Semester 1 Anatomy

Question 1

Describe the overall structure of skin

Answer 1

3 layers

1. epidermis
2. dermis
3. hypodermis / subcutaneous level

Question 2

Describe the 5 layers of the epidermis

Answer 2

CLGSB

Come - Cornified layer or Horny layer of Stratum Corneum (most superficial layer of epidermis)

Lets - Stratum Lucidum

Get - Stratum Granulosum

Sun - Stratum Spinosum

Burnt - Stratum Basale or Stratum Germinativum (deepest layer of epidermis)

Question 3

Sebaceous gland

Answer 3

• excretory gland associated with hair folliciles
• Excrete ‘sebum’ - a mixture of lipids
• undergo secretion when the cell lyses

Question 4

Melanocytes

Answer 4

• basal layer of epidermis
• synthesise melanin - used to protect DNA from UV light damage
• transmit the melanin to surrounding keranocytes

Question 5

Antigen presenting Cells

Answer 5

• Invade the epithelium (stratum spinosum) to collect the antigens
• Then migrate to lymph nodes
• Fewer desmosome connections - so when skin tissue shrinks, a space opens up = makes it easy to find them

Question 6

Meissner’s corpsules

Answer 6

• nerve endings which are sensitive to light touch
• close as possible to he skins surface
• surrounded by a fibrous corpuscle
• fine touch sensation
• they are ovally shaped

Question 7

Pacinian corpsule

Answer 7

• these are deeper down
• work on deep pressure and vibration
• are still encapsulated

Question 8

Sweat glands

Answer 8

• simple coiled glands
• ducts are made of cuboidal epithelial cells
• myoepithelial cells surround the secretory cells