Skin (layers, vascularization and nervous receptors)

1.      Match the following

____(a) deep region of the dermis composed primarily of dense irregular connective tissue

____(b) composed of keratinized stratified squamous epithelial tissue

____(c) not considered part of the skin, it contains areolar and adipose tissues and blood vessels; attaches skin to underlying tissues and organs

____(d) superficial region of the dermis; composed of areolar connective tissue

(1) subcutaneous layer (hypodermis)

(2) papillary region

(3) reticular region

(4) epidermis

2.      Match the following

____(a) produce the protein that helps protect the skin and underlying tissues from light, heat, microbes, and many chemicals

____ (b) produce a pigment that contributes to skin color and absorbs ultraviolet light

____ (c) cells that arise from red bone marrow, migrate to the epidermis, and participate in immune responses

____ (d) cells thought to function in the sensation of touch

____ (e) located in the dermis, they function in the sensations of warmth, coolness, pain, itching, and tickling

____ (f) smooth muscles associated with the hair follicles; when contracted, they pull the hair shafts perpendicular to the skin’s surface

____ (g) an abnormal thickening of the epidermis

____ (h) release a lipid-rich secretion that functions as a water-repellent sealant in the stratum granulosum

____ (i) pressure-sensitive cells found mostly in the subcutaneous layer

____ (j) a fatty substance that covers and protects the skin of the fetus from the constant exposure to amniotic fluid

____ (k) associated with hair follicles, these secrete an oily substance that helps prevent hair from becoming brittle, prevents evaporation of water from the

skin’s surface, and inhibits the growth of certain bacteria

(1) Merkel cells

(2) Callus

(3) Keratinocytes

(4) Langerhans cells

(5) Melanocytes

(6) Free nerve endings

(7) Sebaceous glands

(8) Lamellar granules

(9) Pacinian (lamellated) corpuscles

(10) Vernix caseosa

(11) Arrector pili

3.      What of the following layers of the skin is avascular

a)      Epidermis

b)     Dermis

c)      Ultradermis

d)     Adermis

4.      Avascular means

a)      Very rich in blood vessels

b)     Has few blood vessels

c)      Has no blood vessels

d)     Is very vascularized

Answers