Muscles of the back

Question 1

What are the extrinisc back muscles innervated by?

Answer 1

ventral rami

Question 2

Origin of the trapezius muscle?

Answer 2

Superior nuchal line,

Question 3

insertion of the trapezius muscle?

Answer 3

1/3 clavicle, acromion, spine of scapula

Question 4

Action of the trapezius?

Answer 4

elevates, retracts, depresses, rotates scapula

Question 5

Innervation of the trapezius muscle?

Answer 5

accesory nerve

Question 6

Describe shoulder syndrome?

Answer 6

weakness/paralysis of trapezius (can lead to further strain on cervical vertebrae

Question 7

Origin of the latissimus dorsi?

Answer 7

spinous process of T7-T12

Question 8

Insertion of the latissimus dorsi?

Answer 8

floor of groove of humerus

Question 9

Action of the lats?

Answer 9

extends, adducts, medially rotates humerus

Question 10

Innervation of lats?

Answer 10

thoracodorsal nerve

Question 11

Origin of the levator scapulae?

Answer 11

tubercles of trasverse process of cervicial nerves

Question 12

Insertion of the levator scapulae?

Answer 12

superior part of medial border of scapula

Question 13

Action of the levator scapulae?

Answer 13

elevates scapula

Question 14

Origin of the rhomboids?

Answer 14

minor: nuchal ligaments and process of cervical
Major: spinous process of thoracic

Question 15

insertion of the rhomboids?

Answer 15

medial border of scapula

Question 16

Action of the rhomboids?

Answer 16

retract and rotate scapula

Question 17

Innervation of the rhomboids?

Answer 17

dorsal scapular nerve

Question 18

Origin of the serratus posterior superior?

Answer 18

nuchal ligament, spinous process of cervical

Question 19

insertion of the serratus posterior superior?

Answer 19

superior border of ribs 2-5

Question 20

Action of the serratus posterior superior?

Answer 20

proprioception, elevates upper ribs

Question 21

Innervation of serratus posterior superior?

Answer 21

intercostal nerves 2-5

Question 22

origin of the serratus posterior inferior?

Answer 22

spinous process of T11-L2

Question 23

Insertion of the serratus posterior inferior?

Answer 23

inferior borders of ribs 8-12

Question 24

action of the serratus posterior inferior?

Answer 24

proprioception

Question 25

innervation of the serratus posterior interior?

Answer 25

intercostal nerves 9-12

Question 26

what are the intrinisc back muscles innervated by?

Answer 26

dorsal rami

Question 27

Origin of splenius?

Answer 27

nuchal ligament

Question 28

insertion of the splenius?

Answer 28

Mastoid process and lateral 1/3 nuchal ligament, splenius cervicis

Question 29

action of the splenius?

Answer 29

bilateral contraction

Question 30

Innervation of the splenius?

Answer 30

dorsal rami

Question 31

Origin of erector spinae?

Answer 31

posterior iliac crest

Question 32

Action of the erector spinae?

Answer 32

act bilaterally to extend the vertebral column

Question 33

Innervation of the erector spinae?

Answer 33

dorsal rami

Question 34

Problem with erector spinae?

Answer 34

susceptable to strain?

Question 35

the benefit of identifying back dimples?

Answer 35

easier to find sacral triangle and sacral hiatus

Question 36

benefit of a triangle of ausculation?

Answer 36

good site for the stethoscope placement