Chapter 12 Muscles Of Torso

Question 1

What muscle is the tendinous intersections located on?

Answer 1

Rectus abdominis

Question 2

What is the actions of the rectus abdominis?

Answer 2

Flexes vertebral column
Compresses abdomin to aid in defecation
Urination
Forces exhalation
Childbirth

Question 3

What action does the external obliques have when acting bilaterally?

Answer 3

Compresses abdomen

Flexes vertebral column

Question 4

What action does the external obliques have when acting singly?

Answer 4

Laterally flex vertebral column

Rotate vertebral column

Question 5

What is the action of the internal obliques?

Answer 5

Bilaterally compresses abdomen an flexes vertebral column

Acting singly laterally flexes an rotates vertebral column

Question 6

What muscle pulls twelfth rib inferiorly during forced exhalation?

Answer 6

Quadratus lumborum

Question 7

In RMA which muscle elevates the hip bone, commonly on one side?

Answer 7

Quadratus lumborum

Question 8

What muscle is nicknamed the “hip hiker” muscle?

Answer 8

Quadratus lumborum

Question 9

What are he three major openings of the diaphragm which pass between the thorax an abdomen

Answer 9

Aorta
Esophagus
Inferior vena cava

Question 10

What is the most important muscle that powers breathing?

Answer 10

The diaphragm

Question 11

What are he actions of the diaphragm?

Answer 11

Contraction causes flattening and increased vertical dimension of thoracic cavity for inhalation
Relaxation of diaphragm causes it to move superiorly an decreases the vertical of the thoracic cavity resulting in exhalation

Question 12

What two muscles are referred to as the pelvic diaphragm?

Answer 12

Levator ani

Ischiococcygeus