nervous (INTRO) Flashcards
A group of tissues composed of highly specialized cells possessing the characteristics of excitability and conductivity
NERVOUS SYSTEM
Morphological Divisions:
- Central nervous system
- Peripheral nervous system
➢ Brain
➢ Spinal cord
Central nervous system
➢ Cranial nerves (12 pairs)
➢ Spinal nerves (31 pairs)
➢ Autonomic nervous system
Peripheral nervous system
Functional Divisions of peripheral nervous system:
❖ Somatic efferent
❖ Visceral efferent
➢ Innervating _________ structures like skeletal muscles and skin.
➢ Pertaining to the body
Somatic efferent
➢ Innervating ____________ or involuntary structures like smooth muscles, cardiac muscles and glands.
➢ This is autonomic nervous system
Visceral efferent
Types Of Cell In The Nervous System:
❖ Neurons
❖ Neuroglia
➢ The active conducting elements
➢ This is the Parenchymal – functional cells
Neurons
➢ the supporting elements
Neuroglia
Neuroglia CONTAINS:
▪ Astrocyte
▪ Oligodendrocyte
▪ Microglia
▪ Ependymal cells
involve in the blood brain barrier.
Astrocyte
Produce myelin sheath in the central nervous system.
Oligodendrocyte
Phagocytic cells (protecting)
Microglia
o lining the ventricles at the brain and central canal of spinal cord.
o Flow of Cerebrospinal fluid, fluid of your brain
Ependymal cells