deepest part of transversospinalis group.
better developed in cerivical and lumbar regions
contains - interspinalis, intertranscersarii, rotatores

Question 13

Suboccipital Triangle contains

Answer 13

obilique capitis inferior, oblique capitis superior, and rectus capitais posterior major

Question 14

What does flexion in the vertebral column

Answer 14

anterior trunk muscles

Question 15

What does extenstion in vertebral column

Answer 15

mostly erector spinae

All others do as well except for intertransversarii

Question 16

What does lateral flexion of the vertebral column

Answer 16

intertransversarii
Splenius capitis and cervicus
erector spinae initiates lateral flexion unilateraly

Question 17

What do muscles on the opposite side of the flexion do

Answer 17

relax gradually

Question 18

What rotates the trunk to the opposite side

Answer 18

multifidi, rotators, and semispinalis muscles

Question 19

What rotate the truck to the same side

Answer 19

spenius muscles and erector spinae

Question 20

What rotates the atlas/turns the face to the same side

Answer 20

oblique capitis inferior and rectus apitis posterior major

Question 21

What extends the head bilaterally and flex to same side unilaterally

Answer 21

oblique capitius superior and rectus capitus posterior major

Question 22

What is the suboccipital triangle innervated by

Answer 22

Innervated by dorsal ramus of C1

Question 23

What artery goes through the suboccipital triangle

Answer 23

vertebral artery goes through it.

Question 24

What nerve lies below the suboccipital triangle

Answer 24

Greater occiptal nerve is below it