Anatomy lecture 6 Flashcards
1
Q
What is the histology of epidermis? Is it vascularized or no?
A
stratified squamous epithelium. It is NOT vascularized
2
Q
What is the histology of dermis? Is it vascularized or no?
A
Irregular dense fibrous connective tissue. It is vascularized
3
Q
➢ List and discuss the major functions of the vertebrate integument
A
o Major functions:
• Protection:
• Against mechincal injury
• Against invasion by foeign oragnisms nd substances
- Coloration: (visual appearance with regards to color)
- May provide protection through camouflage
- May provide warning signals
- May be involved in sexual recognition
- Sensory reception
- Integument may be densely packed with receptors for touch, pressure, temperature, pain, and or electromagnetic radiation
- Excretion
- May be used to excrete salt (fishes)or nitrogenous wastes products
- Gas exchange
- Many vertebrates can carry out respiratory gas exchange partly or entirely through the integument
- In amphioxus, gas exchange occurs almost exclusively through the integument – the gills are used for filter feeding
- Water regulation
- Integument is very important in preventing excess water loss
- Temperature regulation
- Important in terrestrial vertebrates and marine mammals
- Feathers in birds and hairs in mammals assist in temperature regulation
- Among many animals, including humans, dilation and contraction of cutaneous blood vessels and associated sweating are important thermoregulatory mechanisms
- Food storage
- Among mammals and birds, the connective tissue below the dermis (hypodermis) is a common site for the deposition of adipose (fat) tissue, which can be used both for insulation and for energy storage
- Nourishment
- Mammary glands in mammals (integumentary derivatives) are an essential source of nutrition for infants
- Locomotion
- Webbing in the feet of aquatic birds and frogs
- Wing feathers in birds
- Flight membranes in bats
- Specialized ventral epidermal scales (scutes) in snakes
4
Q
➢ Describe types of glands in the epidermis of fishes
A
o Agnathans:
• Unicellular mucous gland
• Book: in aganthans, the integumentary glands are unicellular mucous glands.
o In Chondrichthyes and osteichthyes, we find both unicellular and multicellular mucous glands
