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Most of the viscera get nerve supply from both sympathetic and parasympathetic systems.

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What fibers are the sweat glands innervated by?

Sweat glands are innervated by adrenergic sympathetic nerve fibers from the autonomic nervous system. These fibers release norepinephrine, which stimulates the sweat glands to produce sweat.


Which finger's nerves connect to the heart?

The heart is innervated by parasympathetic and sympathetic fibers.


What parts of the body receive only sympathetic fibers?

adrenal medulla, sweat glands, arrector pili muscles of the skin, kidneys, most blood vessels


What nerves supply the innervation of the bladder and the internal sphincter?

The bladder is innervated by the parasympathetic fibers of the pelvic splanchnic nerves (S2-S4) which stimulate contraction of the detrusor muscle. The internal urethral sphincter is innervated by sympathetic fibers from the hypogastric nerve, which cause it to contract and prevent urine leakage.


Do Sympathetic nerve fibers penetrate the aortic arch?

Yes, sympathetic nerve fibers penetrate the aortic arch along with the branches of the vagus nerve. These fibers help regulate heart rate and blood pressure by influencing the contractions of the heart and the diameter of blood vessels.


What innervates the heart?

The heart is innervated by vagal and sympathetic fibers. The right vagus nerve primarily innervates the SA node, whereas the left vagus innervates the AV node; however, there can be significant overlap in the anatomical distribution. Atrial muscle is also innervated by vagal efferents, whereas the ventricular myocardium is only sparsely innervated by vagal efferents. Sympathetic efferent nerves are present throughout the atria (especially in the SA node) and ventricles, including the conduction system of the heart.


What is the relationship between the number of motor neurons recruited and the number of skeletal muscle fibers innervated?

Typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron.Completed


Do the post-ganglionic sympathetic fibers release acetylcholine?

No, post-ganglionic sympathetic fibers mostly release norepinephrine. But they do release some ACh to the sweat glands, which causes concurrent vasodilation of surrounding blood vessels (paired with release of bradykinin from sweat glands).


What is innervated by postganglionic fibers arising from the cervical ganglia?

the eyes


What part of the body receives sympathetic fibers?

adrenal medulla, sweat glands, arrector pili muscles of the skin, kidneys, most blood vessels


The ureter is innervated by parasympathetic nerve endings only?

No, the abdominal part of it has the same inervation as kidneys and the pelvic part gets is simpat. and senc. inervation from plexus hypogastricus inf. and parasimpat. inervation from S2-S4 segments


How can sympathetic and parasympathetic fibers exert antagonistic effects?

Sympathetic fibers convey impulses that stimulate our "fight or flight" response. Parasympathetic are just the opposite, you might say they are for "rest and digest". They are both firing at the same time but depending on your environment and emotional state, one will dominate over the other. Sympathetic and parasympathetic fibers release different neurotransmitters, which bind to different receptors. Three structures that receive sympathetic innervation are the adrenal glands, arrector pilli muscles, and sweat glands.