(M) Lab: Skin

Question 1

Layer of the Epidermis:
- consists of a single layer of basophilic columnar/cuboidal cells
- has INTENSE mitotic activity

Answer 1

Stratum Basale

Question 2

These cells are clear and are found in the basal layer with dark nuclei

Answer 2

Melanocytes

Question 3

Layer of the Epidermis:
- is the THICKEST layer
- consists of polyhedral cells that synthesize keratin filaments (tonofibrils) that converge and terminate at the desmosomes

Answer 3

Stratum Spinosum

Question 4

These are keratin filaments that converge and terminate at the desmosomes in the Stratum Spinosum

Answer 4

Tonofibrils

Question 5

These are known as the INTERCELLULAR bridges found in the Stratum Spinosum

Answer 5

Desmosomes (cell to cell adhesion)

Question 6

Layer of the Epidermis:
- consists of 3-5 layers of flat polygonal cells
- their cytoplasms are filled with keratohyaline granules which are basophilic

Answer 6

Stratum Granulosum

Question 7

T or F: The columnar/cuboidal cells of the Stratum Basale are eosinophilic

Answer 7

False (basophilic hence dark-staining)

Question 8

T or F: The keratohyaline granules of the Stratum Granulosum are eosinophilic

Answer 8

False (basophilic hence dark-staining)

Question 9

T or F: The Stratum Lucidum is only found in thin skin

Answer 9

False (thick)

*Think: The thicker the skin, the more layers it has

Question 10

Layer of the Epidermis:
- found only in thick skin
- consists of a translucent layer of flat eosinophilic cells

Answer 10

Stratum Lucidum

Question 11

What layers consist of basophilic cells/cytoplasm?

Answer 11

1. Stratum Basale - the columnar/cuboidal cells
2. Stratum Granulosum - the keratohyaline granules (IN THE CYTOPLASM)

Question 12

The basophilic cytoplasm contents in the Stratum Granulosum are called?

Answer 12

Keratohyaline granules

Question 13

T or F: The Stratum Lucidum is composed of basophilic cells

Answer 13

False (eosinophilic)

Question 14

Keratinocytes in the Stratum Lucidum are densely packed with keratin precursors known as?

Answer 14

Eleidin

Question 15

Layers of the Epidermis:
- consists of 15-20 flat non-nucleated cells that are CONTINUOUSLY shed

Answer 15

Stratum Corneum

Question 16

T or F: The Stratum Corneum is shed PERIODICALLY

Answer 16

False (continuously)

Question 17

What is it called when surface cells continuously flake off?

Answer 17

Exfoliate or Slough off

Question 18

T or F: The Stratum Corneum is prominent in thin skin

Answer 18

False (thick; palms, soles, and corresponding fingers and toes)

Question 19

What is the fundamental tissue type of the papillary layer of the dermis?

Answer 19

Connective

Question 20

What is the fundamental tissue type of the reticular layer of the dermis?

Answer 20

Connective

Question 21

What is the subtype of the papillary layer of the dermis?

Answer 21

Connective Tissue Proper

Question 22

What is the subtype of the reticular layer of the dermis?

Answer 22

Connective Tissue Proper

Question 23

T or F: The papillary layer of the dermis is also known as the dermis proper

Answer 23

False (reticular)

Question 24

What is the specific subtype of the papillary layer of the dermis?

Answer 24

Loose Connective Tissue

Question 25

What is the specific subtype of the reticular layer of the dermis?

Answer 25

Dense Irregular Connective Tissue

Question 26

This is found in the papillary layer of the dermis and its function is detection of fine touch

Answer 26

Meissner's Corpuscles

Question 27

T or F: The Meissner's Corpuscles are found in the reticular layer of the dermis

Answer 27

False (papillary)

Question 28

The pilosebaceous unit is composed of what 2 parts?

Answer 28

1. Hair follicle 2. Sebaceous glands

Question 29

What is the nature/type of secretion of sweat glands?

Answer 29

Serous

Question 30

What is the mechanism of release of sweat glands?

Answer 30

Merocrine

Question 31

What is the morphology of sweat glands?

Answer 31

Simple Coiled Tubular

Question 32

What is the nature/type of secretion of sebaceous glands?

Answer 32

Mucous

Question 33

What is the mechanism of release of sebaceous glands?

Answer 33

Holocrine

Question 34

What is the morphology of sebaceous glands?

Answer 34

Simple Branched Acinar

Question 35

What layers are found in thin skin?

Answer 35

Basale, Spinosum, Granulosum, and Corneum

Question 36

Thin skin is found on the entire body except?

Answer 36

Palms and soles

Question 37

Hair follicles are present in thin skin EXCEPT?

Answer 37

1. Lips 2. Labia minora (vagina) 3. Glans penis

Question 38

Where is the location of thin skin?

Answer 38

Everywhere except the palms and soles

Question 39

Where is the location of thick skin?

Answer 39

Palms and soles

Question 40

What epidermal layer is ABSENT in thin skin?

Answer 40

Stratum Lucidum

Question 41

T or F: The dermal appendages for thick skin include sweat glands, sebaceous glands, hair follicles, and the arrector muscles

Answer 41

False (THIN)

Question 42

T or F: Thick skin has sebaceous glands

Answer 42

False (only thin skin since it has hair)

Question 43

T or F: Sweat glands are only found in thick skin

Answer 43

False (found on both)

Question 44

T or F: Sweat glands are found on both skin types while sebaceous glands are only found in thin skin

Answer 44

True

Question 45

How many epidermal layers does thin skin have?

Answer 45

Only 4