Create a pathway of the autonomic NS using the image above and include other inf

Question

Create a pathway of the autonomic NS using the image above and include other information that you have learned/know.

Thank you.

SOMATIC MOTOR PATHWAY ACh Nicotinic receptor CNS skeletal muscle AUTONOMIC PATHWAYS (a) Parasympathetic Pathway Ganglion Muscarinic receptor CNS Autonomic targets: Smooth and cardiac muscles e Some endocrine and ACh exocrine glands e Some adipose tissue Nicotinic receptor ) Sympathetic Pathway Nicotinic receptor a receptor CNS 31 receptor- eceptor E Q FIGURE QUESTIONS ACh (c) Adrenal Sympathetic Pathway Using the figure, compare: (a) number of neurons in somatic CNS motor and autonomic pathways b) receptors on target cells of somatic Adrenal medulla motor, sympathetic, and Blood vessel Adrenal cortex (c) neurotransmitters used on target KEY cells of somatic motor, sympathetic, and parasympathetic pathways ACh acetyicholine AE -epinephrine ?NE norepinephrine d) receptor subtypes for epinephrine with subtypes for norepinephrine

Explanation / Answer

Somatic motor pathway:

When a pain stimuli recieved by sensory neuron, conduct it in to central nervous system and reaches the cerebral cortex where pain is interpreted. After stimuli are processed, the impulses are conducted from cerebral cortex to spinal cord. From the spinal cord somatic motor neuron carry the impulse and reach neuromuscular junction where it release acetyle choline. This acetyle choline bind to nicotinic receptors on the muscle and stimulate the muscle to contract to escape from pain stimuli.

Parasymathetic pathway:

The preganglionic fibers carry impulse either from brain stem or sacral of spinal cord. This preganglionic fibre synaps with parasympathetic ganglion located adjacent to or within the target organ. Thus parasympathetic preganglionic fibers are quite long. The preganglionic fiber release acetylecholine, which bind to nicotinic receptor present on ganglia. This stimulate post ganglionic fiber. Postganglionic fiber travel short distance between ganglia and target tissue. Post ganglionic fiber release acetyle choline at the target tissue. The acetyl choline bind to muscarinic receptor on target tissue and produce a response.

Sympathetic pathway:

The preganglionic nerve carry impulse from between segments of spinal cord between T1 and L2. Upon exiting the spinal cord the nerve enter a chain of ganglia adjacent to spinal cord called sypathetic chain. So the preganglionic nerve is short in sympathetic system. Preganglionic nerve release acetyle choline and acetyle choline bind to nicotinic receptors of ganglia. From the ganglia post ganglionic nerve carry impulse and travel to their target organ. At the target post ganglionic neuron release norepinephrine and bind to alpha and beta 1 receptors and produce a response in the target tissue.

Adrenal sympathetic pathway:

Once body recieve a sensory information, the sympathetic nervous system send a signal to preganglionic nerve. This nerve release acetyle choline in the adrenal gland and activate adrenal medulla. Then adrenal medulla directly release epinephrine and norepinephrine in to the blood by post ganglionic nerve fiber and these bind to beta receptors of target tissue and produce response.

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