OCC Anatomy & Physiology Relevant to Casting 3

Question 1

Which nerve is at risk of injury when the cast padding is applied too tightly over the medial epicondyle of the humerus?

Accepted Answer

Ulnar nerve

Answer

The ulnar nerve passes through the cubital tunnel posterior to the medial epicondyle and is highly susceptible to pressure injury there.

Question 2

In Volkmann's ischemic contracture, which muscle group is primarily affected due to compartment syndrome of the forearm?

Accepted Answer

Deep flexors of the forearm

Answer

The deep flexor compartment of the forearm has the highest tissue pressure in forearm compartment syndrome, leading to ischemia and fibrosis of the flexor digitorum profundus and flexor pollicis longus.

Question 3

Which bone in the wrist is most commonly fractured and sits between the radius and the capitate?

Accepted Answer

Scaphoid

Answer

The scaphoid is the most commonly fractured carpal bone, articulating proximally with the radius and distally with the capitate.

Question 4

The deltoid ligament of the ankle is located on which side and resists which movement?

Accepted Answer

Medial side; resists eversion

Answer

The deltoid ligament is a strong medial ligament complex that resists excessive eversion of the ankle.

Question 5

Which layer of the skin, composed of dead keratinized cells, acts as the outermost protective barrier and must be protected during cast application?

Accepted Answer

Stratum corneum

Answer

The stratum corneum is the outermost, waterproof layer of the epidermis made of dead keratinized cells that protect deeper tissues.

(OCC) Orthopedic Casting Certification Practice Test

(OCC) Orthopedic Casting Certification Practice Test

OCC Anatomy & Physiology Relevant to Casting 3