Blood Vessels And Nerves Flashcards
What are the layers of the general structure of blood vessels
Endothelium Basement membrane Intima Internal elastic lamina Media External elastic lamina Adventitia
What is the intima
Loose connective tissue
What is the media
Smooth muscle, some fibroblasts, collagen and elastin
What is the adventitia
Loose connective tissue
What are the elastic arteries
Aorta and pulmonary arteries
What do elastic arteries have
Concentric sheets of elastin
What are the types of arteries
Muscular and elastic
What is an arteriole
Has 3 or fewer muscular layers
Less than 100 um in diameter
Poorly defined elastic lamina
What is the capillary structure
Endothelium and basement membrane
What regulates the size of capillaries
Pericytes
Where are fennestrated capillaries found
Kidneys and liver
What is the difference between the structure of veins and arteries
Veins have no external elastic lamina, a thinner media and wider lumen
Where is myelin produced
Schwann cells
What are the connective tissues of the peripheral nerves
Endoneurium
Perineurium
Epineurium
What is the function of endoneurium
Binds together individual axons
What is the function of perineurium
Binds together bundles of axons to form fascicles
What is the function of epineurium
Binds fascicles together to form nerve fibres
What is a neurovascular bundle
A nerve, arteriole and venule
How is myelin produced in the PNS
A spiral of opposed Schwann cell membranes
An individual Schwann cell wraps around an individual axon multiple times to produce myelin
What are the gaps between Schwann cells
Nodes of Ranvier
What is the difference between myelinated axons and non myelinated axons
Multiple Non myelinated axons are supported by one Schwann cell
Myelinated axons are supported by only one Schwann cell at a time
Where are the cell bodies of lower motor neurones
Grey matter if spinal cord
Where are sensory nerve cell bodies
Dorsal root ganglion
