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Integumentary System > Dermis & Hypodermis > Flashcards

Dermis & Hypodermis Flashcards

1
Q

Dermis is located between

A

epidermis and hypodermis

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2
Q

Two components of dermis

A

Superficial papillary layer

Deep reticular layer

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3
Q

Dermis

A

It is the thick sensitive layer of skin or connective tissue beneath the epidermis.

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4
Q

Structural components of dermis

A

Collagen and Elastin

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5
Q

Protein responsible for skin strength

A

Collagen

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6
Q

Protein responsible for skin elasticity

A

Elastin

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7
Q

Collagen and Elastin are obtained from

A

Fibroblast cells

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8
Q

Tissue found in papillary layer

A

Areolar tissue

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9
Q

Dermal papillae projects between

A

epidermal ridges

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10
Q

Tissue found in reticular layer

A

Dense irregular connective tissue

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11
Q

Inflammation of the papillary layer are caused by

A

Infection
Radiation
Mechanical irritation
Chemicals

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12
Q

Inflammation of the papillary layer are characterized by

A

Pain and itch

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13
Q

Characteristics of skin

A

Strong( due to collagen fibers)
Elastic( due to elastic fibers)
Flexible

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14
Q

Tissues in hypodermis

A

Elastic areolar and adipose tissues

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15
Q

Hair Follicles

A

Organs that form the hairs.

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16
Q

Location of hair follicles

A

Deep in the dermis.

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17
Q

Hair follicles are wrapped in

A

Dense connective tissue sheath.

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18
Q

Base of hair follicle surrounded by

A

Root hair plexus (sensory nerves)

19
Q

Accessory structures of hair

A

Arrector pili and sebaceous glands.

20
Q

Arrector pili

A

Involuntary smooth muscle

21
Q

Function of arrector pili

A
  • Causes hairs to stand up.

- Produces goosebumps.

22
Q

Function of sebaceous glands

A

secrete sebum

23
Q

Regions of the Hair Structure

A

Hair root and Hair shaft

24
Q

Hair root

A

Lower part of the hair which is attached to the integument.

25
Q

Hair shaft

A

Upper part of the hair which is not attached to the integument.

26
Q

Hair shaft structures

A

Medulla
Cortex
Cuticle

27
Q

Medulla of hair shaft

A
  • It is the Core

- The dead cells contain soft keratin and air to provide flexibility.

28
Q

Cortex of hair shaft

A
  • It is the Middle layer

- The dead cells contain hard keratin to provide stiffness.

29
Q

Cuticle of hair shaft

A
  • It is the Outermost layer

- The overlapping dead keratinized cells form shiny surface.

30
Q

Function of the Hair

A
  • Head : -UV protection
    - Cushion from trauma
    - Insulation.
  • Nostrils, Ear canals, Eyelashes : -Prevent entry of foreign material.
  • Body Hair : -Sensory detection.
31
Q

Structure of Nails

A

Made of dead cells packed with keratin.

32
Q

Function of Nails

A

Protect fingers and toes.

33
Q

Where is Nail produced?

A

Occurs in a deep epidermal fold near the bone called the nail root.

34
Q

Describe the nail body.

A

The visible portion of the nail which covers the nail bed.

35
Q

Describe the lunula.

A

It is a pale crescent at the base of the nail.

36
Q

Describe the side of nails.

A

They lie in lateral nail grooves which are surrounded by lateral nail folds.

37
Q

About how many sweat glands does an adult has?

A

Between 1.6 to 4 million.

38
Q

Types of sweat glands

A

Eccrine sweat glands and Apocrine sweat glands

39
Q

Location of Eccrine sweat glands

A

They are found almost all over the surface of the body, and are most numerous on the palms and soles.

40
Q

Location of Apocrine sweat glands

A

They are located mainly in the armpit, genital area and around the nipples of the breasts.

41
Q

Location of sebaceous glands

A

They are found all over the body except on the palms, the soles, and the top of the feet.

42
Q

Where are sebaceous glands most numerous?

A

On the face and scalp.

43
Q

Sebaceous glands secrete

A

Sebum

44
Q

Function of Sebum

A

It lubricates the skin and hair and inhibits the growth of certain harmful bacteria.

Integumentary System (4 decks)

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