Back Muscles

Question 1

what are the three groups of back muscles

Answer 1

superficial back
intermediate back
deep back

Question 2

what do superficial back muscles actually control?

Answer 2

produce and control shoulder/limb movements

Question 3

name the four superficial back muscles

Answer 3

trapezius
lattisimus dorsi
levator scapulae
rhomboids

Question 4

what is the action of the latissimus dorsi?

Answer 4

extends adducts and medially rotates the humerus

Question 5

where does the latissimus dorsi insert?

Answer 5

intertubercular sulcus of the humerus

Question 6

what is the innervation of the latissimus dorsi?

Answer 6

thoracodorsal nerve from ventral rami of C678

Question 7

what is the insertion of the trapezius muscle? 3 sites

Answer 7

clavicle, acromion and spine of scapula

Question 8

what is the action of the trapezius?

Answer 8

elevated rotates and retracts the scapula

Question 9

what is the innervation of the trapezius?

Answer 9

11th cranial nerve…spinal accessory nerve

Question 10

name the two intermediate muscles of the back

Answer 10

serratus posterior superior

serratus posterior inferior

Question 11

what are the three layers of the deep back muscles

Answer 11

superficial intrinsic
intermediate intrinsic
deepest intrinsic

Question 12

what is the muscle in the superficial intrinsic layer of the deep muscles of the back?

Answer 12

splenius muscles

Question 13

what is the muscle in the intermediate intrinsic layer of the deep muscles of the back?

Answer 13

erector spinae

Question 14

what is the muscle in the deepest intrinsic layer of the deep muscles of the back?

Answer 14

transversospinalis

Question 15

the erector spinae is divided into three muscle masses…name them

Answer 15

iliocostalis
longissimus
spinalis

Question 16

where is the iliocostalis located in the back?

Answer 16

most lateral intermediate intrinsic muscle of the deep back muscles

Question 17

where is the longissimus located in the back?

Answer 17

middle intermediate intrinsic muscle of the deep back muscles

Question 18

where is the spinalis located in the back?

Answer 18

most medial intermediate intrinsic muscle of the deep back muscles

Question 19

what are the muscles of the erector spinae group innervated by/

Answer 19

dorsal rami

Question 20

what is the role of the erector spinae muscles?

Answer 20

postural muscles for extension and stabilization

Question 21

name the three divisions the spinalis muscles

Answer 21

semispinalis
multifidus
rotatores

Question 22

what is the innervation of the spinalis muscles

Answer 22

dorsal rami

Question 23

what is the action of the spinalis muscles?

Answer 23

postural rotational help

Question 24

name the superficial spinalis muscle

Answer 24

semispinalis

Question 25

name the intermediate spinalis muscle

Answer 25

multifudus

Question 26

name the deep spinalis muscle

Answer 26

rotatores