CCEP Anatomy & Biomechanics of Extremities

Question 1

Which muscle group is primarily responsible for shoulder abduction?

Accepted Answer

Deltoid (middle part)

Answer

The deltoid muscle, specifically its middle (acromial) part, is the primary muscle responsible for shoulder abduction, which is the movement of lifting the arm away from the body. While other muscles assist, the middle deltoid provides the main force for this action. Its strategic position allows it to effectively pull the humerus laterally.

Question 2

What is the role of the rotator cuff in the shoulder?

Accepted Answer

Stabilizing the shoulder joint

Answer

The rotator cuff is a group of four muscles and their tendons that surround the shoulder joint. Their collective and most crucial role is to provide dynamic stability to the highly mobile glenohumeral joint. By keeping the head of the humerus centered within the shallow glenoid fossa, the rotator cuff muscles prevent dislocation and allow for a wide range of controlled movements.

Question 3

Which of the following muscles is responsible for knee extension?

Accepted Answer

Quadriceps femoris

Answer

The quadriceps femoris is a large, powerful muscle group located on the anterior (front) aspect of the thigh, consisting of four distinct muscles. Its primary function is to extend the knee joint, straightening the leg. This action is essential for activities such as standing, walking, running, and jumping.

Question 4

What is the primary function of the iliotibial band (ITB)?

Accepted Answer

Stabilizing the lateral aspect of the knee

Answer

The iliotibial band (ITB) is a thick, fibrous band of fascia that runs along the lateral (outer) aspect of the thigh, from the hip to the tibia below the knee. Its primary function is to provide crucial lateral stability to the knee joint. It helps prevent excessive adduction and internal rotation of the femur, especially during weight-bearing activities.

Question 5

Which ligament prevents hyperextension of the knee?

Accepted Answer

Posterior cruciate ligament (PCL)

Answer

The posterior cruciate ligament (PCL) is one of the four major ligaments within the knee joint, located deep inside. Its primary function is to prevent the tibia from displacing too far posteriorly (backward) relative to the femur. It also acts as a crucial restraint against hyperextension of the knee, protecting the joint from excessive backward bending.

(CCEP) Certified Chiropractic Extremity Practitioner Practice Test

(CCEP) Certified Chiropractic Extremity Practitioner Practice Test

CCEP Anatomy & Biomechanics of Extremities