CCEP Anatomy & Biomechanics of Extremities 3

Question 1

The flexor retinaculum of the ankle forms the roof of the tarsal tunnel; which nerve passes through this tunnel?

Accepted Answer

Posterior tibial nerve

Answer

The tarsal tunnel contains the posterior tibial nerve (along with the posterior tibial artery and flexor tendons), which divides into medial and lateral plantar nerves distally.

Question 2

The 'screw-home mechanism' of the knee involves which motion occurring at full extension?

Accepted Answer

External rotation of the tibia

Answer

As the knee reaches full extension, the tibia externally rotates (or the femur internally rotates) to lock the joint in the close-packed position.

Question 3

Which muscle of the rotator cuff contributes most to humeral head depression during overhead elevation?

Accepted Answer

All three — infraspinatus, teres minor, subscapularis equally

Answer

The infraspinatus, teres minor, and subscapularis collectively depress the humeral head and counteract the superior shear of the deltoid during elevation.

Question 4

The proximal radioulnar joint is classified as which type of synovial joint?

Accepted Answer

Pivot

Answer

The proximal radioulnar joint is a pivot (trochoid) joint where the radial head rotates within the annular ligament and the radial notch of the ulna.

Question 5

Tension in the plantar fascia increases with which motion and protects the medial longitudinal arch through the 'windlass mechanism'?

Accepted Answer

Dorsiflexion of the first MTP joint

Answer

Dorsiflexion of the first MTP joint tightens the plantar fascia like a windlass, raising the medial longitudinal arch and supinating the foot for push-off.

(CCEP) Certified Chiropractic Extremity Practitioner Practice Test

(CCEP) Certified Chiropractic Extremity Practitioner Practice Test

CCEP Anatomy & Biomechanics of Extremities 3