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ANIMSCI 3140 > Exam 3 - Integumentary System > Flashcards

Exam 3 - Integumentary System Flashcards

1
Q

The integumentary system is an important _________ ________ which ________ water loss, invasion by ___________, and _________ trauma

A

Protective barrier; reduces; microorganisms; abrasive

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2
Q

Skin

A

Covers the outside of the animal; continuous with mucosal membranes at oral, anal, and urogenital orifices, the vestibule of the nostril, and the palpebral fissure

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3
Q

Outer epidermis

A

keratinized stratified squamous epithelium

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4
Q

Dermis

A

Dense fibrovascular connective tissue

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5
Q

Subcutaneous layer

A

Hypodermis

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6
Q

Adipose tissue

A

Insulator and shock absorber

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7
Q

Which layer of the skin is adipose tissue in

A

Subcutaneous layer

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8
Q

How is skin characterized

A

By the mucocutaneous junction

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9
Q

Skin is ________ where it is most exposed and ______ in protected regions

A

Thickest; thinner

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10
Q

The ___________ ________ consists of layers of dead, flattened cells

A

Stratum corneum

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11
Q

The __________ _____________ consists of spindle-shaped cells containing basophilic keratohyalin granules

A

stratum granulosum

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12
Q

The _______ _________ has a spiny appearance because of desmosomes (intercellular bridges) connecting adjacent cells

A

stratum spinosum

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13
Q

A layer of mitotically active cuboidal or columnar cells ________ _______ follows the contour of the underlying dermis, to which it is closely applied

A

Stratum basale

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14
Q

The ______ lies beneath the epidermis

A

Dermis

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15
Q

The _________ _______, which is variably present, comprises cells that are poorly stainable

A

Stratum lucidum

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16
Q

The skins outer layer is referred to as ______

A

Epidermis

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17
Q

Epidermis has these the of cells

A

Stratified squamous epithelium

18
Q

The skin’s middle layer is referred to as _____

A

Dermis

19
Q

PAGE 7

A
20
Q

The dermis features _______ _______ which _______ with the overlying epidermis

A

Dermal papillae; interdigitate

21
Q

PAGE 8

A
22
Q

Blister

A

Local disruption between epidermis and dermis at the dermal papillae

23
Q

Callus

A

Thickened stratum corneum

24
Q

The skin’s third layer is referred to as _______

A

Hypodermis

25
Q

The ________ and the _____ are both made up of thick connective tissue but different types

A

Hypodermis; Dermis

26
Q

Hypodermis

A

Separated dermis from underlying structures

27
Q

________ connective tissue that allows movement without tearing

A

Areolar

28
Q

Variable amounts of fat (________ ________) are present in the hypodermis, with species dependent distribution and relative abundance

A

panniculus adiposus

29
Q

Hair

A

Important for maintenance of body temperature (insulation) and protection from UV light

30
Q

The three main types of hair

A
  1. Primary / Guard Hairs – straight or arched
  2. Secondary / Wool Hairs / Undercoat – softer, shorter
  3. Tactile Hairs - whiskers around the face; can also be found
    throughout the coat
31
Q

Primary/Guard hairs

A
32
Q

Secondary/Undercoat/Wool hairs

A
33
Q

Tactile Hairs

A
34
Q

Hair structure

A

An individual hair arises from a modification of the
epidermis, called the hair follicle

35
Q

Arrector pili muscle

A

Tiny, smooth muscle bundle; contraction will straighten hair toward 90°

36
Q

Dermal papilla

A

Surrounds the hair bulb
The division of the epithelial cells covering the dermal papilla generates the hair itself

37
Q

External epithelial root sheath

A

The follicle invaginates from the surface of the skin as a double-layered root sheath that surrounds the hair and terminates in a hair bulb of epidermal origin

38
Q

Sebaceous glands

A

Classified as holocrine glands and secrete an oily secretory
product (called sebum) produced by disintegration of epithelial cells within the glands

39
Q

How do sebaceous glands work

A

Contraction of the arrector pili muscle compresses
the glands and aids in emptying them
Open directly onto the skin surface and include: in
the ear canal, around the anus, and in the penis,
prepuce, and vulva, along with the tarsal glands of
the eyelid

40
Q

Sudiferous glands aka sweat glands

A

can be found over the entire body of farm animals, including the horse, cow, sheep, and pig, although in pigs they are sparse

41
Q

PAGE 17

A

ANIMSCI 3140 (11 decks)

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