UNIT 3 - DERMIS

Question 1

what are the two regions of the dermis called in order?

Answer 1

1. papillary region

2. reticular region

Question 2

function of the dermis?

Answer 2

1. structural,
2. immunological,
   3 Mechanical protection, 4.homeostasis control
3. (thermoregulation, water retention)

Question 3

what are the receptors for:

1. fine touch
2. pain
3. pressure

Answer 3

1. fine touch = Meissner corpuslces
2. nocireceptors
3. Pacinian + rufini endings = pressure

Question 4

what cells are in the dermis? (7)

Answer 4

1. fibroblasts
2. macrophages
3. adipose
4. hair follicles
5. sebaceous glands
6. blood vessels
7. nerve endings

Question 5

PAPILLARY REGION made of=

Answer 5

• fine elastic fibres + collagen + ground substance

Question 6

-Meissner corpuscle + NERVE ENDINGS IS WHERE?

Answer 6

PAP REGION

Question 7

DERMAL PAPILLAE does what?

Answer 7

epidermal ridges increase contact surface between dermis + epidermis

has capillaries = nutrition to epidermis `

Question 8

PACINIAN CORPUSCLE IS WHERE?

Answer 8

RETICULAR REGION

Question 9

papillary region is made of what type of tissue?

Answer 9

AREOLAR CONNECTIVE TISSUE

Question 10

RETICULAR region is made of what type of tissue?

Answer 10

DENSE IRREGULAR CONNECTIVE TISSUE

Question 11

PAPILLARY RIDGES=?

Answer 11

pattern of finger print or soles

Question 12

reticular region is made of what?

Answer 12

THICK collagen + elastic

-resistance + elasticity (stretch marks )

Question 13

where are the accessory structures (HAIR NAILS ETC of the skin formed?

Answer 13

EMBRYONIC EPIDERMIS

Question 14

what are the 3 concentric layers of hair?

Answer 14

1 medulla (pigment)

2. cortex
3. cuticle (keratin)

Question 15

hair follicle (surrounds hair root ) characteristics=

Answer 15

1. internal root sheath =synthesised by matrix

2. external root sheath = epidermis

Question 16

where is hair regeneration done?

Answer 16

hair bulb (enlarge at base)

Question 17

HAIR MATRIX MADE OF?

Answer 17

GERMINAL LAYER OF CELLS FROM STRATUM BASALE

Question 18

what does hair root plexus do?

Answer 18

sensory nerve touch

Question 19

what does arrector pili muscle do?

Answer 19

smooth muscle contracts with cold or fear

Question 20

sebaceous glands made of?

Answer 20

Simple branched acinar glands

-holocrine = sebum onto epidermal surface

Question 21

sebaceous glands function=

Answer 21

1. anti dehydration

2. inhibits bacterial growth

Question 22

sweat glands made of ?

Answer 22

• MEROCINE GLANDS

- works after birth

Question 23

where are 1. sebaceous glands NOT

2. sweat glands NOT

Answer 23

1. PALAMR + PLANTAR

2. LIPS + AUDITORY

Question 24

function of sweat gland=

Answer 24

1. thermoreg
2. ex uria, uric acid, ammonia
3. emotional sweating COLD

Question 25

WHAT IS A APOCRINE GLAND?

Answer 25

MAMMARY GLAND = Compound tubulo-acinar.

Question 26

WHAT are Ceruminous glands?

Answer 26

Modified sweat glands= waxy secretion in ear

Question 27

what happens when youre hot?

Answer 27

perspiration + vasodilation

Question 28

what happens when youre extreme hot?

Answer 28

blood conducted to muscle

Question 29

synthesis of vitamin D?

Answer 29

1. UV light activates precursor of VIT D in skin
2. hepatic/ renal enzymes modify this = CALCITROL (most active form)
3. balances Ca