Thoracic Wall

Question 1

What makes up the axial skeleton?

Answer 1

Skull, ribs, sternum, sacrum, and coccyx

Question 2

What makes up the appendicular skeleton?

Answer 2

Upper limbs, lower limbs (Shoulder girdle and hipbones)

Question 3

Which are the True, False, and Floating ribs?

Answer 3

True: 1-7 (Has their own hyaline cartilage)
False: 8-10 (Merges with hyaline cartilage of rib 7 to form the Costal Margin)
Floating: 11-12

Question 4

What are the layers of the Intercostal Muscles?

Answer 4

External, Internal, and Innermost (All innervated by intercostal nerves)

Question 5

Describe the Intercostal Neuromuscular Bundle.

Answer 5

From superior to inferior (In costal groove)… Vein, Artery, Nerve “VAN.” This branches to form the Collateral Branch (NAV).

Question 6

Trace the blood supply to Thoracic Wall (arteries only).

Answer 6

-Thoracic aorta (Posterior to intercostals) –> Posterior intercostal aa.
^^^ anastomosis ∨∨∨
-Internal thoracic aa. –> Anterior intercostal aa.

Question 7

Trace the venous system in the Thoracic Wall.

Answer 7

• Posterior intercostal veins –> Azygos system –> SVC

- Internal thoracic veins –> Brachiocephalic veins –> SVC