Chapter 11: Muscles of the Trunk

Question 1

What are the three Erector Spinae Muscles?

“true back muscles”

Answer 1

1. Iliocostalis
2. Longissimus
3. Spinalis

Question 2

the function of the erector spinae muscles

Answer 2

maintain posture, keep you upright, balance, extend trunk

Question 3

the attachment of the iliocostalis group

Answer 3

ilium of the pelvis

Question 4

insertion of the iliocostalis group

Answer 4

the angle or body of the rib all the way up the rib cage

Question 5

attachment of the longissimus group

Answer 5

fascia of the lumbar region, thiradorsal fascia or thoracolumbar fascia (triangle in the small of the back)

Question 6

Spinalis group attachment

Answer 6

thoracolumbar fascia

Question 7

spinoallis group insetion

Answer 7

the transverse process of on the length of the vertebral column

Question 8

inervation of the true back muscles

Answer 8

dorsal rami

Question 9

the functions of the deepest back muscles

Answer 9

extension, flextion, and rotation

Question 10

inervation of the deepest back muscles

Answer 10

dorsal rami

Question 11

intransverarii are located where?

Answer 11

between the transverse processes

Question 12

rotatores are located where?

Answer 12

attach to the spinous processes to the tranverse proccess of the one below

Question 13

multifidus are locted where?

Answer 13

the spinous processes of one vertebra to the transverse of the one after the one skipped below

Question 14

interspinales is locted where

Answer 14

in between spinous processes

Question 15

what is Lina Alba?

Answer 15

• tough, thick fibrous band that extends from the xiphoid processes to the pubic symphysis
• the central tendon, attachment of the oblique muscles
• thick because there are so many tendons attached (3 on each side)

Question 16

where are the rectus abdominals

Answer 16

• two on each side of the lina alba
• from the coastal cartilage to the pubic tubricals
• small tendons (tendonous intersections) perpandicular to the lina alba, inersect the muscle, giving the “8 pack” appearence

Question 17

explain the external oblique

Answer 17

the most superficial layer

• contain adoneurosis (sheet like tendon, borad attachment to lina alba)
• tissue adjacent to rectus

Question 18

explain internal oblique

Answer 18

• fibres run at oblique angles
• just internal to external oblique
• attaches to lina alba via it;s apondeurosis (which splits around the rectus)

Question 19

explain the transverse abd. muscles

Answer 19

• fibres run perpandicualar to the lina alba

- apondeurosis runs behind the rectus

Question 20

what is the ingenial ligament?

Answer 20

an extension of the oblique muscle

Question 21

the external fibre dirrection

Answer 21

toward the front pockets

-anteriorly, medially, inferiorly

Question 22

external inserect onto?

Answer 22

illiac crest, pubic symphsis

Question 23

the external originates from?

Answer 23

the costal cartilage

Question 24

the internal dirrect is:

Answer 24

toward the back pockerts

Question 25

the internal originates from?

Answer 25

the iliac crest and the lumbar vertebra

Question 26

the internal inserts onto?

Answer 26

costal region

Question 27

the transverse oringates?

Answer 27

costal region, lumbar vertbrae, iliac crest

Question 28

the transverse inserts onto?

Answer 28

the lina alba

Question 29

the function of the layes of abdominal side muscles

Answer 29

- trunk flexion, extension, rotation | - changes in abdominal pressure