Short Questions

Short Questions
SKIN

• Beginning at the surface, list the five layers
of epidermis. Compare keratinocytes in each
layer in terms of their cell shape, capacity for
division, staining properties and the visibility
of organelles.

• List the four cell types in the epidermis
and compare them in terms of
1. their origin,
2. number,
3. location,
4. binding structures and
5. primary function.

• List the steps of melanin synthesis.

• Define and explain Dopa
reaction.Describe how the melanin
granules enterkeratinocytes.

• Describe Langerhans’ cells in terms of
1. Shape.
2. Location.
3. Staining property.
4. Granules.
5. Immune function.

• Describe Merkel’s cell in terms of
1. The sites of most abundance.
2. Location in the skin.
3. The origin.
4. The shape.
5. EM
6. Their association with nerve endings.
7. Functions.

• Name the two layers of the dermis and
compare them.

• Name the types of sensory receptors
found in epidermis,dermal papillae and
reticular dermis.

• Enumerate causes of fixation of
epidermis to dermis.

• In a table form differentiate between
thin and thick skin.

• Describe histological features of hair
shaft/root.
• Describe histological features of hair
follicle.

• Compare the hardness of keratin in the
hair.(where is the soft and the hard
keratin).

• What is the difference between
follicular bulb and follicular bulge?

• Describe epidermal stem cells in terms
of site and functions.

• Describe sebaceous glands in terms of:
1. Type according to shape.
2. Association with hair follicle.
3. Site in which they occur without hair
follicles.
4. Mode of secretion
5. Functions.

• Describe sebaceous gland in terms of:
– Secretory part.
– Duct.

• Name the 2 sweat glands types and
compare them in terms of:
1. Type as regards the shape.
2. Distribution in skin.
3. Mode of secretion.
4. Composition of secretion.
5. Secretory part epithelium.
6. Excretory duct
7. Innervation.

• Name the type of epithelium that lines
the duct of sweat glands.

• What is meant by the following?:
1. Nail bed
2. Nail matrix
3. Proximal nail fold
4. eponychium .
5. Lunule:
6. Lateral nail folds

• Name the components of skin that play
a role in :
1. protection from Dehydration.
2. protection from Infection.
3. protection from uV rays.
4. Regulation of body temperature.
5. Sensory reception.
6. Excretion.

• define the following terms.:
– Albinism.
– Psoriasis.
– Linea graviderum.
– Glassy membrane.
– Birbeck’s granules.
– Melanosomes.
– Pheomelanin
– Acne.