Q. What do you mean by Nervous System?
Structural Organization: CNS + PNS
Functional Organization: only concerned with PNS
Sensory (Afferent) -> CNS
Motor (Efferent) <- CNS
Nervous Tissue:
Two principal tissues: Neurons and Supporting Cells (Neuroglia)
- Neurons: Highly specialized to transmit messages (impulses). Vary greatly in shapes, however share common features. These include Dendrites, Cell Body, Axons, and Axon Terminals
- Glia: Different types of cells that generally support, insulate, and protect the delicate neurons. Note that glia still divide during adult life (Gliomas/brain tumors). Some of these cells form the myelin layer, others make CSF.