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Skin anatomy - Coggle Diagram
Skin anatomy
Normal Skin Anatomy
Majority of Epidermis is made up of:
keratinocytes
** The epidermis is avascular and receives its nutrition from the superficial vascular plexus of the papillary dermis.
also contains
melanocytes cells
Melanocytes are
derived from the neural crest
They are responsible for
producing the melanin family of pigments.
Melanocytes are found in
equal density
in all humans.
Melanocyte
cells are the
reason
for
color variation
among humans.
darker-skinned
individuals have a
higher
density of melanosomes than those with lighter skin.
Langerhans cells
Merkel cells
Continuity with digestive tract
The skin is found in continuity with the epithelial lining of the digestive tract, including the oral mucosa and the anal mucosa.
Distinct transition zones are seen at these interfaces.
The skin and its neighboring epithelial components supply the human body with a continuous barrier to protect it from the external world.
The skin also abuts the conjunctival mucosa of the globe and the mucosa of the nasal passages.
Appendages
Many
appendageal structures
are present throughout the
skin
and the
major ones
are:
the Hair Follicles
their associated
sebaceous glands
the Eccrine Glands.
Most of the skin is hair-bearing.
Fine vellus hairs make up the preponderance of the skin's hair production.
Terminal hairs are much thicker
thy are found on
the scalp
eyebrows and eyelashes
in the axilla and groin areas
and in the beard region in men.
Glabrous skin
: which is devoid of hair follicles.
includes
the vermilion border of the lips
the palms, the soles, the glans penis, and the labia minora