Lecture 26: Integument 2

Question 1

List the characteristics of sebaceous glands and both types of sudoriferous glands

Answer 1

Sebaceous: holocrine. Branched acinar glands w/ short ducts. Everywhere but palms and soles of feet. Continuously produce sebum- into hair follicle. Growth stimulated at puberty by sex hormones. Can lead to bacterial infection=pimple.

Sudoriferous: sweat
Merocrine-coiled, simple tubular secretory portions, duct system consists of stratified cuboidal epithelium except in dermis. Cholinergic endings.
Apocrine- found in labia,areolar, axillary,anal. Secretions thicker than merocrine. Opens into hair follicle. Adrenergic innervation. Inactive until puberty. Special types: cerumen. Glands of moll.

Question 2

Be able to identify sebasecous glands on photomicrographs.

Answer 2

K

Question 3

Describe the histological structure of a hair follicle including the hair bulb and both external and internal root sheaths.

Answer 3

Hair bulb: expanded in lower part of hair follicle. Matrix: produces hair shaft and inner and outer root sheaths. Vascularized dermal papilla.

External root sheath: down growth of epidermis.

Internal: generated by bulb matrix. Made of layers.

Question 4

Be able to identify types of sensory receptors on photomicrographs

Answer 4

K