NCBTMB Anatomy and Kinesiology 3

Question 1

Which layer of the skin contains the keratinocytes undergoing active mitosis?

Accepted Answer

Stratum basale

Answer

The stratum basale (basal layer) contains mitotically active keratinocytes that continuously replenish the upper skin layers.

Question 2

The brachial plexus is formed from which spinal cord levels?

Accepted Answer

C5–T1

Answer

The brachial plexus originates from ventral rami of C5 through T1 and provides all motor and sensory innervation to the upper extremity.

Question 3

During the stance phase of gait, which muscle prevents the pelvis from dropping on the swing-leg side?

Accepted Answer

Gluteus medius

Answer

The gluteus medius on the stance-leg side contracts eccentrically to stabilize the pelvis and prevent a contralateral Trendelenburg drop.

Question 4

Which spinal curve is considered a primary curve present at birth?

Accepted Answer

Thoracic kyphosis

Answer

The thoracic and sacral kyphotic curves are primary curves present from fetal development, while cervical and lumbar lordoses develop postnatally.

Question 5

The rotator cuff is composed of which four muscles?

Accepted Answer

Supraspinatus, infraspinatus, teres minor, subscapularis

Answer

The rotator cuff consists of supraspinatus, infraspinatus, teres minor, and subscapularis, remembered by the mnemonic SITS.

NCBTMB Exam Practice Test