Muscles Of Respiration & abdominal

Question 1

External Intercostals

Answer 1

• Origin: in between ribs
• Insertion: in between ribs
• Action: elevate ribs (inhale)

Question 2

Internal intercostals

Answer 2

• Origin: in between ribs
• Insertion: in between ribs
• Action: depress ribs (exhale)

Question 3

Diaphragm

Answer 3

• Origin: inferior surface of rib cage
• Insertion: central tendon
• Action: Change volume of thoracic cavity (breathing)

Question 4

Rectus Abdominis

Answer 4

• Origin: pubic bone
• Insertion: sternum, ribs 5-7
• Action: compression of abdominal wall

Question 5

Transverse abdominis

Answer 5

• Origin: iliac crest
• Insertion: pubic bone
• Action: compression of abdominal wall

Question 6

External oblique

Answer 6

• Origin: lower 8 ribs
• Insertion: iliac crest
• Action: compression of abdominal wall

Question 7

Internal oblique

Answer 7

• Origin: iliac crest
• Insertion: last 3 ribs
• Action: compression of abdominal wall