Muscles of Respiration

Question 1

What is the origin of the central tendon?

Answer 1

Apex of the diaphragm

Question 2

What is the insertion of the central tendon?

Answer 2

Apex of the diaphragm

Question 3

What is the function of the central tendon?

Answer 3

Holds muscle together

Question 4

What is the origin of the diaphragm?

Answer 4

Xiphoid process, lower ribs

Question 5

What is the insertion of the diaphragm?

Answer 5

Central tendon (on the center of the diaphragm)

Question 6

What is the function of the diaphragm?

Answer 6

Contraction flattens the muscle and increases the volume of the thoracic cavity (inhalation). Relaxation causes the muscle to go back to normal curvature and decrease the volume of the thoracic cavity (exhalation).

Question 7

What is the origin/insertion of the external intercostal muscles?

Answer 7

Intercostal space

Question 8

What is the function of the external intercostal muscles?

Answer 8

Contractions increase the volume of the thoracic cavity (inspiration/inhalation); found between the ribs; runs ventral –> caudal

Question 9

What is the origin/insertion of the internal intercostal muscles?

Answer 9

Intercostal space

Question 10

What is the function of the internal intercostal muscles?

Answer 10

Contractions decrease the volume of the thoracic cavity (exhalation/expiration); found between the ribs; runs ventral –> cranial

Question 11

What is the origin of the tendons of the crura?

Answer 11

Upper lumbar vertebrae

Question 12

What is the insertion of the tendons of the crura?

Answer 12

Central tendon

Question 13

What is the function of the tendons of the crura?

Answer 13

Form tethers for contraction of the diaphragm