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60 Cards in this Set

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ANS
Regulates activity of smooth muscle, cardiac muscle, and certian glands
Structures involved in ANS
General Visceral Afferent and efferent neurons, and the integration center within the brain
ANS recieves input from where?
Limbic System and Cerebrum
Somatic Nervous System V. ANS
Conciously percieves sensation, Excitatin of skeletal muscle
ANS V. SNS
Unconciously percieves visceral sensation, involuntary inhabition or excitation of smooth, cardiac, and glands
Number of neurons involved in ANS Pathway?
2. Myelinated Pre-Ganglionic and Unmyelenated Post-Ganglionic.
PreGanglionic Neuron
Begins at Cell body of brain or spinal cord Lateral Horn of Grey Matter. Type B fiber
PostGanglionic Neuron
Cell body lies outside of CNS in an Autonmic ganglion. Unmyelinated Type C fiber that ends at visceral effector
Divisions of the ANS
Sympathetic (Fight or Flight) -Thoracic and Lumbar segments. Parasympathetic (Rest and Repose)- Preganglionic fibers leaving the brain and sacral segments
Sympathetic Pathway
Short Preganglionic neuron, to ganglion, longer postganglionic neuron. Uses ACh, N-Ep, and EP
Parasympathetic Pathway
Longer Preganglionic Neuron, to ganglion which very close or on effector, short postganglionic neuron. Uses only ACh
SNS Sensory Input
Special Senses and Somatic Senses
ANS Sensory Input
Mainly from Interoceptors. some from special and somatic senses.
SNS Control of Motor Output
Voluntary contrl from Cerebral Cortex, with contributions from basal ganglia, cerebellum, brain stem, and spinal cord.
ANS Control of Motor Output
Involuntary control from limbic system, hypothalamus, brain stem, and spinal cord. Limited control from cerebral cortex
SNS Effectors
Skeletal Muscle
ANS Effectors
Smooth muscle, cardiac muscle and glands
SNS Responses
Contraction of Skeletal Muscle
ANS Responses
Contraction/relaxation of Smooth and cardiac muscle, secretion of glands.
Sympathetic Ganglia
Trunk (chain) Ganglia near vertebral bodies. Prevertebral ganglia near large blood vessels in gut
Parasympathetic Ganglia
Terminal ganglia at wall of organ
Autonomic Plexuses
Tangled networks of sympathetic and parasympahtetic neurons
Sympathetic Effects
Increased metabolism, respiratory and heart rate. Decreased digestive. Specialized neurons in adrenal glands
Rami Communicantes
White - Myel - Preganglionic
Gray - Unmel - Postganglionic
Smypathetic Ghain Ganglia
(Paravertebral Ganglia) Control effectors in the body wall, head, neck and limbs of thoracic activity
Sympathetic Collateral Ganglia
(Prevertebral Ganglia) Ganglionic Neurons that innervate tissues and organs in the abdominopelvic cavity
Sympathetic Adrenal
Release Neurotransmitters into the bloodstream where they act as hormones
Spinal Nerve Route
Out the same level
Smypathetic Chain Route
Up chain and out Spinal Nerve
Prevertebral Ganglion Route
Out Splanchnic nerve to collateral ganglion
Structures innervated by Spinal Nerves
Sweat Glands, Arrector Pilli, Blood vessels to skin and skeletal
Thoracic and Cranial Plexuses supply
Heart, lungs, esophagus and thoracic blood vessels
Splanchnic Nerves to prevertebral ganglia Supply
GI Tract from Stomach to rectum, urinary and Reproductive organs
Ventral Root of the Thoracic Spinal Nerve Damage
No sypmathetic motor function on the affected side of the head, neck, or trunk
Ventral roots of Cervical spinal nerves are damaged
Produce voluntary muscle paralysis on the affected side leaving sympathetic funciton intact
Preganglionic cell bodies of Parasympathitic NS found in
4 Cranial nerve nuclei in brain stem and S2-S4 spinal cord
Oculomotor Nerve III (PNS)
Ciliary muscle and pupillary constricotor muscle inside eyeball
Facial Nerve VII (PNS)
Supply tears, salivary and nasal secretions
Glossopharyngeal Nerve IX (PNS)
Otic ganglion supplies parotid salivary gland
Vagus Nerve X (PNS)
Heart, pulmonary and GI Tract as far as the midpoint of colon
Parasympathetic Sacral Nerve Fibers
Form pelvic Splanchnic Nerves, Innervate smooth muscle and glands in colon, ureters, bladder and reproductive organs
Cholinergenic Neurons of ANS
Release ACh from Preganglionic and parasympathetic postganglionic neurons
Nicotonic receptors are found on?
dendrites and cell bodies of ANS cells and at NMJ
Muscarinic Receptors are found on?
Plasma membranes of all parasympathetic effectors
All parasympathetic fibers release?
ACh
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