Dr. Mareb.H.Ahmad
Histology Department
Faculty of Medicine
The Skin
1.
Definition
2.
Functions
3.
Structure
4.
Origin
5.
Types
6.
Thick skin
7.
Thin skin
8.
Differences between thick and thin skin
9.
Other Cells of Epidermis
10. Skin Appendages
Dr Mareb Hamed 2016
Thick skin
Dr Mareb Hamed 2016
Several types of sensory skin nerve endings.
Dr Mareb Hamed 2016
Dr Mareb Hamed 2016
Melanocyte.
-Processes extend between
keratinocytes.
Dr Mareb Hamed 2016
Dr Mareb Hamed 2016
Sweat gland (simple coiled tubular gland).
Dr Mareb Hamed 2016
Sweat gland.
Dr Mareb Hamed 2016
Sebaceous
gland.
Dr Mareb Hamed 2016
Hair follicle.
•Bulbous terminal expansion with a dermal
papilla.
•The papilla contains
capillaries
and is
covered by cells forming
hair root
and
develop into
hair shaft
.
•Cells producing
medulla
are central (A).
•Cells producing
cortex
are lateral (B).
•Cells producing
cuticle
are next layer (C).
•Cells producing
internal and external root
sheaths
are peripheral
.
•External root sheath
is continuous with
epidermis.
•Internal root sheath
disappear at openings
of sebaceous gland ducts.
Dr Mareb Hamed 2016
•Relationships between skin, hair
follicle, arrector pili muscle, and
sebaceous and sweat glands.
Dr Mareb Hamed 2016