Anterolateral Abdominal Muscles (Quiz 2/Exam 2)

Question 1

What is the origin/proximal attachment of the external oblique?

Answer 1

external surfaces of ribs 5-12

Question 2

What is the largest anterolateral abdominal muscle?

Answer 2

external oblique

Question 3

What are the insertions/distal attachments of the external oblique?

Answer 3

-linea alba
-pubic tubercle
-anterior half of iliac crest

Question 4

What innervates the external oblique?

Answer 4

thoracoabdominal nerves and subcostal n.

Question 5

What are the actions of the external oblique?

Answer 5

-compresses and supports abdominal viscera
-flexes and rotates trunk

Question 6

What are the origins/proximal attachments for the internal oblique?

Answer 6

-thoracolumbar fascia
-anterior 2/3 of iliac crest
-lateral 3rd of inguinal ligament

Question 7

What are the insertions/distal attachments for the internal oblique?

Answer 7

-inferior border of ribs 10-12
-linea alba
-pectin pubis via conjoint tendon

Question 8

What innervates the internal oblique?

Answer 8

thoracoabdominal nerves

Question 9

What are the actions of the internal oblique?

Answer 9

-compresses and supports abdominal viscera
-flexes and rotates trunk

Question 10

What are the origins/proximal attachments for the transversus abdominis?

Answer 10

-internal surface of 7th-12th costal cartilages
-thoracolumbar fascia
-iliac crest
-lateral 3rd of inguinal ligament

Question 11

What are the insertions/distal attachments of the transversus abdominis?

Answer 11

-linea alba with aponeurosis of internal oblique
-pubic crest
-pectin pubis via conjoint tendon

Question 12

What innervates the transversus abdominis?

Answer 12

thoracoabdominal nerves

Question 13

What are the actions of the transversus abdominis?

Answer 13

compresses and supports abdominal viscera

Question 14

What is the origin/proximal attachment for the rectus abdominis?

Answer 14

pubic symphysis and pubic crest

Question 15

What is the insertion/distal attachment for the rectus abdominis?

Answer 15

xiphoid process and 5th-7th costal cartilages

Question 16

What innervates the rectus abdominis?

Answer 16

thoracoabdominal nerves

Question 17

What are the actions of the rectus abdominis?

Answer 17

-flexes trunk (lumbar vertebrae) and compresses abdominal viscera
-stabilizes and controls tilt of pelvis (antilordosis, helps prevent hyperlordosis)

Question 18

Which abdominal muscle is absent in 20% of the population?

test q

Answer 18

pyramidalis

Question 19

What is the origin/proximal attachment of the pyramidalis?

Answer 19

linea alba

Question 20

What is the insertion/distal attachment for the pyramidalis?

Answer 20

anterior surface of the pubis and the anterior pubic ligament

Question 21

What innervates the pyramidalis?

Answer 21

thoracoabdominal nerves

Question 22

What is the action of the pyramidalis?

Answer 22

tenses linea alba

Question 23

The rectus abdominis muscle is enclosed in the rectus sheath and is divided right and left by the linea alba and transversely by the…..

Answer 23

tendinous intersections

Question 24

All the layers of the anterolateral muscles fuse at the….

test q

Answer 24

umbilicus

Question 25

The aponeurosis of the anterolateral abdominal muscles forms the _____________ rectus sheath and linea alba

Answer 25

anterior and posterior

Question 26

The external and internal oblique form which sheath?

Answer 26

rectus sheath

Question 27

The internal oblique and transversus abdominis form which sheath?

Answer 27

posterior rectus sheath

Question 28

The arcuate line demarcates the ________ rectus sheath and the transversalis fascia covering the inferior quarter

Answer 28

posterior

Question 29

Superiorly, the posterior rectus sheath continues as the.....

Answer 29

transversus thoracis m.

Question 30

The ________________ abdominis form a neurovascular plane of the anterolateral abdominal wall that contains nerves and arteries test q

Answer 30

internal and transversus

Question 31

The contralateral external and internal oblique muscles form a ____________, a 2 bellied muscle sharing a common central tendon that works as a unit

Answer 31

"digastric muscle"

Question 32

What are the 4 main functions of the anterolateral abdominal muscles?

Answer 32

1) combined action produces the force required for defecation, vomiting, child birth, and heavy lifting 2) supports the abdominal viscera and protect them from injuries 3) rectus abdominis is a powerful flexor of the thoracic wall 4) the oblique muscles assist in posture and movement of the trunk like rotation and flexion