Deep And Intermediate Back

Question 1

Splenius Origin

Answer 1

Arises from nuchal ligament and spinous processes of C7-T6

Question 2

Splenius Insertion

Answer 2

Splenius Capitus Fibers run superiorlaterally to mastoid process of temporal bone and lateral 1/3 of superior nuchal line of occipital bone

Splenius Cervicis: tubercles of transverse processes of C1-C3

Question 3

Splenius capitus/cervicis inneravation

Answer 3

Posterior rami of spinal nerves

Question 4

Splenius Capitis/Cervicis Action

Answer 4

Actions alone: Laterally flexes neck and rotates head to side of active muscle

Actions together: Extend head and Neck

Question 5

Illiocostalis Longissimus Spinalis Origin

Answer 5

Broad tendon from posterior part of illiac crest

Posterior Surface of Sacrum

Sacro-Illiac ligaments

Sacral inferior lumbar spinous processes

Supraspinous Ligament

Question 6

Illiocostalis insertion

Answer 6

Illiocostalis inserts superiorly to angles of lower ribs and cervical transverse processes

Question 7

Longissimus Insertion

Answer 7

Fibers run superiorly to ribs between tubercles and angles to transverse processes in thoracic and cervical regions

mastoid process of temporal bone

Question 8

Spinalis Insertion

Answer 8

Fibers run superiorly to spinous processes in upper thoracic region and to cranium

Question 9

Main actions of Illiocostalis Longissimus Spinalis

Answer 9

Acting bilaterally: Extend vertebral column and heads, control movement as back is flexed by lengthening their fibers

Unilateral action: Laterally flex vertebral column

Question 10

Semispinalis regions

Answer 10

Thoracis, Cervicis, Capitis

Question 11

Semispinalis origin

Answer 11

Transverse process of C4-T10 Vertebrae

Question 12

Semispinalis Insertion

Answer 12

Runs superomediallu to occipital bone and spinous processes in upper thoracic and cervical regions

Question 13

Semispinalis action

Answer 13

Extends head and thoracic and cervical regions of vertebral column

Rotates them conrtalaterally

Question 14

Multifidus Origin

Answer 14

Arises from posterior sacrum, posterior iliac spine, aponeurosis of erector spinal, sacro-iliac ligament

Question 15

Multifidus Insertion

Answer 15

Thickest in lumbar region, fibers pass obliquely superomedially to entire length of spinous process of vertebrae

Question 16

Multifidus action

Answer 16

Unilateral contraction rotates to contralateral side

Stabilizes vertebrae during local movements of vertebral column

Question 17

Rotatores Origin

Answer 17

Arise from transverse process of vertebrate

Best developed in thoracic region

Question 18

Rotatores Insertion

Answer 18

Fibers pass superiomedially to attach t the junction of laminate and transverse process or spinous process

Question 19

Rotatores Action

Answer 19

Organs of propioreception

Possibly stabilize vertebrae and assist with local extension and rotator movements of vertebral column