NCBTMB Anatomy and Kinesiology 4

Question 1

Which structure forms the floor of the popliteal fossa?

Accepted Answer

Popliteus and posterior capsule of the knee

Answer

The floor of the popliteal fossa is formed by the popliteal surface of the femur, the posterior knee capsule, and the popliteus muscle.

Question 2

What is the open-pack (resting) position of the glenohumeral joint?

Accepted Answer

55° abduction and 30° horizontal adduction

Answer

The resting (open-pack) position of the glenohumeral joint is approximately 55° of abduction with 30° of horizontal adduction, where the joint capsule is most lax.

Question 3

The sciatic nerve is formed by contributions from which spinal levels?

Accepted Answer

L4–S3

Answer

The sciatic nerve is the largest nerve in the body and is formed from spinal levels L4 through S3 via the sacral plexus.

Question 4

Which anatomical landmark is used to identify the level of the sternal angle (angle of Louis)?

Accepted Answer

Rib 2 articulation

Answer

The sternal angle (angle of Louis) is the junction of the manubrium and body of the sternum and corresponds to the articulation of the second rib.

Question 5

Which muscle performs the action of 'unlocking' the fully extended knee to allow flexion to begin?

Accepted Answer

Popliteus

Answer

The popliteus unlocks the knee from its screwed-home position by internally rotating the tibia on the femur, initiating knee flexion.

NCBTMB Exam Practice Test

NCBTMB Exam Practice Test

NCBTMB Anatomy and Kinesiology 4