Skin Flashcards

1
Q

What occurs in the basal layer of the epidermis?

A

Basal keratinocytes undergo mitosis. Their daughter cells begin to move upwards in the epidermis producing keratins.

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2
Q

In which layer of the epidermis do the keratinocytes lose their plasma membrane?

A

The granular layer

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3
Q

What does the stratum corneum consist of?

A

It is made of layers of flattened corneocytes. These provide defence.

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4
Q

Name the two other cell types found in the epidermis and give details about where they are found and their function. (Other than corneocytes and keratinocytes)

A
  • Melanocytes: Occur at intervals along the basal layer of the epidermis. They produce melanin.
  • Langerhan cells: They are scattered through the prickle cell layer. They present antigens to T lymphocytes and mediate immune reactions.
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5
Q

A good prognosis in a malignant melanoma is associated with….

A

Retention of the malignant melanocytes above the epidermal basement membrane.

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6
Q

Which stained is best used to view the dermo-epidermal juction?

A

PAS stain

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7
Q

Which common skin condition is associated with extreme proliferation of the epidermal basal layer?

A

Psoriasis. The extreme proliferation of the epidermal basal layer, causes gross thickening of the prickle cell layer and production of excessive corneum.

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8
Q

What is a malignant melanoma and how do they usually present?

A

It is an aggressive malignant tumour of the melanocytes. They usually present very similar to common moles.

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9
Q

What is vitiligo?

A

It is an autoimmune disease in which the immune system attacks the melanocytes. This causes well-demarcated depigmentation

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10
Q

The dermis is ……. …… connective tissue

A

Dense irregular

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11
Q

What types of fibres does the dermis contain?

A

Type 1 collagen and elastin

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12
Q

What is solar elastosis?

A

It is damage to collagen and elastin in the dermis, caused be excessive UV exposure.

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13
Q

The smaller blood vessels are found in which part of the dermis?

A

The superficial dermis

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14
Q

Where are mast cells found in the dermis?

A

Near blood vessels

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15
Q

The pilosebaceous unit is a type of …….. …… gland

A

Branched acinar gland

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16
Q

How does acne arise?

A
  • Abnormal differentiation of sebaceous gland ducts which become obstructed
  • It causes increased sebum production resulting in infection with normally harmless skin bacteria
17
Q

Which type of sweat gland is distributed over most of the body?

A

Merocrine sweat gland

18
Q

What are the four different regions of the epidermis from top to bottom?

A
  • Stratum corneum
  • Granular layer
  • Prickle cell layer
  • Basal layer
19
Q

What occurs in the basal layer of the epidermis?

A

Basal keratinocytes undergo mitosis. Their daughter cells begin to move upwards in the epidermis producing keratins.

20
Q

In which layer of the epidermis do the keratinocytes lose their plasma membrane?

A

The granular layer

21
Q

What does the stratum corneum consist of?

A

It is made of layers of flattened corneocytes. These provide defence.

22
Q

Name the two other cell types found in the epidermis and give details about where they are found and their function. (Other than corneocytes and keratinocytes)

A
  • Melanocytes: Occur at intervals along the basal layer of the epidermis. They produce melanin.
  • Langerhan cells: They are scattered through the prickle cell layer. They present antigens to T lymphocytes and mediate immune reactions.
23
Q

A good prognosis in a malignant melanoma is associated with….

A

Retention of the malignant melanocytes above the epidermal basement membrane.

24
Q

Which stained is best used to view the dermo-epidermal juction?

25
Which common skin condition is associated with extreme proliferation of the epidermal basal layer?
Psoriasis. The extreme proliferation of the epidermal basal layer, causes gross thickening of the prickle cell layer and production of excessive corneum.
26
What is a malignant melanoma and how do they usually present?
It is an aggressive malignant tumour of the melanocytes. They usually present very similar to common moles.
27
What is vitiligo?
It is an autoimmune disease in which the immune system attacks the melanocytes. This causes well-demarcated depigmentation
28
The dermis is ....... ...... connective tissue
Dense irregular
29
What types of fibres does the dermis contain?
Type 1 collagen and elastin
30
What is solar elastosis?
It is damage to collagen and elastin in the dermis, caused be excessive UV exposure.
31
The smaller blood vessels are found in which part of the dermis?
The superficial dermis
32
Where are mast cells found in the dermis?
Near blood vessels
33
The pilosebaceous unit is a type of ........ ...... gland
Branched acinar gland
34
How does acne arise?
- Abnormal differentiation of sebaceous gland ducts which become obstructed - It causes increased sebum production resulting in infection with normally harmless skin bacteria
35
Which type of sweat gland is distributed over most of the body?
Merocrine sweat gland
36
What are the four different regions of the epidermis from top to bottom?
- Stratum corneum - Granular layer - Prickle cell layer - Basal layer