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Defined as appendages to skin:

   hair, arrector pili muscle, sebaceous glands, nails, sweat glands.

Pilosebaceous apparatus

3 types identified:

  -lanugo, vellus, terminal

Phases of hair growth:

  -Anagen

  -Catagen

  -Telogen

Arrector pili muscle

  -Creates ‘gooseflesh' known as cutis anserine

Sebaceous gland

-May be unilobular or multilobular

-Sebum secretion is ‘holocrine’ process

-Gland function influenced by hormones