Deep layers of intrinsic back muscles

Question 0

Semispinalis insertion?

Answer 0

fibers run superomedially to occipital bone and spinous processes in upper thoracic and cervical regions, spanning four to six segments

Question 1

what is the origin of the semispinalis? (thoracis, cervicis, capitis)

Answer 1

arises from transverse processes of C4-C10 vertebrae

Question 2

semispinalis nerve supply?

Answer 2

posterior rami of spinal nerves

Question 3

Main Actions of Semispinalis?

Answer 3

extends head and thoracic and cervical regions of vertebral column and rotates them contralaterally

Question 4

Multifudus origin?

Answer 4

arises from posterior sacrum, posterior superior iliac spine of ilium, aponeurosis of erector spinae, sacro-iliac ligaments, mammillary processes of lumbar vertebrae transverse processes of thoracic vertebrae, and articular processes of C4-C7

Question 5

Multifudus insertion?

Answer 5

thickest in lumbar region, fibers pass obliquely superomedially to entire length of spinous processes of vertebrae located two to four segements superior to origin

Question 6

Multifudus nerve supply?

Answer 6

posterior rami of spinal nerves

Question 7

Main Actions of Multifudus

Answer 7

Unilateral contraction rotates to contralateral side; stabilizes vertebrae during local movements of vertebral column

Question 8

rotatores (brevis and longus) origin?

Answer 8

arise from transverse processes of vertebrae; are best developed in thoracic region

Question 9

rotatores insertion?

Answer 9

fibers pass superomedially to attach to junction of lamina and transverse process or spinous process of vertebra immediately (brevis) or two segments (longus) superior to vertebra of origin

Question 10

rotatres nerve supply?

Answer 10

posterior rami of spinal nerves

Question 11

Rotatores Main action?

Answer 11

may function as organs of proprioception, possibly stabilize vertebrae and assist with local extension and rotatory movements of vertebral column

Question 12

Interspinales Origin?

Answer 12

superior surfaces of spinous processes of cervical and lumbar vertebrae

Question 13

interspinales insertion?

Answer 13

inferior surfaces of spinous processes of vertebrae superior to vertebrae of origin

Question 14

interspinales nerve supply?

Answer 14

posterior rami of spinal nerves

Question 15

interspinales main actions?

Answer 15

Aid in extension and rotation of vertebral column

Question 16

intertransversarii origin?

Answer 16

transverse processes of cervical and lumbar vertebrae

Question 17

intertransversarii insertion?

Answer 17

transverse processes of adjacent vertebrae

Question 18

intertransversarii nerve supply?

Answer 18

posterior and anterior rami of spinal nerves

Question 19

intertransversarii main actions?

Answer 19

aid in lateral flexion of vertebral column, acting bilaterally, stabilize vertebral column

Question 20

Levatores Costarum Origin?

Answer 20

tips of transverse processes of C7 and T1-T11 vertebrae

Question 21

Levatores Costarum insertion?

Answer 21

pass inferolaterally and insert on rib between its tubercle and angle

Question 22

Levatores Costarum Nerve Supply?

Answer 22

posterior rami of C8-T11 spinal nerves

Question 23

Levatores Costarum Main Actions?

Answer 23

Elevate ribs, assisting respiration, assist with lateral flexion of vertebral column