Page 489 - Atlas of Histology with Functional Correlations

FIGURE 12.11 ■ Cross section and three-dimensional appearance of an eccrine
sweat gland. Stain: hematoxylin and eosin. Low magnification.

FUNCTIONAL CORRELATIONS 12.2 ■ Skin

Derivatives or Appendages

Nails, hairs, and sweat glands are derivatives of the skin that develop from
the downgrowth of the surface epithelium of the epidermis. During
development, these appendages grow into and reside deep within the

connective tissue of the dermis. Hairs are the hard, cornified, cylindrical
structures that arise from hair follicles in the skin. One portion of the hair
projects through the epithelium of the skin to the exterior; the other portion
remains in the dermis. Hair grows from the expanded portion at the base of
the hair follicle called the hair bulb, which consists of a matrix with

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