muscles

Question 1

what are the three abdominal muscles?

Answer 1

1. rectus abdominis
2. external oblique
3. internal oblique

Question 2

what are the three breathing muscles?

Answer 2

1. diaphragm (not shown on cadaver)
2. external intercostals
3. internal intercostals (will be the cut)

Question 3

what are the three erector spine muscles?

Answer 3

1. iliocostalis
2. longissimus
3. spinalis

Question 4

O.I.A. of rectus abdominis?

Answer 4

O. pubic symphysis
I. xiphoid process & costal cartilages
A. compresses abdomen and flexes vertebral column

Question 5

O.I.A of external oblique?

Answer 5

O. outer surface of lower 8 ribs
I. linea alba
A. compresses the abdomen, flexes the vertebral column LATERALLY

Question 6

O.I.A of internal oblique

Answer 6

O. iliac crest
I. linea alba
A. compresses the abdomen, flexes the vertebral column LATERALLY

Question 7

O.I.A of diaphragm

Answer 7

O. bottom of rib cage, sternum, and lumbar vertebrae
I. central tendon
A. inspiration

Question 8

O.I.A of external intercostals

Answer 8

O. inferior border of rib above
I. superior border of rib below
A. inspiration

Question 9

O.I.A of internal intercostals

Answer 9

O. superior border of rib below
I. inferior border of rib above
A. forced expiration

Question 10

O.I.A of iliocostalis

Answer 10

O. iliac crest
I. ribs
A. extend vertebral column

Question 11

O.I.A of longissimus

Answer 11

O. transverse process of lumbar vertebrae
I. transverse process of thoracic vertebrae
A. extend vertebral column

Question 12

O.I.A of spinalis

Answer 12

O. spinous processes of upper lumbar and lower thoracic vertebrae
I. spinous process of upper thoracic vertebrae
A. extend vertebral column

Question 13

what groups of muscles action is all “extends the vertebral column?”

a. abdominal
b. breathing
c. erector spinae

Answer 13

c. erector spinae

Question 14

hi, i originate from the bottom of the rib cage, sternum and lumbar vertebrae, insert of the central tendon, and my action is to inspirate… which muscle am i?

Answer 14

i am the diaphragm! fun fact: i cannot be shown on the cadaver so make sure to memorize my OIAs!

Question 15

i am on the anterior side of the body and i insert on the pubic symphysis, insert on the xiphoid process and costal cartilages and i compress the abdomen and flex the vertebral column… who am i?

Answer 15

i am the rectus abdominis! body builder like to show me off with their 6-packs!

Question 16

i originate on the inferior border of the rib above, insert on the superior border of the rib below and i aid in inspiration… who am i?

Answer 16

i am the external intercostals… please don’t confuse me with my twin the internal intercostals whose O and I’s are mine flipped

Question 17

i am the most medial on the posterior side, and i can be seen on the spine, who am i?

Answer 17

i am the spinalis!

Question 18

I am located on the posterior side but i am located most laterally, who am i?

Answer 18

i am the iliocostalis!