Histology Lab: Skin and Glands

Question 1

While observing a skin sample of a patient you observe the stratum lucidum. What type of skin are you most likely looking at?

Answer 1

Thick skin. Thin skin does not have a visible stratum lucidum.

Question 2

While observing a skin sample of a patient, you observe punctate staining near the stratum basale. What type of skin are you most likely looking at?

Answer 2

Thin skin.

Question 3

What are the different types of melanin?

Answer 3

Eumelanin = Brown, Pheomelanin = Red, Neuromelanin = Dark

Question 4

*Where does melanin tend to aggregate in the s. basale? Why?

Answer 4

Apical portion. It protects dividing cells from UV damage.

Question 5

What type of sweat gland secretes watery fluid with a little bit of protein?

Answer 5

Eccrine glands

Question 6

What type of sweat gland in the armpit and groin secretes more proteinaceous fluid?

Answer 6

Apocrine glands

Question 7

*What are the arrows pointing to?

Answer 7

The far left arrow is pointing to larger, lighter staining secretory cells surrounded by myoepithelial cells. The top arrow is pointing to the ducts of the sweat gland. The middle bottom arrow is a hair follicle.

Question 8

You are looking at a sample of hair follicles. Why might you not see a hair shaft in the follicle?

Answer 8

The follicle is at a different stage of maturation. Mature follicles do not have a hair shaft.

Question 9

Why do people with burn injuries that destroy all of their hair follicles not regrow normal skin?

Answer 9

Stem cells for skin are located in the bulge of the hair follicle. If these are destroyed the skin cannot grow back normally.

Question 10

*

Answer 10

1. Smooth muscle 2. Collagen bundles

Question 11

*

Answer 11

1. Sebaceous gland (note large puffy cells) 2. Hair follicle

Question 12

How does sweat gland secretion differ from sebaceous gland secretion?

Answer 12

Sweat gland = merocrine Sebaceous gland = holocrine

Question 13

What glands secrete by apocrine secretion?

Answer 13

Mammary glands. Apocrine glands actually don’t secrete this way.

Question 14

*

Answer 14

1. Nerve, note lots of axons. 2. Pacinian corpuscle, note single center nerve

Question 15

Where do eccrine and apocrine sweat glands empty their contents?

Answer 15

Apocrine = follicle. Eccrine = pore at surface

Question 16

*What do these different cells of the salivary gland secrete?

Answer 16

The lighter staining areas are the mucous secreting cells. The darker staining cells are the serous secreting cells.

Question 17

What is different between interlobular ducts and intralobular ducts?

Answer 17