Skin
Appendages -- epidermal derivatives such as hair follicles,
glands, etc. whose distribution, arrangement, and structural details
vary greatly in skin on different parts of the body.
Examine several hair follicles cut
transversely on slides 17 and
36.
In the hair shaft itself, identify if
possible the
- Medulla,
- Cortex, and
- Cuticle (Fig. 18-13).
- Not all layers may be evident,
depending on the plane of section.
- Identify the internal and external
root sheathes of the follicle.
![](../images/hari2.jpg)
Examine hair follicles cut
longitudinally on slide 67 and
slide 51, and again identifying as
many layers as possible. Identify
- Sebaceous glands (Fig.
18-15),
pictured to the right, and
- Arrector pili muscle (Fig.
18-12)
associated with hair follicles.
What type of muscle is the
arrector pili muscle?
How do hairs, sebaceous glands,
and arrector pili muscles contribute the functions of skin?
What is the mode of secretion
of sebaceous glands and why do they stain poorly?
More on skin
appendages. |