The Dermis

Question 1

Describe the dermis

Answer 1

-highly vascular layer deep to epidermis
-has 2 layers; 2 types of connective tissue

Question 2

What are the functions of the dermis

Answer 2

-provides blood supply to epidermis
-has sensory receptors
-anchors epidermis in place

Question 3

What is the papillary layer

Answer 3

-thinner, most superficial out of the 2 layers in the dermis

-has loose connective tissue

-has special collagen fibers at dermis-epidermal junction; extends into epidermal basement membrane; anchors epidermis to dermis

Question 4

Describe dermal papillae

Answer 4

-tiny projections at surface of papillary layer where it contacts epidermis

-has small blood vessels (capillaries) arranged in loops; extend up into most superficial part of dermis papillae

Question 5

Describe the reticular layer

Answer 5

deep thicker layer; separates dermis from hypodermis; mostly dense irregular tissue; largely irregularly arranged collagen bundles

Question 6

What does the reticular layer contain

Answer 6

-rich in proteoglycans that draw water into ground substance; keeps skin firm and hydrated

-has blood vessels, sweat glands, hairs, Sebaceous glands, and adipose tissue

Question 7

What is the sensory receptor in the dermal papillae

Answer 7

tactile (meissner) corpuscles: in dermal papillae; sensory receptors;

Question 8

What is the sensory receptor in reticular layer

Answer 8

lamellated (pacinian) corpuscles: sensory receptors within reticular layer;

Question 9

What do collagen bundles do in the reticular layer

Answer 9

collagen bundles strengthen dermis; prevents traumatic injuries from damaging deeper tissues

Question 10

What do elastic fibers do in reticular layer

Answer 10

-elastic fibers allow dermis to return to its original shape and size after stretching

Question 11

What does the papillary layer do

Answer 11

allows oxygen and nutrients to diffuse into ECF of dermis, then into avascular epidermis

Question 12

Sensory receptor of dermal papillae:

What does tactile corpuscle do

Answer 12

responds to light touch stimuli; more numerous where sensation is primary function (skin of fingertips, lips, face, and external genitalia)

Question 13

Sensory receptor of reticular layer:

What does lamellated (pacinian) corpuscles do

Answer 13

responds to changes in pressure and vibration