Neural Tissue

Question 1

Cerebrospinal Fluid

Answer 1

• Produced by modified ependymal cells in ventricles (Choroid Plexus)
• Function:
  
  • Protection: cushion and immune function
  • Buoyancy: reduces weight and pressure on brain base
  • Excretion: removes toxic elements
  • Endocrine Transport: carries hormones out of brain

Question 2

Ganglion

Answer 2

Collection of peripheral neuronal cell bodies

Question 3

Characteristics of CNS

Answer 3

• Highly cellular
• Cells have polarity
• Limited Connective Tissue: except surrounding blood vessels
• Basal lamina
• Fluid Filled cavities (ventricles)

Question 4

Neural Crest Cells

Answer 4

• multipotent

- Produce neurons and glia of the PNS

Question 5

Astrocytes

Answer 5

• Largest macroglia cells
• many processes
• Function:
  
  • Structural and nutrient support
  • Maintains blood brain barrier
  • Removes metabolites, waste, NT
• Stores glycogen, and provides lactate to neurons

Question 6

Oligodendrocytes

Answer 6

• Produce CNS myelin

- Wraps multiple axons

Question 7

Microglia

Answer 7

• Immune cells of CNS
• Survey tissue and phagocytize debris
• Release inflammatory signals
• Originate in bone marrow unlike the rest that come from CNS

Question 8

Ependymal Cells

Answer 8

• Epithelial like
• Cuboidal or columnar w/ cilia or microvilli
• Line the central canal and ventricles
• NO basal lamina
• No tight junctions: allows CSF exchange w/ tissue
• Specialized ependymal cells associated w/ vessels make CSF: choroid plexus

Question 9

Schwann Cells

Answer 9

• Myelinate peripheral nerves
• Main supporting cell in PNS
• Maintains the correct microenvironment around nerves
• Only surrounds ONE axon

Question 10

Satellite cells

Answer 10

• Astrocyte-like
• Flattened cells around neurons in ganglia
• Maintain the environment for neurons in ganglia