view-6.php - The Peripheral Nervous System: Efferent...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
The Peripheral Nervous System: Efferent Division Chapter 7
Background image of page 1

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

View Full DocumentRight Arrow Icon
EFFERENT NEURONS Send signals from (Exit) the CNS out to Two branches of the Efferent Division The Autonomic Branch The Somatic Branch
Background image of page 2
THE AUTONOMIC NS Its major functions deal with Homeostasis. The autonomic nervous system (ANS) innervates cardiac and smooth muscle, most exocrine glands and some endocrine glands. The ANS releases only two different neurotransmitters on the structures it controls: ACETYLCHOLINE and NOREPHRINE. There are two sub-divisions of the ANS
Background image of page 3

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

View Full DocumentRight Arrow Icon
The Divisions of the ANS are the Sympathetic and Parasympathetic Nervous Systems . Sympathetic nerve fibers originate from the thoracic and lumbar levels of the spinal cord. Its preganglionic fibers are short. Its postganglionic fibers are long, terminating at effectors. They release NOREPHRINE
Background image of page 4
Para-Sympathetic Division Parasympathetic nerve fibers originate from the cranial and sacral levels of the CNS. Its preganglionic fibers are long. Its postganglionic fibers are short, terminating at effectors. They release ACETYLCHOLINE
Background image of page 5

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

View Full DocumentRight Arrow Icon
Nerve Connections between the CNS and the ANS effector organs There is a fast, two neuron relay system. One neuron originates in the CNS (preganglionic) and synapses outside the CNS with the postganglionic neuron. The second neuron (postganglionic) goes directly to the effector organ. This provides for very fast (rapid) communication between the CNS and effectors.
Background image of page 6
Central nervous system Preganglionic fiber Preganglionic Neurotransmitter Acetylcholine Posganglionic fiber Varicosity Posganglionic Neurotransmitter Sympathetic = Norephrine ParaSympathetic = ACH Effector organ Autonomic ganglion
Background image of page 7

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

View Full DocumentRight Arrow Icon
The Neuro-Transmitters of the ANS Parasympathetic postganglionic fibers release ACh. They are called: cholinergic fibers. Sympathetic postganglionic fibers
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 27

view-6.php - The Peripheral Nervous System: Efferent...

This preview shows document pages 1 - 9. Sign up to view the full document.

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