Page 477 - Atlas of Histology with Functional Correlations

called the arrector pili muscles (5). Also associated with hair follicles (8) are

numerous sebaceous glands (6).

Found in the reticular layer (12) of the dermis (14) are cross sections of a
coiled portion of the sweat gland (7). The elongated portions of the sweat gland
(7) that continue to the surface of the skin are the excretory ducts of the sweat
glands (4, 7a). The more circular and deeper-lying parts of the sweat gland are

the secretory (7b) portions of the sweat gland (7).

FIGURE 12.2 ■ Thin skin: epidermis and the contents of the dermis. Stain:
Masson trichrome (blue stain). Low magnification.

FIGURE 12.3 | Skin: Epidermis, Dermis, and

Hypodermis in Scalp

This low-magnification section of the thin skin of the scalp illustrates both the

epidermis and dermis and some skin derivatives in the deeper connective tissue
layers. The epidermis stains darker than the underlying dermis connective tissue.
Visible in the epidermis are the cell layers stratum corneum (1), with
desquamating superficial cells; the stratum spinosum (2); and the basal cell
layer, the stratum basale (3), with brown melanin (pigment) granules (3).

The connective tissue dermal papillae (4) indent the underside of the
epidermis. A thin connective tissue papillary layer of the dermis is located
immediately inferior to the epidermis. The thicker connective tissue reticular
layer (12) of the dermis extends from just below the epidermis to the

476