Thoracic Muscles

Question 0

External intercostals

Answer 0

PA: inferior edge of superior rib to the superior surface of the rib below

I: intercostals

A: respiration; most active during inhalation

Question 1

Diaphragm

Answer 1

PA: SP: xiphoid process
CP: inner surface of ribs
LP: ant. Surface of 1-3 lumber vertebrae

I: phrenic nerve (c3-5)
Sensory innervation of IC nerves t7-12

A: primary muscle for respiration

Question 2

Internal intercostals

Answer 2

PA: passes between the most inferior lateral edge of the costal grooves of ribs above, to the superior surface of ribs below

I: intercostals

A: respiration; forceful expiration

Question 3

Innermost intercostals

Answer 3

Attached to the internal surfaces of the adjacent ribs along the medial edge of the costal grooves

I: intercostals

A: respiration