Intro to derm- Innervation & vascular supply

Question 1

What blood supply does the epidermis receive and how?

Answer 1

it receives blood supply from nearby deep and superficial plexus but this doesn’t not cross into the epidermis

Question 2

What provides blood supply to the papillary dermis, reticular dermis and hypodermic?

Answer 2

In the same order, the superficial papillary plexus, reticular plexus and subcutaneous plexus.

Question 3

What type of innervation is found in eccrine and apocrine glands? What is the difference between these glands?

Answer 3

Apocrine glands are only found in axilla, groin and nipples. They have free (non-encapsulated) innervation.

Question 4

What is the difference between corpuscular and free afferent nerves?

Answer 4

Corpuscular are encapsulated receptors and free aren’t.

Question 5

What is the function of Meissner’s corpuscle? Where is it most commonly found?

Answer 5

tactile corpuscles- for light touch and slow vibration. It is most abundant in thick hairless skin (ie finger-ads and lips)

Question 6

What is the function of Ruffini corpuscles? Where is it most abundant? How is it shaped?

Answer 6

Detects skin stretch, shaped like a spindle and found around fingernails (monitors slippage of objects)

Question 7

What is the function of Pacinian corpuscle? Where is it found? What is its shape?

Answer 7

to detect deep touch and detects surface texture. It is found in papillae of hands and feet and has an oval shape

Question 8

What is the function of a Merkel cell? How is it shaped? Where is it found?

Answer 8

Detect sustained light touch, are oval shaped and are most abundant in fingertips

Question 9

Which modalities involve A-beta fibres?

Answer 9

light touch, touch, pressure and vibration

Question 10

Which modalities involve A-gamma fibres?

Answer 10

pressure, touch and pain

Question 11

Which modalities involve C fibres’

Answer 11

temperature