CAT Anatomy & Kinesiology 3

Question 1

Which muscle group is primarily responsible for hip external rotation?

Accepted Answer

Deep six lateral rotators

Answer

The deep six lateral rotators (piriformis, obturator internus/externus, gemelli, quadratus femoris) are the primary hip external rotators.

Question 2

The tibialis anterior muscle performs which two primary actions at the ankle?

Accepted Answer

Dorsiflexion and inversion

Answer

The tibialis anterior dorsiflexes the foot and inverts it because of its attachment on the medial cuneiform and first metatarsal.

Question 3

Which of the following describes the origin of the biceps femoris long head?

Accepted Answer

Ischial tuberosity

Answer

The long head of the biceps femoris originates from the ischial tuberosity, making it a true two-joint muscle.

Question 4

During a push-up, the thoracic spine should ideally remain in which position?

Accepted Answer

Neutral with slight natural kyphosis

Answer

Maintaining neutral thoracic alignment with natural kyphosis protects spinal structures and optimizes force transfer.

Question 5

The subscapularis muscle performs which primary action at the shoulder?

Accepted Answer

Internal rotation

Answer

The subscapularis is the only rotator cuff muscle that internally rotates the humerus.

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