Chapter 10.2

Question 1

What are the layers of the skin

Answer 1

• hypodermis(subcutaneous layer)
• dermis
• epidermis

Question 2

What are the layers of the epidermis

Answer 2

• divided into layers called strate
• includes:

1) stratum basule
- >stem cells(for keratinoocytes) and is responsible for forming keratin

2) stratum spinosum
- >the layer is referred to as the site of Langerhans cells

3) stratum granulosum
- >where the karetinocytes die and lose their nuclei

4) stratum lucidum
- >hairless skin

5)stratum corneum

Question 3

How do calluses form

Answer 3

• from excessive amounts of keratin deposition

- >they provide protection to avoid future damage

Question 4

What are Merkle cells, Meissner corpuscles, Ruffini endings and Pacinian corpuscles responsible for? Note that all these cells are in the dermis layer(most sensory receptors are located in the dermis)

Answer 4

Merkle

• > these cells are connected to sensory neurons
• > responsible for deep pressure and texture sensations

Meissner
->light touch

Ruffin endings
->respond to stretch

Pacinian corpuscles
->deep pressure and vibration

Question 5

What is the function of the of the hypodermis

Answer 5

• it is a layer of connective tissue

- >that connects the skin to the rest of the body