Muscle Anatomy: Muscle Walls of Trunk

Question 1

What are oblique and rectus muscles

Answer 1

Oblique muscles lie at an angle to the body axis

Rectus muscles lie parallel to the body axis

Question 2

What muscles are the oblique group made up of?

Answer 2

Thoracic region, abdominal region and transversus abdominis

Question 3

What muscles make up the thoracic region?

Answer 3

External intercostals and internal intercostals

Question 4

Where do external intercostals originate?

Answer 4

Inferior border of each rib

Question 5

Where is the insertion of external intercostals?

Answer 5

Superior border of more inferior rib

Question 6

What action do the external intercostals do?

Answer 6

Elevate ribs

Question 7

Where do the internal intercostals originate?

Answer 7

Superior border of each rib

Question 8

Where is the insertion of the internal intercostals?

Answer 8

Inferior border of the adjacent superior rib

Question 9

What action does the internal intercostals do?

Answer 9

Depress ribs

Question 10

What muscles make up the abdominal region?

Answer 10

External oblique and internal oblique

Question 11

Where does the external oblique originate?

Answer 11

External and inferior borders of ribs 5-12

Question 12

Where is the insertion of the external oblique?

Answer 12

Linea alba and iliac crest

Question 13

What action does the external oblique perform?

Answer 13

Compresses abdomen; depress ribs, flex or bend vertebral column

Question 14

Where does the internal oblique originate?

Answer 14

Lumbodorsal fascia and iliac crest

Question 15

Where is the insertion of the internal onlique?

Answer 15

Inferior ribs, xi[hoid process and linea alba

Question 16

What action does the internal oblique perform?

Answer 16

Compress abdomen, depress ribs, flex or bend vertebral column

Question 17

Where does the transversus abdominis originate?

Answer 17

Cartilages of ribs 6-12, iliac crest, and lumbodorsal fascia

Question 18

Where is the insertion of the transversus abdominis?

Answer 18

Linea alba and pubis

Question 19

What action does the transversus abdominis perform?

Answer 19

Compress abdomen

Question 20

What is the linea alba?

Answer 20

Tendinous band that runs along the anterior midline

Question 21

What is the muscle that is an example of a rectus muscle?

Answer 21

Rectus abdominis

Question 22

Where does the rectus abdominis originate?

Answer 22

Superior surface of the oubis near the symphysis

Question 23

Where is the insertion of the rectus abdominis?

Answer 23

Inferior surfaces of costal cartilages (ribs 5-7) and xiphoid process

Question 24

What action does the rectus abdominis perform?

Answer 24

Depress ribs, flex vertebral column, compress abdomen