Hair and Nail Structure Functions

The video explores the derivatives of the epidermis, focusing on hair, hair follicles, and nails. It explains how these structures are extensions of the epidermis into the dermis. The anatomy of hair follicles, including the erector pilli muscle and the process of hair growth and pigmentation, is detailed. The video also distinguishes between terminal and vellus hair. The structure and growth of nails are discussed, highlighting similarities with hair follicles.

What does it mean for a structure to be a derivative of the epidermis?

• It is only found on the surface of the skin.

• It is made of dermal tissue.

• It is a separate structure from the epidermis.

• It is an extension of the epidermis into the dermis.

What is the function of the erector pili muscle?

• To form the outer layer of the hair.

• To cause the hair to stand on end.

• To produce hair color.

• To supply blood to the hair follicle.

What is the role of the matrix in the hair follicle?

• To store nutrients for the hair.

• To rapidly divide and produce new hair cells.

• To produce pigment for hair color.

• To protect the hair from damage.

Which part of the hair is responsible for its color?

• The medulla.

• The cortex.

• The melanocytes in the matrix.

• The cuticle.

What is the main difference between terminal and vellus hair?

• Vellus hair grows faster than terminal hair.

• Terminal hair is found only on the head.

• Vellus hair is thicker than terminal hair.

• Terminal hair is pigmented, while vellus hair is not.

What is the function of the cuticle in hair?

• To provide color to the hair.

• To encase and protect the hair.

• To supply nutrients to the hair.

• To anchor the hair to the follicle.

What is the proximal nail fold?

• The epithelial tissue at the base of the nail.

• The part of the nail that extends beyond the finger.

• The area where the nail is attached to the finger.

• The visible part of the nail.

Where is the nail matrix located?

• Under the nail plate.

• At the tip of the nail.

• On the sides of the nail.

• On the surface of the nail.

How is the nail bed similar to the hair follicle?

• Both are extensions of epithelial tissue into the dermis.

• Both are made of connective tissue.

• Both produce pigment for color.

• Both are involved in the immune response.

What is the role of the nail matrix?

• To produce new keratinocytes for nail growth.

• To anchor the nail to the finger.

• To provide nutrients to the nail.

• To protect the nail from damage.