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Human Histology > (M) Lab: Skin > Flashcards

(M) Lab: Skin Flashcards

1
Q

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

A

Stratum Basale

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2
Q

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

A

Melanocytes

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3
Q

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

A

Stratum Spinosum

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4
Q

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

A

Tonofibrils

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5
Q

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

A

Desmosomes (cell to cell adhesion)

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6
Q

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

A

Stratum Granulosum

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7
Q

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

A

False (basophilic hence dark-staining)

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8
Q

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

A

False (basophilic hence dark-staining)

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9
Q

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

A

False (thick)

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

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10
Q

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

A

Stratum Lucidum

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11
Q

What layers consist of basophilic cells/cytoplasm?

A
  1. Stratum Basale - the columnar/cuboidal cells
  2. Stratum Granulosum - the keratohyaline granules (IN THE CYTOPLASM)
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12
Q

The basophilic cytoplasm contents in the Stratum Granulosum are called?

A

Keratohyaline granules

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13
Q

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

A

False (eosinophilic)

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14
Q

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

A

Eleidin

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15
Q

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

A

Stratum Corneum

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16
Q

T or F: The Stratum Corneum is shed PERIODICALLY

A

False (continuously)

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17
Q

What is it called when surface cells continuously flake off?

A

Exfoliate or Slough off

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18
Q

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

A

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

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19
Q

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

A

Connective

20
Q

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

A

Connective

21
Q

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

A

Connective Tissue Proper

22
Q

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

A

Connective Tissue Proper

23
Q

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

A

False (reticular)

24
Q

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

A

Loose Connective Tissue

25
Q

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

A

Dense Irregular Connective Tissue

26
Q

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

A

Meissner’s Corpuscles

27
Q

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

A

False (papillary)

28
Q

The pilosebaceous unit is composed of what 2 parts?

A
  1. Hair follicle
  2. Sebaceous glands
29
Q

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

A

Serous

30
Q

What is the mechanism of release of sweat glands?

A

Merocrine

31
Q

What is the morphology of sweat glands?

A

Simple Coiled Tubular

32
Q

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

A

Mucous

33
Q

What is the mechanism of release of sebaceous glands?

A

Holocrine

34
Q

What is the morphology of sebaceous glands?

A

Simple Branched Acinar

35
Q

What layers are found in thin skin?

A

Basale, Spinosum, Granulosum, and Corneum

36
Q

Thin skin is found on the entire body except?

A

Palms and soles

37
Q

Hair follicles are present in thin skin EXCEPT?

A
  1. Lips
  2. Labia minora (vagina)
  3. Glans penis
38
Q

Where is the location of thin skin?

A

Everywhere except the palms and soles

39
Q

Where is the location of thick skin?

A

Palms and soles

40
Q

What epidermal layer is ABSENT in thin skin?

A

Stratum Lucidum

41
Q

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

A

False (THIN)

42
Q

T or F: Thick skin has sebaceous glands

A

False (only thin skin since it has hair)

43
Q

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

A

False (found on both)

44
Q

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

A

True

45
Q

How many epidermal layers does thin skin have?

A

Only 4

Human Histology (26 decks)

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