Nervous Tissue Flashcards
What are the 3 main functions of the nervous system?
Sensory, Integrative, and Motor
What are the 2 major divisions?
Central and Peripheral Nervous System
What does the CNS include?
Brain and Spinal Cord
What does the PNS include?
Cranial Nerves, Spinal Nerves, Ganglia, Sensory Receptors
What division is the source of thoughts, emotions, and memories?
Central Nervous System
How many cranial nerves are in the PNS?
12 pairs
How many spinal nerves are in the PNS?
31 pairs
What can the PNS be further divided into?
Somatic, Autonomic, and Enteric NS
What are two types of nerve cells?
Neurons and Neuroglia
What neuroglia of CNS are the most common and form myelin sheath around more than one axon?
Oligodendrocytes
What neuroglia of CNS attach to blood vessels forming a blood-brain barrier that prevents harmful things to enter?
Astrocytes
Largest and most numerous neuroglia of CNS?
Astrocytes
What neuroglia of CNS play a part in memory and learning?
Astrocytes
Neuroglia of CNS that engage in phagocytosis of cellular debris and damaged nervous tissue?
Microglia
Neuroglia of CNS that produce cerebrospinal fluid
Ependymal
Neuroglia of PNS that produce myelin sheath around single axons
Shwann Cells
Neuroglia of PNS that support neurons in the ganglia
Satellite Cells
What are the 3 distinct portions of neurons?
Cell body, Dendrites, and Axon
Also called soma; contains a single nucleus and granular cytoplasm
Cell body
Receive stimuli and convey nerve impulses
Dendrite
Conducts impulses from the neuron to the dendrites of another neuron
Axon
