optic nerve anatomy

The optic nerve is composed of the myelinated axons of the retinal ganglion cells (RGC) and is interspersed with connective tissue septae. The optic nerve is not a peripheral nerve but a white matter tract of the central nervous system (CNS), which projects outside the confines of the cranium. There are two optic nerves, each connecting the retina within each globe to target areas within the brain. 773), or nerve of sight, consists mainly of fibers derived from the ganglionic cells of the retina.

The optic nerve is not a peripheral nerve but a white matter tract of the central nervous system (CNS), which projects outside the confines of the cranium. Known to the Greek fathers of anatomy as nervus optikus , the optic nerve has the responsibility of transmitting special afferent impulses of light to the brain. The optic disc or nerve head is the point where the axons from the retinal ganglion cells leave the eye. It is developed from the optic vesicle, an outpocketing of the forebrain.The optic nerve can therefore be considered part of the central nervous system, and examination of the nerve enables an assessment of intracranial health. The nerve head appears as a white circular structure in the back of the eye. Surrounded by meninges unlike other peripheral nerves. In the optic nerve head Arrangements of nerve fibers in optic nerve Exactly same as in retina Fibers from the peripheral part of the retina: - lie deep in the retina - occupy the most peripheral part of the optic disc Fibers originating closer to the optic nerve head: - lie superficially in the retina - occupy a more central portion of the disc It is also called the second cranial nerve or cranial nerve II. There are no photoreceptors on this structure.

Anatomy . This optic nerve travels posteromedially in the orbital cavity, passing through the optic canal in the sphenoid bone, and emerging in the middle cranial fossa. These axons terminate in arborizations around the cells in the lateral geniculate body, pulvinar, and superior colliculus which … Large pituitary tumours can cause chiasmal compression which results in bi-temporal visual field loss. ANATOMY OF OPTIC NERVE BIKASH SAPKOTA B.Optometry, Maharajgunj Medical Campus, Institute of medicine ,T.U. The optic nerve (Fig.

The optic nerve (Fig. The intraocular part of the optic nerve consists of nonmyelinated axons and appears as a semitransparent, yellowish area ( arrow ). Minimal racial differences in visual function were found, but race significantly affected optic disc topography and superior and inferior RNFL thickness measurements in healthy eyes. The optic chiasm The optic nerve lies above ( not within!)

The optic nerve ( second cranial nerve, CN II, latin: nervus opticus) is a sensory nerve, which is formed by the axons of the ganglion 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. ANATOMY OF OPTIC NERVE Dr.M.Sudheer Kumar Post graduate Guntur Medical College ,GUNTUR 2. embryologically, the optic nerve is comparable to a sensory tract of brain (white matter) because: Because the optic nerve is a central nervous system structure, it is surrounded by all 3 meningeal layers, surrounded by cerebrospinal fluid (CSF), and its axons are myelinated by oligodendrocytes. The Optic Nerve - Human Anatomy. Usually, the length of the optic nerve is 35 – 55 mm beginning from the eyeball to the chiasma. Testing this reflex can illustrate whether the optic nerve or the oculomotor nerve is damaged.

There are two optic nerves, each connecting the retina within each globe to target areas within the brain. From the cells of the lateral geniculate body and the pulvinar fibers pass to the cortical visual center, situated in the cuneus and in … Optic nerve, second cranial nerve, which carries sensory nerve impulses from the more than one million ganglion cells of the retina toward the visual centres in the brain. Optic Nerve Anatomy. Nepal 2. The optic nerve is visible posteriorly as a hypoechoic linear region radiating away from globe. Made of nerve cells, the optic nerve is located in the back of the eye. Optic nerve: Surrounded by meninges; part of central nervous system Not usually biopsied Often has psammoma bodies or drusen (calcified acellular globular concretions of nerve fibers) Site of convergence of one million axons from retinal nerve fiber layer Nerve head accounts for physiologic blind spot in normal visual field The optic nerve, meninges, and CSF together constitute the radiologic optic nerve sheath complex (ONSC). Sonographically, the normal retina cannot be differentiated from the other choroidal layers. The optic nerve provides the visual sensation and is involved in the afferent part of the pupillary and accommodation reflexes. The optic nerve (CN II) is the second cranial nerve, responsible for transmitting the special sensory information for vision.. Optic nerve head and a portion of the intraorbital segment. These changes are appreciated more along the anterior aspect of the nerve. It is also involved in several reflex arcs related to the ocular system. 5b. The optical elements within the eye focus an image onto the retina of the eye, initiating a series of chemical and electrical events within the retina.


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