Efferent Division

Efferent Division - Efferent Division of the Nervous System...

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Efferent Division of the Nervous System - CNS to Effectors - Autonomic and Somatic
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Autonomic Nervous System 2 Branches Sympathetic: “Fight-or-Flight” (stressful situations) Parasympathetic: “Resting and Digesting” (Not always extreme cases; fluctuate between the 2) Mediated by hypothalamus, medulla, pons, limbic system, cerebral cortex
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Figure 11-1
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Figure 11-3
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Antagonistic control - opposing actions at same effector Sympathetic – increases heart rate Parasympathetic – decreases heart rate Some effectors only ↑ or ↓ sympathetic influence Increase or decrease sympathetic control over smooth muscle contraction in walls of blood vessel to change blood flow and pressure
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Autonomic Efferent Pathway 2 motor (efferent) neurons Preganglionic – originates in CNS Postganglionic – synapses with effector Synapse between the 2 neurons occurs at a ganglion (collection of cell bodies in PNS) Differences between parasympathetic + sympathetic
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Figure 11-4
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Sympathetic Preganglionic Neuron CNS origin Thoracic and lumbar regions of spinal cord Thoracolumbar outflow Short in length Synapses close to spinal cord exit Cholinergic neuron NT = Acetylcholine (ACh)
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Sympathetic Ganglia Paravertebral ganglia (sympathetic trunk) – located just outside spinal cord on either side Prevertebral ganglia – located along descending (abdominal) aorta 1 preganglionic : many postganglionics (Divergence) ACh binds to Nicotinic receptors on postganglionic neuron
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Figure 11-5
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Efferent Division - Efferent Division of the Nervous System...

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