6a - Autonomic Nervous System

Ganglia 16 5 routes of sympathetic axons

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Unformatted text preview: tic Axons Preganglionic neuron Postganglionic neuron Dorsal root ganglion Preganglionic axon in a spinal nerve Preganglionic axon in a spinal nerve Sympathetic chain ganglion Ventral root Sympathetic chain ganglion Sympathetic nerve Postganglionic axon in a spinal nerve leaves dif fer en ce: po stg synapse an gdo level or es travel up no t ree nte enters spinal nerve Heart Postganglionic axon 16-6 Routes of Sympathetic Axons Preganglionic axon in a spinal nerve Preganglionic axon in a spinal nerve Sympathetic chain ganglion Sympathetic chain ganglion Splanchnic nerve me dul la Adrenal gland Preganglionic axon Splanchnic nerve Collateral ganglion Collateral ganglion Postganglionic axon Preganglionic axon dentrites or axons but when stimulate d releasse epinephri effect ors: in minop elivic region Viscera 16-7 Parasympathetic Preganglionic neuron Postganglionic neuron • Craniosacral division • Cranial Nerves III, VII, oculomoter, IX, X facial, Cranial nerves many branches - • pelvic nerves glossophary ngral,vagus Midbrain Pons Brainstem Medulla smooth muscle cilairy muscles of eye, tears nasal secretions salivary, parotid gland, heart pulmonary tract gi tract midpoint to colon Postganglionic neurons Terminal ganglia Preganglionic neurons Sacral region of spinal cord (S2–S4) Pelvic nerves 16-8 Enteric • Nerve plexuses in the wall of the digestive tract • 3 points of nervous input into the digestive tract: 1. digestive CNS sensory neurons, about homeostasis of digestive system 2. ANS motor neurons connect the CNS tract digestive smooth muscles gland and secretions 3. Enteric neurons – control through autonomic reflexes without input thorugh cns, local reflex loops 16-9 Enteric • Major types of enteric neurons 1. Enteric sensory neurons – stretch, chemical composition main...
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