Page 498 - Atlas of Histology with Functional Correlations

Smooth muscles arrector pili attach to the papillary layer of the dermis and to

the sheath of the hair follicle
Contraction of the arrector pili muscle stands hair up and forces sebum into
the lumen of the hair follicle

Sweat Glands

Widely distributed in the skin and are of two types: eccrine and apocrine
Assist in temperature regulation and excretion of water, salts, and some
nitrogenous waste

Eccrine Sweat Glands

Are simple coiled glands located deep in the dermis in the skin of palms and
soles
Consist of clear and dark secretory cells and excretory duct

Clear cells secrete watery product, whereas dark cells secrete mainly mucus
Contractile myoepithelial cells surround only the secretory cells
Excretory duct is thin, dark staining, and lined by stratified cuboidal cells

Excretory duct ascends, straightens, and penetrates the epidermis to reach the
surface of the skin

Apocrine Sweat Glands

Found coiled in the deep dermis of the axilla, anus, and areolar regions of the
breast
Ducts of glands open into hair follicles
Lumina are wide and dilated, with low cuboidal epithelium

Contractile myoepithelial cells surround the secretory portion of the glands
Become functional at puberty when sex hormones are present
Secretion has an unpleasant odor after bacterial decomposition

Review Questions

QUESTIONS

In the following multiple choice questions, choose the letter corresponding

to the one best answer.

497