function of the efferent fibers of the optic nerve of fishes by Leslie Brainerd Arey

Cover of: function of the efferent fibers of the optic nerve of fishes | Leslie Brainerd Arey

Published by [Museum of Comparative Zoölogy at Harvard College] in Cambridge, Mass .

Written in English

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Subjects:

  • Fishes -- Nervous system,
  • Optic nerve.

Edition Notes

Book details

Other titlesJournal of comparative neurology. Vol. 26, no. 3
Statementby Leslie B. Arey.
SeriesContributions from the Zoölogical Laboratory of the Museum of Comparative Zoölogy at Harvard College -- no. 276
The Physical Object
PaginationP. 213-245 :
Number of Pages245
ID Numbers
Open LibraryOL21770705M

Download function of the efferent fibers of the optic nerve of fishes

Efferent nerve fibers refer to axonal projections that exit a particular region; as opposed to afferent projections that arrive at the region. These terms have a slightly different meaning in the context of the peripheral nervous system (PNS) and central nervous system (CNS).

The efferent fiber is a long process projecting far from the neuron's body that carries nerve impulses away System: Peripheral nervous system. Key facts about the optic nerve; Parts: Intraocular part: at the optic disc, where the fibers move to the retro-orbital region. Intraorbital part: runs from the posterior part of the eyeball to the optic canal and it is surrounded by all three meningeal layers.

Intracanalicular part: inside the optic canal of the sphenoid bone. Intracranial part: travels superior to the diaphragma. The optic nerve is composed of retinal ganglion cell axons and glial human optic nerve contains betweenand million nerve fibers, which are axons of the retinal ganglion cells of one retina.

In the fovea, which has high acuity, these ganglion cells connect to as few as 5 photoreceptor cells; in other areas of retina, they connect to many thousand ates: Vision. The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II.

It is the second of several pairs of cranial nerves. Other articles where Efferent nerve fibre is discussed: nerve: categories, namely, sensory (afferent) and motor (efferent).

The fibres of these categories and their subdivisions constitute the functional components of the nerves. The combinations of such components vary in the individual cranial nerves; in the spinal nerves they are more uniform. Each optic nerve is really a bundle of about one million Ganglionic cells.

There are some types of illnesses that can affect how your optic nerves function, the most problematic being glaucoma. Other articles where Afferent nerve fibre is discussed: nerve: divided into two categories, namely, sensory (afferent) and motor (efferent).

The fibres of these categories and their subdivisions constitute the functional components of the nerves. The combinations of such components vary in the individual cranial nerves; in the spinal nerves they are more uniform.

efferent nerve: [ nerv ] a macroscopic cordlike structure of the body, comprising a collection of nerve fibers that convey impulses between a part of the central nervous system and some other body region. See Appendix and see color plates. Depending on their function, nerves are known as sensory, motor, or mixed.

Sensory nerves, sometimes. Learn term:spinal nerve = mixed afferent and efferent fibers with free interactive flashcards. Choose from 31 different sets of term:spinal nerve = mixed afferent and efferent fibers flashcards on Quizlet.

facial nerve dysfunction caused by nerve degeneration, inflammation or infection of the facial nerve. This is treatable but damage can be permanent if there is a delay in treatment.

What is the classification of CN VIII - Vestibuloacoustic. optic nerves from the eyes cross over one another, becoming the optic tracts, each of which enters the front of its corresponding tectal lobe.

This simple anatomical examination shows that the information from each eye travels directly to the tectal lobe on the opposite side. Indeed the great majority of the optic nerve fibers, the axons ofFile Size: KB.

Efferent axons in the fish optic nerve and their effect on the retinal ganglion cells. Sandeman DC, Rosenthal NP.

Recordings were taken from small bundles of axons dissected away from the otherwise intact optic nerve of the trigger fish, Hemibalistes by:   Afferent and efferent neurons are like traffic guiders for neural information. * Afferent- carries impulses into a region of interest * Efferent- carries impulses away from a region of interest For example, sensory neurons are considered afferent.

The medial and lateral efferent fibers are supposed to run within the inferior vestibular nerve, only joining the cochlear nerve at the anastomosis of Oort, a bundle of fibers running from the saccular branch of the inferior vestibular nerve to the cochlear nerve.

The efferent fibers enter the cochlea with the auditory nerve, travel Cited by:   Psychology Definition of EFFERENT NERVE FIBER: A nerve carrying impulses to the periphery.

Compare afferent nerve fibre. 2 Optic Nerve 11 • Positioning of the optic chiasm: The prefi xed chiasm(9%) lies over the tuberculum sellae, 80% over the sella turcica (L., “Turkish saddle”); the postfi xed chiasm (11%) lie s over the dorsum sellae.

• The optic chiasm (Fig. ) is loc ated below the suprachi- asmatic recess of the third ventricle, lamina terminalis,File Size: KB. nerve [nerv] a macroscopic cordlike structure of the body, comprising a collection of nerve fibers that convey impulses between a part of the central nervous system and some other body region.

See Appendix and see color plates. Depending on their function, nerves are known as sensory, motor, or mixed. Sensory nerves, sometimes called afferent nerves.

That there is an efferent system in the fish optic nerve and retina cannot now be EFFERENT AXONS IN THE FISH OPTIC NERVE 53 doubted but the functional significance remains unclear. The system is facilitatory and is therefore similar to the centrifugal fibre system found in Cited by: Optic nerve is the second of the twelve paired cranial nerves (i.e.

Cranial nerve II). It transmits visual information from retina to the brain, and is thus also known as “nerve of sight”.

It is about inches long. In the optic tracts, there are few nerve fibers that are associated with pupillary and ocular reflexes.

The optic nerve is the nerve that transmits visual information from the retina to the brain. The optic nerve is composed of retinal ganglion cell axons and support cells.

It leaves the orbit (eye. EXPERIMENTAL NEUROL () Efferent Fibers in the Frog Optic Nerve N. BRANSTON AND D. FLEMING' Division of Bio and Medical Engineering, Case Western Reserve University School of Engineering, Cleveland, Ohio Received December 4,; revision received Janu Activity was recorded extracellularly from units in the retina Cited by: There is some evidence that in fishes and amphibians efferent fibers go out from the preoptic nucleus through the optic nerve to the retina (', p.

); but I have not been able to confirm this or the claim of some authors that efferent fibers go out to the retina from the tectum. Both these connections may exist. The optic nerve is considered a cranial nerve but it is generally affected in a disease of the central nervous system known as multiple sclerosis, and, for this and other reasons, it is thought to represent an extension of the central nervous system apparatus that controls vision.

In fact, doctors can diagnose inflammation of the head of the Author: Fernando Dangond, MD. Efferent Nerve Fiber also centrifugal, or motor, nerve fiber, the nerve cell outgrowth, or axon, that together with its membrane transmits excitation from the central nervous system to such organs as the muscles and glands.

Efferent nerve fibers differ in kind—for example, they may be cranial or spinal. They may belong to the somatic or the autonomic. Article Title: Extracellular Recording of Light Responses from Optic Nerve Fibers and Caudal Photoreceptors in the Crayfish Authors: Steven C. Nesbit, Alexander G.

Van Hoof, Chi C. Le, & James R. V.S.C carries verve fibers derived from nerves of chemo receptors V.M.C carries efferent motor nerve fibers derived from facial, glosso pharyngeal and vagus nerves S.M.C carries efferent motor nerves and supply the striated.

The optic nerve is the second cranial nerve which, along with the olfactory nerve (CN I), is really an extension of the central nervous is not surrounded by Schwann cells with the first sensory bipolar cell body located peripherally in the central processes synapse on ganglion cells on the vitreous surface of the retina and their central processes pass via the.

Intracranial optic nerve • Lengthmm • Dmmm Extends post & medially ascending at an angle of 45º to join the chiasma Blood supply- pial vessels arising from ICA branches from ant cerebral and anterior communicating artery 19 Optic nerve head 4 layers of Optic Nerve Head: • Surface nerve fiber layer.

this a single nerve resulting form the fusion of the dorsal and ventral nerve roots: Spinal Nerve: sensory and motor fibers that transmit impulses in two direction is called a: Mixed Nerve: fibers in this area exit form the ventral horn and to carry motor information out of the spinal cord: Ventral (anterior) Nerve root.

The Optic Nerve is the largest sensory nerve of the eye. It carries impulses for sight from the retina to the brain. Composed of retinal nerve fivers that exit the eyeball through the optic disc, traverse the orbit, pass through the optic foramen into the cranial cavity, where they meet fibers from the other optic nerve at the optic chiasm.

Background Different classes of unmyelinated nerve fibers appear to exhibit distinct conductive properties.

We sought a criterion based on conduction properties for distinguishing sympathetic efferents and unmyelinated, primary afferents in peripheral nerves. Methodology/Principal Findings In anesthetized monkey, centrifugal or centripetal recordings were made from single.

The optic nerve component lengths are 1 mm in the globe, 24 mm in the orbit, 9 mm in the optic canal, and 16 mm in the cranial space before joining the optic chiasm.

There, partial decussation occurs and about 53% of the fibers cross to form the optic tracts. Most of these fibers terminate in the lateral geniculate body. The fibers are of two types: afferent fibers, which carry sensory impulses to the central nervous system, and efferent fibers, which carry motor impulses away from the nervous centers.

The peripheral afferent fibers originate from nerve cells located in the ganglion crest (p. ) outside the neural tube. cranial nerve functions The cranial nerve functions tab will lead to a drop down tab including all of the functions of the cranial nerves.

The cranial nerves rarely function in isolation and this text summary will clarify the role of all the nerves in the various functions of the head and eyes. Afferent neurons are also known as sensory neurons, as they transmit to the brain information derived from sensual perceptions, such as smell, touch, taste, light, etc.

Efferent neurons, on the other hand, are also known as motor neurons, because they fulfill the commands of the brain, by sending information to the various groups of muscles and fibers.6/10(9).

The optic nerve (Fig. ), or nerve of sight, consists mainly of fibers derived from the ganglionic cells of the retina. These axons terminate in arborizations around the cells in the lateral geniculate body, pulvinar, and superior colliculus which constitute the lower or primary visual centers.

The myelinated optic nerve axons pass from the optic disc of the retina through the cribriform area of the sclera and enter the skull through the optic canals of the presphenoid bone. The nerves join onto the rostroventral aspect of the brain, rostral to the hypophysis at the optic chiasm.

The optic tracts, which are continuations of CNII. and DuBois, % of all afferent fibers and % of all efferent fibers are myelinated (17). Nerve fibers of the vagus can be classified as A- B- or C-fibers (16).Cited by: 2. Immunoreactive fibers and probable nerve terminals were also found in the plexiform layer of the deep retina, within the stroma of the optic gland, and the neuropils of the optic lobe, peduncle.

What are the two types of fibers that transmit the nerve action potentials generated by excitation of any of the nociceptors.

A-delta(A δ)fibers carry well localized, sharp pain sensations and are important initiating rapid reactions to stimuli (fast pain).

Abstract. The afferent and efferent connections of the cerebellum of the primitive bony fish Acipenser baeri were studied in fixed brains with a fluorescent lipophylic carbocyanine (DiI).

The three regions of the cerebellum (the auricles, valvula, and corpus) showed similar afferents, mostly originated from extensive precerebellar populations of the midbrain tegmentum and. Optic nerve pathways: The course of the chemical and electrical impulse from light stimulating the retina as it passes from the optic nerve to the vision center of the brain.

The left and right branches of the optic nerves join behind the eyes, just in front of the pituitary gland, to form a cross-shaped structure called the optic the optic chiasma, some of the nerve fibers .Abstract The optic tectum forms the roof of the midbrain and is the primary visual center in fishes.

The retina and input from other sensory modalities (auditory, lateral line, somatosensory.

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