Exam 4: Integumentary System Review Questions Flashcards Preview

Functional Histology VBMS 408 > Exam 4: Integumentary System Review Questions > Flashcards

Flashcards in Exam 4: Integumentary System Review Questions Deck (22):
1

Functions of the skin

Acts as a barrier, Temperature regulation, provides sensory information, endocrine and exocrine functions, Absorption

2

Thick Skin

palms of hands, feet, digital pads

3

Thin skin

face, abdomen, scrotum

4

To be able to explain the interaction of epidermal pegs and dermal papillae, and the implications for dermatoglyphics

Dermal papillae are in areas of high contact interdigitate with epidermal pegs. Result in linear elevations (epidermal ridges). Epidermal ridges form uniques patterns which can be used as a means of identification (dermatoglyphics or finger prints)

5

Epidermal ridges

(dermatoglyphics) formed from interdigitation between dermal papillae and epidermal pegs. used in identification.

6

Melanocytes

1) Dendritic cells scattered among the stratum basal 2) protects against ionizing radiation through the production of melanin

7

Langerhans cells

1)Antigen presenting cells migrate into skin from vascular system 2) intraepidermal macrophages 3) Display antigens to T - lymphocytes

8

Hypodermis

1) Meshwork of loose connective tissue and elastic fibers lying deep to the dermis. 2) Serves as an attachment site for cutaneous muscles 3) Provides for mobility of overlying skin

9

Keratinocytes

1) Main cell of epidermis 2) Formed in stratum basal 3) Produce and assemble keratin filaments as cells move through epidermis to stratum granulosum

10

How long is the keratinization process?

2-6 hours

11

Sebacceous gland morphology

simple, branched alveolar glands. Develop as outgrowths of ERS of hair follicle

12

Function of sebacceous glands

Produce Sebum; discharge sebum via holocrine method (fatty material and part of cell secreted)

13

Sebum

produced by sebacceous glands ( oily substance consisting of FA, cholesterol, and vitamin D precursors. Reduces entry of microbes through the skin. Decreases water loss, and keeps hair and skin surface pliable (flexible))

14

Sweat gland morphology

simple, coiled, tubular glands. Utilize apocrine and merocrine secretion.

15

Apocrine Secretion

Apical end of secreting cell excreted along with secretory product (domestic animals)

16

Merocrine

Secretory product excreted in vesicles that fuse with plamalemma to release product (Humans)

17

Sweat components

Water, protein, NaCl, urea, and more; 600ml water lost daily due to sweating and evaporation from skin and lungs

18

Follicle formation

1) in-growths of epidermis and basement membrane into dermis to form follicles 2) occurs at 3rd month of fetal life 3) grows at 4) 1mm/day rate loss - 70-100/day

19

Superficial to deep hair follicle

1) ERS (attachment site for erector pili muscle) 2) IRS (Henley's Layer (single layer cuboidal non nucleated cells), Huxley's Layer (1-3 flattened, nucleated cells), IRS cuticle (Squamous cells adjacent to hair cuticle) ) 3) Hair cuticle (outer most layer of hair, cornified non-nucleated, protects hair from physical damage 4) Cortex (Thickest layer, determines texture, color, and elasticity of hair) 5) Medulla (only found in thick hairs, disappears toward hair tip)

20

Sinus hair found in what type of organisms

domestic animals around lips and eyelids

21

Sinus hair structure

1) Thicker inner and outer layers of dermal sheath 2) Blood filled sinus between inner and outer layers of dermal sheath 3) Connective tissue trabeculae in blood sinus. 4) Free nerve endings and merkel cells associated w/epidermal cells and connective tissue of dermal sheath

22

Function of sinus hair

1) movement of sinus hair at skin surface 2) displacement of hair shaft within blood sinus 3) stretching of connective tissue trabeculae 4) Stimulation of nerve endings and merkel cells