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Encyclopedia > Sensory root of ciliary ganglion

The ciliary ganglion is small parasympathetic ganglion lying in the orbit between the optic nerve and the lateral rectus muscle that is associated with the nasociliary nerve (a branch of the ophthalmic division of the trigeminal nerve). The ciliary ganglion is a part of the nervous pathway responsible for the constriction and dilation of the pupil as well as sensation from the cornea. Anatomy and Physiology of the A.N.S. In contrast to the voluntary nervous system, the involuntary or autonomic nervous system is responsible for homeostasis, maintaining a relatively constant internal environment by controlling such involuntary functions as digestion, respiration, and metabolism, and by modulating blood pressure. ... This is a dorsal root ganglion (DRG) from a chicken embryo (around stage of day 7) after incubation overnight in NGF growth medium stained with anti-neurofilament antibody. ... In anatomy the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... The lateral rectus muscle is a muscle in the orbit that abducts the eyeball (makes it move outwards). ... The Ophthalmic nerve is one of the three branches of the trigeminal nerve, one of the cranial nerves. ... The trigeminal nerve is the fifth (V) cranial nerve, and carries sensory information from most of the face, as well as motor supply to the muscles of mastication (the muscles enabling chewing), tensor tympani (in the middle ear) and other muscles in the floor of the mouth, such as the... The human eye The pupil is the central transparent area (showing as black). ...


It receives presynaptic fibers from the Edinger-Westphal nucleus by way of the oculomotor nerve (CN III) and in turn gives rise to postsynaptic fibers that innervate the ciliary muscle and the iris sphincter muscle. In a synapse between two neurons, the cell that releases the neurotransmitter is referred to as the presynaptic cell. ... The Edinger-Westphal nucleus is the accessory parasympathetic nucleus of the oculomotor nerve, supplying the constricting muscles of the iris. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... A synapse is a connection between two neurons: presynaptic and postsynaptic. ... The ciliary muscle is a muscle that affects zonules in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing. ... The Iris sphincter muscle is a muscle of the human body. ...


It reveives three roots: (1) sensory fibres that come directly from the nasociliary nerve, and do not synapse in the ganglion; (2) sympathetic fibres that come from the the plexus associated with the internal carotid artery and the ophthalmic artery and do not synapse in the ganglion; (3) presynaptic parasympathetic fibres from the inferior division of the oculomotor nerve (CNIII, Edinger-Westphal nucleus). The parasympathetic fibres synapse within the ganglion. (See also sense) A sensory system is a part of the nervous system that consists of sensory receptors, neural pathways, and those parts of the brain responsible for processing the information. ... The Ophthalmic nerve is one of the three branches of the trigeminal nerve, one of the cranial nerves. ... Illustration of the major elements in a prototypical synapse. ... The sympathetic nervous system (SNS) is one half of the autonomic nervous system; the parasympathetic nervous system (PNS) is the other. ... The carotid artery is a major artery of the head and neck that supplies blood to the head and neck. ... The opthalmic artery is a branch of the internal carotid artery which supplies branches to supply the eye and other structures in the orbit: Central retinal artery Supraorbital artery Supratrochlear artery Lacrimal artery Dorsal nasal artery Short posterior ciliary arteries Long posterior ciliary arteries Posterior ethmoidal artery Anterior ethmoidal artery... In a synapse between two neurons, the cell that releases the neurotransmitter is referred to as the presynaptic cell. ... The parasympathetic nervous system is one of two divisions of the autonomic nervous system. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... The Edinger-Westphal nucleus is the accessory parasympathetic nucleus of the oculomotor nerve, supplying the constricting muscles of the iris. ...


The postganglionic fibres travel via the short ciliary nerve. These include: (1) general sensory to the eye; (2) sympathetic fibres to the dilator pupillae; (3) parasympathetic fibres to the sphincter pupillae and ciliary muscles of the eye. This article needs to be cleaned up to conform to a higher standard of quality. ... The Iris dilator muscle is a muscle of the human body. ... The ciliary muscle is a muscle that affects zonules in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing. ...


  Results from FactBites:
 
Ophthalmic nerve - Wikipedia, the free encyclopedia (356 words)
Nerves of the orbit, and the ciliary ganglion.
It supplies branches to the cornea, ciliary body, and iris; to the lacrimal gland and conjunctiva; to the part of the mucous membrane of the nasal cavity; and to the skin of the eyelids, eyebrow, forehead, and nose.
It is the smallest of the three divisions of the trigeminal, and arises from the upper part of the semilunar ganglion as a short, flattened band, about 2.5 cm.
IX. Neurology. 5e. The Trigeminal Nerve. Gray, Henry. 1918. Anatomy of the Human Body. (5634 words)
The upper root ends partly in a nucleus which is situated in the pons lateral to the lower motor nucleus, and partly in the locus cæruleus; the lower root descends through the pons and medulla oblongata, and ends in the upper part of the substantia gelatinosa of Rolando.
The ciliary ganglion is connected with the ophthalmic nerve; the sphenopalatine ganglion with the maxillary nerve; and the otic and submaxillary ganglia with the mandibular nerve.
The motor root is supposed to contain sympathetic efferent fibers (preganglionic fibers) from the nucleus of the third nerve in the mid-brain to the ciliary ganglion where they form synapses with neurons whose fibers (postganglionic) pass to the Ciliary muscle and to Sphincter muscle of the pupil.
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