Author: Lorenzo Crumbie MBBS, BSc • Reviewer: Francesca Salvador MSc • Last reviewed: May 11, 2020 In the real world, the clinician will be expected to examine the entire eye.This will involve gross and magnified inspection of the eyeball, intricate assessment of the supporting structures of the eye, and assessment of all the cranial nerves … • Primary and secondary sensory neurons of … The extracranial can be divided into intraocular and intraorbital sections. The rodent extracranial optic nerve is divided into the optic nerve head, the lamina cribosa region, and unmyelinated and myelinated regions (Fig. • Optic nerve is a tract of the brain, an outgrowth of the cerebral vesicle, whose fibres possess no neurolemma [ so , doesn’t regenerate when cut ] and which is surrounded by meninges, unlike any peripheral nerve. Optic Nerve – A highway connecting the brain with the eye. Trigeminal neuralgia is a chronic pain condition that affects the trigeminal nerve, which carries sensation from your face to your brain. Optic Nerve Hypoplasia Optic nerve head appears abnormally small due to a low no. The optic nerve head is the most anterior component of the optic nerve and corresponds to the 1 mm segment that is located within the eyeball (i.e. Think of it as the highway connecting your brain and your eyes. Blood supply of optic nerve head • Surface layer of optic disc – retinal arterioles • Prelaminar region‐centripetal branches of peripapillary choroid and vessels of lamina cribrosa • Lamina cribrosa – posterior ciliary arteries and arterial circle of Zinn • Retrolaminar part – branches from central Historically, it was thought to be a raised entity protruding from the retinal surface and by extension, was referred to as a papilla (hence the term, papilloedema). The optic nerve (cranial nerve II) is the convergence of retinal ganglion cell axons that has extracranial and intracranial sections. The optic nerve is one of twelve cranial nerves but is also considered to be part of the central nervous system.It sends information from the retina to the brain.The brain forms a picture using the information so that you can see things. Methods Supraorbital approaches were performed on 10 preserved cadaveric heads (20 sides).First, 3.5-cm skin incisions were made … So any information that lands on the retina, is sent to the brain via the optic nerve. Anatomy of optic nerve 1. Branches of the optic nerve go directly to what areas of the brain? If you have trigeminal neuralgia, even mild stimulation of your face — such as from brushing your teeth or putting on makeup — may trigger a … lateral geniculate and superior colliculus ____ respond to a particular feature of a stimulus. Recent technological advances in the field of glaucoma relating to optic nerve imaging can help assist ophthalmologists in diagnosing and monitoring glaucoma in their patients. Now, damage to an optic nerve can cause vision loss. 21.15).

Images for kids • Fibers of optic nerve are very fine (2-10 µm in diameter ) & are millions in number • Surrounded by meninges unlike other peripheral nerves • Both primary & secondary neurons are in retina Morphologically and embryologically, the optic nerve is comparable to a sensory tract of … Cutting the left optic nerve in front of the optic chiasm would result in blindness in the ____. Feature detectors. ANATOMY OF OPTIC NERVE Dr.M.Sudheer Kumar Post graduate Guntur Medical College ,GUNTUR 2. However, proper clinical evaluation of the optic nerve remains the mainstay in the evaluation and diagnosis of glaucoma. the intraocular part). Improving imaging using optical coherence tomography suggests they are common and may be present in many clinically normal discs. There is one optic nerve present on the back (which is the retina) of each eye. of axons Gray or pale disc surrounded by light-colored peripapillary halo of hypopigmentation d/t concentric chorioretinal atrophy (Double Ring Sign) 74. Optic nerve head drusen are benign acellular calcium concretions that usually form early in life, just anterior to the lamina cribrosa. Cranial nerves examination: Optic nerve. The central retinal artery is the first, and one of the smaller branches of the OA and runs in the dura mater inferior to the optic nerve.

The anterior portion of the optic nerve, which includes the optic disk and the portion of the optic nerve within the scleral canal Figure 1 and Figure 2, is supplied mainly by the short posterior ciliary arteries via the choriocapillaris around the optic disk or via branches to form an anastomotic microvascular ring around the optic nerve . Objective We propose a stepwise decompression of the optic nerve (ON) through a supraorbital minicraniotomy and describe the surgical anatomy of the ON as seen through this approach.We also discuss the clinical applications of this approach.

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