Nervous Tissue Flashcards
What are the four types of glial cells found in the CNS?
- Astrocytes. 2. Microglial. 3. Ependymal. 4. Oligodendrites.
What are the two types of glial cells found in the PNS?
- Satellite. 2. Schwann.
What are the functions of astrocytes? (4)
- Maintain blood brain barrier. 2. Provide structural support. 3. Regulate ion, nutrient, and dissolved gas concentration. 4. Form scar tissue after injury.
What is the function of microglial cells?
Remove cell debris, waste, and pathogens by phagocytosis.
What are the functions of ependymal cells? (2)
- Line ventricles in the brain and central canal in the spinal cord. 2. Assist in producing, circulating, and monitoring cerebralspinal fluid.
What are the functions of oligodendrites? (2)
- Mylenates CNS axons. 2. Provides structural framework.
What are the functions of schwann cells? (3)
- Surrounds all axons in PNS. 2. Mylenates PNS axons. 3. Participates in repair process after injury.
What is a collection of cell bodies called in the CNS?
Nucleus.
What is a collection of cell bodies called in the PNS?
Ganglia.
What is the most common neuron type?
Multipolar neurons.
What type of neurons are most sensory neurons for touch, pain, and temperature?
Pseudounipolar neurons.
How many neurons can a schwann cell mylenate? Hoe many can an oligodendrocyte mylenate?
Schwann cells mylenate one. Oligodendrocytes mylenate multiple.
What is the endoneurium?
Connective tissue around each axon.
What is the perineurium?
Connective tissue around individual fascicles (small groups of axons).
What is the epineurium?
Connective tissue around the entire nerve.
