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Parasympathetic fibers of which nerve innervate smooth muscles of the lens of the eye - the eye muscles that cause the eye to bulge to accommodate close vision?
Lynnheuschkel
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∙ 13y ago
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What do somatic nerve fibers innervate?
I believe the answer is skeletal muscles.
What fibers innervate sweat glands?
Sympathetic fibers innervate sweat glands.
What fibers carry information from the skin joints and skeletal muscles to the central nervous system?
parasympathetic
Is mydriasis parasympathetic or sympathetic?
the parasympathetic fibers of the cranial nerve number three.
What carries cardiac impulses to the myocardium?
Purkinje Fibers
What nerves innervate the heart?
vagus nerve and sympathetic fibers
What secretes norepinephrine adrenergic fibers?
sympathetic division. Parasympathetic division fibers called cholinergic fibers release acetylcholine.
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.
A pelvic splanchnic nerve contains?
preganglionic parasympathetic fibers
Postganglionic axons secrete acetylcholine cholinergic fibers?
Parasympathetic
Does the oculomotor nerve have motor fibers?
Yes it is motor and parasympathetic.
What part of the PNS controls the pupillary response?
Pupillary response is controlled by the autonomic nervous system.In bright light or when looking at close objects, the parasympathetic nervous system will cause pupillary constriction by activating the sphincter pupillae muscle(s). The parasympathetic nerves that innervate the sphincter pupillae are the short ciliary nerves, which come from the ciliary ganglion in the orbit. Innervation of the ciliary ganglion is via parasympathetic pre-ganglionic fibers traveling with the occulomoter nerve from the edinger-westfall nucleus in the cranial midbrain.In low light, when looking at distant objects, or when stress levels are high (fight or flight) the sympathetic nervous system will cause pupillary dilation by activating the iris dilator muscle(s). The sympathetic nerves that innervate these muscles come from the superior cervical ganglion.
