Superfical And Intermediate Layers Of Intrinsic Back Muscles

Question 0

What is the insertion of the splenius capitis muscle?

Answer 0

Fibers run superolaterally to mastoid process of the temporal bone and lateral third of superior nuchal line of occipital bone.

Question 1

Where is the origin of splenius intrinsic back muscles?

Answer 1

Arises from nuchal ligament and spinous process of C7-T6 vertebrae

Question 2

Where is the insertion of the splenius cervicis muscle?

Answer 2

Tubercles of transverse processes of C1-C3 or C4 vertebrae

Question 3

Nerve supply of splenius muscles

Answer 3

Posterior rami of spinal nerves

Question 4

Action of splenius muscles

Answer 4

Acting alone: laterally flex neck and rotate head to side of active muscles
Acting together: extend head and neck

Question 5

Origin of erector Spinae muscles
Illocostalis
Longissimus
Spinalis

Answer 5

Arises by broad tendon from posterior part of iliac crest, posterior surface of sacrum, sarco-iliac ligaments, sarco and inferior lumbar spinous processes and supraspinous ligament

Question 6

Insertion of illocostallis muscle (lateral column)

Answer 6

Fibers run superiorly to angles of lower ribs and cervical transverse processes.

Lumborum, thoracis, cervicis

Question 7

Insertion of Longissimus muscles

Intermediate column

Answer 7

Fibers run superiorly to the ribs between tubercles and angles to transverse processes in thoracic and cervical regions and to the mastoid process of the temporal bone.

Thoracis, cervicis and capitis

Question 8

Insertion of Spinalis muscles

Medial column

Answer 8

Fibers run superiorly to spinous process in upper thoracic region and to the cranium.

Thoracis, cervicis, capitis

Question 9

Nerve supply to intermediate intrinsic back muscles

Illocostallis, Longissimus, Spinalis

Answer 9

Posterior rami of spinal nerves

Question 10

Action of intermediate back muscles

Answer 10

Acting bilaterally: extend vertebral column and head, as back is flexed, control movement by gradually lengthing their fibers

Acting unilaterally: laterally flex vertebral column

Question 11

Origin of interspinales muscle

Answer 11

Superior surfaces of spinous process of cervical and lumbar vertebrae

Question 12

Origin of intertransversarii muscle

Answer 12

Transverse processes of cervical and lumbar vertebrae

Question 13

Origin of levatores costarum muscle

Answer 13

Tips of transverse processes of C7 and T1-T11 vertebrae

Question 14

Insertion of interspinales muscle

Answer 14

Inferior surfaces of spinous processes of vertebrae superior to vertebrae of the origin

Question 15

Insertion of intertransversarii muscle

Answer 15

Transverse process of adjacent vertebrae

Question 16

Insertion of levatores costarum muscle

Answer 16

Pass inferolaterally and insert on the rib between its tubercle and angle

Question 17

Nerve supply of interspinales

Answer 17

Posterior rami of spinal nerves

Question 18

Nerve supply of intertransversarii

Answer 18

Posterior and anterior rami if spinal nerves

Question 19

Nerve supply of levatores costarum

Answer 19

Posterior rami of C8-T11 spinal nerves

Question 20

Action of interspinales

Answer 20

Aid in extension and rotation of vertebral column

Question 21

Action of intertransversarii

Answer 21

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

Question 22

Action of levatores costarum

Answer 22

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