DIVISIONS OF THE NERVOUS SYSTEM:
Central Nervous System (CNS)=Brain & Spinal Cord
Peripheral Nervous System (PNS)
Autonomic Nervous System=System Homeostasis
Sympathetic Nervous System=Fight or Flight
Parasympathetic Nervous System=Rest & Digest
Enteric Nervous System=GI system
3 parts of a nerve cell
Types of nerves:
Afferent Neurons=sensory, conduct impulses TO the brain
Efferent Neurons=motor, conduct impulses AWAY from the brain c.
Types of Cells in the CNS:
Oligodendrocytes-form myelin sheath of CNS
Schwann Cells-form myelin sheath of PNS
White matter vs. Gray matter
Myelin and its function
Nodes of Ranvier
Ganglion-clump of nerve cell bodies in the nerve tract
Potassium (K+) primarily inside the cell and Sodium (Na+) primarily outside the cell WHILE AT REST b.
Stimulus applied to nerve
Na+ rushes into the cell very quickly resulting in a sudden positive charge inside the cell
K+ channels are triggered to open and K+ flows out of the cell to balance the change in charge. 3.
Review the sodium-potassium pump
Rapid conduction via myelin.
Review mechanism of conduction and purpose.
Presynaptic Neuron-releases neurotransmitters into the synapse 2.
Postsynaptic Neuron-contains receptors for neurotransmitters released by presynaptic neuron. 3.
Synapse-the space between presynaptic neuron and postsynaptic neuron: where nerve cells “talk” to each other. 4.
CENTRAL NERVOUS SYSTEM (BRAIN)
Brain Stem: Medulla Oblongata, Pons, Midbrain
Diencephalon: tucked between midbrain and cerebrum
Hypothalmus (Posterior Pituitary Gland), Thalmus (emotions of pleasantness), Pineal Gland 3.
Cerebrum (cognitive function)
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