CPE Anatomy & Physiology of Hair Growth 2

Question 1

Which layer of the hair follicle produces the Henle and Huxley layers of the inner root sheath?

Accepted Answer

Matrix cells surrounding the papilla

Answer

Matrix cells adjacent to the dermal papilla differentiate upward to form the inner root sheath layers including Henle's and Huxley's layers.

Question 2

What is the term for the club-shaped structure formed at the base of a hair during catagen that anchors it until it sheds?

Accepted Answer

Club hair

Answer

During catagen, the lower follicle regresses and the hair forms a club-shaped base called a club hair, which remains anchored until telogen ends.

Question 3

The arrector pili muscle originates in the dermis and inserts into the:

Accepted Answer

Outer root sheath of the follicle

Answer

The arrector pili originates in the papillary dermis and inserts into the outer root sheath of the hair follicle, causing the hair to stand erect when contracted.

Question 4

During which phase of hair growth does mitotic activity in the matrix cells cease?

Accepted Answer

Catagen

Answer

At the onset of catagen, matrix cell mitosis stops, triggering apoptosis and follicle regression.

Question 5

Which type of hair is characteristically unpigmented, fine, and covers the fetus in utero?

Accepted Answer

Lanugo

Answer

Lanugo hair is the first hair produced by fetal follicles; it is fine, soft, and lacks pigment, and is shed before or shortly after birth.

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CPE Anatomy & Physiology of Hair Growth 2