deep back muscles

Question 0

what is the insertion for the splenius capitis?

Answer 0

fibers run superolaterally to mastoid process of tmporal bone and lateral third of superior nuchal line of occipital bone

Question 1

what is the origin of the splenius?

Answer 1

the splenius arises frmo the nuchal ligament and spinuous process of C7-T6 vertebrae

Question 2

what is the point of insertion for the splenius cervicis?

Answer 2

tubercles of transverse process of c1-c3 or c4 vertebrae

Question 3

what is the nerve supply for splenius capitis and cirvicis?

Answer 3

postrerior rami of spinal nerves

Question 4

what is the action of the splenius ?

Answer 4

acing alone: laterally flex neck and rotate head to side of active muscles

acting togther: extend head and neck

Question 5

what is the origin for the iliocostalis, longissimus, and spinalis?

Answer 5

these three arise from a broad tendon from the posterior part of the iliac crest, posterior surface of the sacrum, sacro-iliac ligaments, sacral and inferior lumbar spinuous processes, and supraspinuous ligament

Question 6

what is the insertion for the iliocostalis?

Answer 6

fibers run superiorly to angles of lower ribs and cervical transverse processes

Question 7

what are the subdivisions of the iliocostalis?

Answer 7

lumborum, thoracic, and cervicis

Question 8

what ar the subdivisions of the longissimus?

Answer 8

thoracic, cervicis, capitis

Question 9

what is the pointo of insertion for the longissimus?

Answer 9

fibers run supriorly to the ribs between tubercles and angles to transverse processs in thoracic and cervical regions and to mastoid process of temporal bone

Question 10

what are the subdivisions of the spinalis?

Answer 10

thoracic, capitis, cervicis

Question 11

what is the point of insertion for the spinalis?

Answer 11

fibers run superior to spinuous processes in upper thoracic region and to cranium

Question 12

what are the actions for the iliocostalis, longissimus and spinalis?

Answer 12

acting bilaterally: extend vertebral column and head; as back is flexed, control movement by gradually lengthening their fibers

acting unilaterally: laterally flex vertebral column

Question 13

what are the subdivisions of the semispinalis?

Answer 13

thoracic, cervicis and capitis

Question 14

what is the origin of the semispinalis?

Answer 14

the semisspinalis arises from transverse proceses of c4-t10

Question 15

what is the point of insertion for the semispinalis?

Answer 15

the point of insertion for the semispinalis are the fibers that run superomedially to occipital and spinuous processes in upper thoracic and cervical regions, spanning four to six segments

Question 16

what is the nerve supply for the semispinalis?

Answer 16

posterior rami of spinal nerves

Question 17

what are the main actions of the semispinalis?

Answer 17

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

Question 18

what are the subdivisions of the semispinalis?

Answer 18

thoracis, cervicis and capitis

Question 19

what is the origin of the multifidus?

Answer 19

the multifidus arises from the posterior sacrum, posterior superior illiac spine of illium, aponeurosis of erecor spinae, sacro-illiac ligaments, mamilary processes of lumbar vertabrae, transverse processes of thoracic vertebrae, and articular processes of c4-c7

Question 20

where is the insertion for the maltifidus?

Answer 20

the maltifidus is thickest in the lumbar region, the fibers pass obliquely superomedially to entire length of spinuous process of vertebrae located two to four segments superior to origin

Question 21

what is the nerve supply for the multifidus?

Answer 21

the posterior rami of the spinal nerves

Question 22

what is the main action fo the multifidus?

Answer 22

unilateral contraction rotates to contrilatteral side; stabalized vertebrae during local movements of vertebral column

Question 23

what is the origin of th rotatores?

Answer 23

the rotatores arise from the transverse processes of vertebrae; are best devloped in the thoracic region

Question 24

what is the insertion for the rotatores?

Answer 24

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

Question 25

what is the nerve supply of the rotatores?

Answer 25

posterior rami of spinal nerves

Question 26

what are the actions for the rotatores?

Answer 26

the rotatores mayy function as organs of proprioception; possibly stabalize vertebrae and assist with local extension and rotatory movements of vertebral column