Autonomic%20Nervous%20System%20Lecture%20Notes%20-%20Anthony%20Nicholson

Autonomic%20Nervous%20System%20Lecture%20Notes%20-%20Anthony%20Nicholson

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
5/20/09 1 Autonomic Nervous System Anthony Nicholson, B.Sc. M.Chiro. D.A.C.N.B Spine Partners Wahroonga Wahroonga Specialist Centre 13/176 Fox Valley Road Wahroonga NSW 2076 www.spinepartners.com.au 1 Basic Function of the ANS • That part of the nervous system that maintains homeostasis and promotes survivability by delivering blood, food and oxygen • There is an embryological relationship between the ANS and the neural tissues that sense external environment – lateral crest cells • Any activation of sensory ganglia will activate autonomic neurons for a corresponding response in fuel delivery 2 ANS • ANS is basically a visceral sensory and motor system • Also referred to as the involuntary motor system in contrast to voluntary (somatic) motor system • Whereas somatic motor system innervates skeletal muscle the ANS innervates: – Cardiac Muscle – Smooth Muscle – Glands 3 Central Circuitry of ANS • Central Autonomic Network (CAN) • Insula – primary viscerosensory cortex • Ventromedial and prefrontal cortices and anterior cingulate initiate ANS responses associated with affective behaviour • Amygdala receives exteroreceptive and interoreceptive information and tags it with emotional signi±cance • Hypothalamus – integrates autonomic and endocrine responses critical for homeostasis 4
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5/20/09 2 ANS Outfow • Sympathetic • Parasympathetic • Cell Bodies – Primary (Preganglionic) • located in brainstem nuclei and Intermediolateral column oF spinal cord – Secondary ( Postganglionic) • Located in the autonomic ganglia 5 Both SNS and PNS have two neurons in series in the motor outfow. In the parasympathetic system the ganglion is a small structure embedded in the target organ, not a separate structure like the sympathetic ganglia. BOTH neurons in the parasympathetic outfow are cholinergic. The second neuron acts on MUSCARINIC cholinergic receptors (not nicotinic). 6 SNS Preganglionic Neurons Located in IML column oF spinal cord T1-L2/3 Mostly myelinated B ±bres Accompany ventral roots Axons Form white communicating rami that may: 1. Synapse in paravertebral ganglia at same level 2. May pass up or down sympathetic to synapse at another level 3. Pass directly to the prevertebral ganglia 4. Synapse directly on the adrenal medulla 7 SNS Postganglionic Neurons • Mostly unmyelinated C ±bres • Axons Form gray communicating rami and then course with all spinal nerves • PerForm Following basic Functions in peripheral
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

Page1 / 9

Autonomic%20Nervous%20System%20Lecture%20Notes%20-%20Anthony%20Nicholson

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online