Deep Back Muscles

Question 1

What are the extrinsic back muscles?

Answer 1

The ones that connect lim to axial skeleton (superficial): trapezius, latissimus dorsi, levator scapulae, rhomboideus major and minor. AND the respiratory muscles (intermediate): serratus posterior superior and serratus posterior inferior

Question 2

Superficial back muscles connect limb to axial skeleton and and innervated by CN XI. What are these extrinsic back muscles?

Answer 2

Trapezius 
Latissimus dorsi
Levator scapulae
Rhomboideus major
Rhomboideus minor

Question 3

Intermediate back muscles include respiratory muscles that include the serratus posterior group. What are these extrinsic back muscles?

Answer 3

Serratus posterior superior and serratus posterior inferior

Question 4

What are the deep intrinsic back muscles?

Answer 4

Superficial: splenius capitus and splenius cervicis

Intermediate: iliocostalis, logissimus, and spinalis

Deep: semispinalis, multifidus, and rotatores

Question 5

What are the epaxial muscles?

Answer 5

Spinalis
Longissimus
Iliocostalis

Question 6

What are the hypaxial muscles?

Answer 6

Quadratus
Lumborum
External oblique
Internal oblique
Transversus
Rectus abdominus

Question 7

Serratus posterior superior origin

Answer 7

Ligamentum nuchae; spinous processes of C7 and T1-2

Question 8

Serratus posterior superior insertion

Answer 8

Ribs 2-5

Question 9

Serratus posterior superior action

Answer 9

Elevate upper ribs during inspiration

Question 10

Serratus posterior inferior origin

Answer 10

Spinous processes of T11-12 and L1

Question 11

Serratus posterior inferior insertion

Answer 11

Ribs 10-12

Question 12

Serratus posterior inferior action

Answer 12

Pull lower ribs inferiorly and counteracts diaphragm

Question 13

What are the 2 parts of the spinotrasversalis system?

Answer 13

Spenius capitis and splenius cervicis

Question 14

The sacrospinalis sys aka…

Answer 14

Erector spinae

Question 15

What are the 3 longitudinal bundles that form the sacrospinalis system

Answer 15

Iliocostalis, longissimus, and spinalis

Question 16

What are the 3 groups of muscles that make up the transversospinalis system?

Answer 16

Semispinalis,multifidus, rotatores

Question 17

Along either side of the midline of the back is innervated by

Answer 17

Dorsal rami of thoracic spinal nerves

Question 18

More laterally along the back is innervated by

Answer 18

Lateral cutaneous branches of the intercostal nerves

Question 19

Splenius capitis origin

Answer 19

Spinous processes of C7 and T1-4

Question 20

Splenius capitis insertion

Answer 20

Superior nuchal line and mastoid

Question 21

Splenius cervicis origin

Answer 21

Spinous processes of T3-6

Question 22

Splenius cervicis insertion

Answer 22

C1-C4 transverse processes with levator scapulae

Question 23

Iliocostalis is lateral/medial part of the erector spinae group?

Answer 23

Lateral

Question 24

Iliocostalis extends back to do what for posture?

Answer 24

Keep erect

Question 25

What are the components for iliocostalis?

Answer 25

Lumorum, thoracis, cervicis

Question 26

Iliocostalis origin?

Answer 26

Ilium and sacrum

Question 27

Iliocostalis insertion?

Answer 27

Most of the ribs

Question 28

Longissimus is upper/middle/lower portion of erctor spinae group?

Answer 28

Middle

Question 29

Longissimus components:

Answer 29

Thoracis, cervicis, capitis

Question 30

Longissimus origin?

Answer 30

Transversus processes and sacrum

Question 31

Longissimus insertion?

Answer 31

Most of ribs

Question 32

Spinalis origin

Answer 32

Spinous processes of T11-L2

Question 33

Spinalis insertion

Answer 33

Spinous processes of thoracic and lower cervical vertebrae

Question 34

Multifidus are a thick muscle mass best seen in region of the

Answer 34

Sacrum

Question 35

What are the 2 rotatores muscles and how many segments do they each span?

Answer 35

Long rotatores-spans 2 segments | Short rotatores-spans 1 segment

Question 36

What are the 2 intrinsic segmental muscles?

Answer 36

Interspinales and intertransversarii