Optic Tract Diagram

The optic nerve The optic chiasma The optic tract The lateral geniculate body The optic radiation The visual cortex The visual association cortex. Schematic diagram of the magnocellular M and parvocellular P retinal ganglion cells projection through the lateral geniculate body to the visual cortex.

Optic Tracts With Pathology Cranial Nerves Medical Pins Human Anatomy And Physiology

It is not commonly affected by traumatic or space-occupying processes.

Optic tract diagram. The optic tract from the Latin tractus opticus is a part of the visual system in the brain. Right optic tract contains fibres from the right temporal retina and the left nasal retina. The optic tract is mainly supplied.

Here information from the nasal visual field of the left eye temporal part of the left retina is lost. Left and right optic nerves then converge at the optic chiasm. Fig 2 The nasal retinal fibres crossing over at the optic chiasm.

At the optic chiasm the nasal fibers of each optic nerve fibers carrying light impulses from the nasal side of the retina decussate while the temporal fibers do not partial decussation. The optic tract is predominantly perfused by branches of the posterior communicating and anterior choroidal arteries. These are divided into anterior and posterior pathways.

From the optic chiasm arise two optic tracts each one containing nasal fibers of the contralateral optic nerve and temporal fibers from the ipsilateral optic nerve. 322 produce atrophy of three groups of retinal ganglion cell fibers. It is a continuation of the optic nerve that relays information from the optic chiasm to the ipsilateral lateral geniculate nucleus LGN pretectal nuclei and superior colliculus.

The optic tract from the Latin tractus opticus is a part of the visual system in the brainIt is a continuation of the optic nerve that relays information from the optic chiasm to the ipsilateral lateral geniculate nucleus LGN pretectal nuclei and superior colliculus. As the optic tracts move toward the ipsilateral lateral geniculate body of the thalamus they cross. Following the decussation the visual input from the right half of the visual field will travel in the left optic tract while the stimuli from the left half of the visual field will pass through the right optic tract.

The optic chiasm is located directly above the sella turcica of the sphenoid bone. At the end of each optic tract the retinal nerve fibers connect with other visual pathway nerves in a structure called the lateral geniculate nucleus LGN located in the midbrain. It is composed of two individual tracts the left optic tract and the right optic tract each of which conveys visual.

The efferent fibres emerge as the optic radiation and ultimately travel to the primary visual cortex. Damage at site 2. Nasal half of the macula of the right eye 1red in Fig.

It begins at the area where information from the left eye and right eye cross or decussate to create a complete visual. Almost all of the axons of the left and right and left optic tracts synapse with the cells of the ipsilateral lateral geniculate nucleus. Some processing of the electrical signals occurs in the LGN before a series of radiating nerve fibers the optic radiation convey the information to the visual cortex in the posterior portion of the occipital lobe.

Optic Tract Operate Anatomy Diagram The optic tract is an extension of the optic nerve situated within the mind. The entire left optic nerve would be cut and there would be a total loss of vision from the left eye. Partial damage to the left optic nerve.

The optic tract is an extension of the optic nerve located in the brain. At the chiasm fibres from the nasal medial half of each retina cross over to the contralateral optic tract while fibres from the temporal lateral halves remain ipsilateral. Optic Tract Anatomy Function And Diagram Kenhub 2 Minute Neuroscience Optic Nerve Cranial Nerve Ii Optic Chiasm History Location Syndromes Physiology Optic Tract Anatomy Function And Diagram Kenhub Vision Introduction To Psychology Anatomy Descriptive And Applied Anatomy The Second Or Optic Chiasm Eye Muscles X.

The optic tract is an important part of the visual pathway. The optic tract about 20 to 30 mm in length is comparatively well vascularized. Once inside the skull the optic nerve travels along the floor of the middle cranial fossa through the medial aspect of the cavernous sinus.

Each tract carries fibers that are stimulated from the contralateral visual field. The anterior visual pathway refers to structures involved in vision before the lateral geniculate nucleus. The visual pathway describes the anatomical pathway by which electrical signals generated by the retina are sent to the brain fig.

Lesions of the optic tract left optic tract lesion in the example in Fig. Therefore chronic optic tract lesions will cause optic atrophy often in a characteristic pattern. The intracranial optic nerve and optic chiasm are all supplied by branches from the anterior cerebral anterior communicating and the superior hypophyseal artery - all of which also arise from the internal carotid.

It begins on the space the place data from the left eye and proper eye cross or decussate to create a whole visible image. LifeART Collection Images Copyright 1989-2001 by Lippincott Williams Wilkins Baltimore MD. About 4 of all homonymous visual field defects are due to tract disease.

Left optic tract contains fibres from the left temporal lateral retina and the right nasal medial retina. It is very unusual for visual field defects to be caused by disease in this location. Damage at site 3.

The optic tracts are the compact caudolateral continuations of the retinal ganglion layer. The pituitary gland projects down immediately behind the chiasm. The optic chiasm would be damaged.

Visual Pathway Superior schematic view of the brain optic tract and eyes demonstrating the visual pathways.

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