Muscles of the Back

Question 1

Origin of extrinsic back muscles

Answer 1

Spinous processes

Question 2

Superficial layer function of extrinsic back muscles

Answer 2

Upper limb movement

Question 3

Intermediate layer function of extrinsic back muscles

Answer 3

Move ribs -> respiration

Question 4

Innervation of extrinsic back muscles

Answer 4

Anterior/ventral rami

Question 5

Innervation of trapezius

Answer 5

Spinal accessory nerve (motor)
C3-C4 roots (sensory)

Question 6

Function of trapezius

Answer 6

Adduction of scapula (retraction), rotate scapula upward

Question 7

Function of latissimus dorsi

Answer 7

Adduct, medially rotate, and extend arm at the glenohumeral joint

Question 8

Support of latissimus dorsi

Answer 8

Innervation: Thoracodorsal nerve
Blood supply: thoracodorsal artery

Question 9

Support of levator scapulae and rhomboids

Answer 9

Innervation: dorsal scapular nerve
Blood supply: deep branch of transverse cervical artery

Question 10

What are the borders of the triangle of auscultation?

Answer 10

Trapezius, latissimus dorsi, teres major

Question 11

Lumbar triangle -> what occurs here?

Answer 11

Petit’s hernia

Question 12

Function: serratus muscles

Answer 12

Respiratory functions

Question 13

Innervation of serratus muscle group

Answer 13

Anterior/ventral rami

Question 14

Innervation of deep back musculature?

Answer 14

Dorsal rami

Question 15

Function of thoracolumbar fascia?

Answer 15

Retinaculum preventing dorsal protrusion of muscles upon contraction, also attachment for transverse abdominis mm.

Question 16

Where does thoracolumbar fascia attach?

Answer 16

Medially -> spine of vertebrae
Laterally -> transverse processes
Inferiorly -> lower border of 12th rib
Superiorly -> continuous with deep fascia of neck

Question 17

Splenius capitis muscle action

Answer 17

Arm extension, medial rotation, adduction

Question 18

Splenius capitis and splenius cervicis support

Answer 18

Superficial branch of transverse cervical artery, dorsal rami

Question 19

Erector spinae acronym

Answer 19

I love squidward
Iliocostalis, longissimus, spinalis

Question 20

Transversospinal group function

Answer 20

Bilateral - extend vertebrae
Unilateral - rotate vertebrae above to opposite side

Question 21

What composes of the transversospinal group?

Answer 21

Semispinalis, multifidus, rotatores

Question 22

What is another name for the posterior ramus of C2

Answer 22

Greater occipital nerve

Question 23

Contents of the suboccipital triangle

Answer 23

Obliquus capitis superior and inferior muscle, rectus capititis posterior major and minor muscle, vertebral artery, suboccipital nerve (C1)

Question 24

What innervates suboccipital triangle?

Answer 24

Suboccipital nerve

Question 25

What supplies suboccipital triangle?

Answer 25

Vertebral artery

Question 26

Roof of suboccipital triangle?

Answer 26

Semispinalis capitis

Question 27

Floor of suboccipital triangle

Answer 27

Posterior arch of atlas, posterior altanto-occipital membrane

Question 28

Compression of spinal nerve will impact which type of muscles

Answer 28

Deep back and extrinsic (both dorsal and ventral rami impacted)

Question 29

Which muscle does the greater occipital nerve pass through?

Answer 29

Semispinalis capitis muscle

Question 30

What intercostal space is located deep to triangle of auscultation?

Answer 30

6th intercostal space

Question 31

How many vertebrae does multifidus span?

Answer 31

2-4 vertebrae

Question 32

How many vertebrae does semispinalis span?

Answer 32

4-6 vertebrae

Question 33

How many vertebrae does rotatores span?

Answer 33

1-2 vertebrae