Walls Of Thorax

Question 1

Main action of intercostal muscles

Answer 1

Prevent intercostal spaces being drawn in during inspiration and bulging outwards during expression

Question 2

The external intercostals, interchondral portions of the internal intercostals, and the levator costae may elevate the ribs during inspiration.

3 The internal intercostals except for the interchondral portions and the transversus thoracis may depress the ribs or cartilages during expiration

Answer 2

The external intercostals, interchondral portions of the internal intercostals, and the levator costae may elevate the ribs during inspiration.

3 The internal intercostals except for the interchondral portions and the transversus thoracis may depress the ribs or cartilages during expiration

Question 3

Typical intercostal nerves

Answer 3

3rd to 6th

Question 4

First two intercostal nerves also supply

Answer 4

Upper Limb and thorax

Question 5

7th to 11th intercostal nerves supply

Answer 5

Thorax and abdominal wall

Question 6

12th intercostal nerve supplies

Answer 6

Subcostal nerve,.. supplies abdominal wall and skin of buttock