Intrinsic Back Muscles Flashcards Preview

Clinical Anatomy - Trunk/Thorax > Intrinsic Back Muscles > Flashcards

Flashcards in Intrinsic Back Muscles Deck (24)
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1

Superficial intrinsic back muscles (1)

splenius

2

Splenius - O

arises from nuchal ligament and spinous processes of C7-T6

3

Splenius - N

posterior rami of spinal nerves

4

Splenius - A

acting alone: lateral flexion of neck
rotation of head to ipsilateral side of muscle
acting together: extension of head and neck

5

Intermediate intrinsic back muscles (3)

iliocostalis
longissimus
spinalis

6

Erector spinae

iliocostalis
longissimus
spinalis

7

Erector spinae- O

thoracolumbar fascia

8

Erector spinae - N

posterior rami of spinal nerves

9

Erector spinae - A

acting bilaterally: head and vertebral extension as back is flexed (controls movement by gradually lengthening fibers)
acting unilaterally: lateral flexion of vertebral column

10

Deep intrinsic back muscles (3)

semispinalis (thoracis, cervicis, and capitis)
multifidus
rotatores (brevis and longus)

11

Semispinalis - N

posterior rami of spinal nerves

12

Semispinalis - A

extension and contralateral rotation of head, T-spine, and C-spine

13

Multifidus - N

posterior rami of spinal nerves

14

Multifidus - A

unilateral contraction rotates to contralateral side
vertebral stabilization during local movements of vertebral column

15

Rotatores - N

posterior rami of spinal nerves

16

Rotatores - A

proprioception
possible vertebral stabilization
assist local extension and rotation of vertebral column

17

Minor deep intrinsic back muscles (3)

interspinales
intertransversaril
levatores costarum

18

Interspinales - N

posterior rami of spinal nerves

19

Interspinales - A

assist in vertebral extension and rotation

20

Intertransversarii - N

anterior and posterior rami of spinal nerves

21

Intertransversarii - A

assist in vertebral lateral flexion
bilaterally vertebral stabilization

22

Levatores costarum - N

posterior rami of C8-T11 spinal nerves

23

Levatores costarum - A

elevation of ribs
assist respiration
assist vertebral lateral flexion

24

Transversospinales

semispinalis
multifidus
rotatores