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Feb 23, 2018 · The optic nerve develops from the embryonic optic stalk and contains axons originating from retinal ganglion cells. It has intraocular, intraorbital, intracanalicular, and intracranial parts. The intraocular part passes through the lamina cribrosa and expands as it acquires a myelin sheath.
Jul 16, 2023 · The optic nerve develops from the embryonic optic stalk and connects the optic vesicle to the forebrain. It begins forming in the 8th week of embryogenesis and myelination is completed shortly after birth. The optic nerve has four parts - intraocular, intraorbital, intracanalicular, and intracranial.
Jan 22, 2019 · The optic nerve has no myelin sheath and is surrounded by meninges. It transmits signals from the retina and has four parts - intraocular, intraorbital, canalicular, and intracranial. The optic nerve head contains zones like the superficial nerve fiber layer, prelaminar zone, lamina cribrosa, and retrolaminar region.
9 Intracanalicular Portion. This portion (approximately 9mm long) is the part of the nerve that travels the optic canal. Each optic canal is oriented posterosuperomedially, at an angle that approximates 45 degrees to the sagittal and horizontal planes.
In creating/revising this slide-set, I consulted the four BCSC books that have a lot to say on the subject: Fundamentals, Neuro-Oph, Path and Glaucoma. Unfortunately, all four differed from one another regarding many aspects of optic nerve anatomy.
ANATOMY AND PHYSIOLOGY OF OPTIC NERVE - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. The optic nerve carries signals from the retina to the brain.
Aug 16, 2023 · The identity of cranial nerve II (CN II), also known as the optic nerve, predates Galenic anatomy. 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. It is also involved in several reflex arcs related to the ocular system. It is a ...
Aug 9, 2014 · Anatomy • CNS fibre pathway connecting brain and retina • Axons of ganglion cells • Optic disc: ophthalmoscopically visible tip of intraocular portion of optic nerve. • 1.5х1.8 mm vertical ellipse (YELLOWISH PINK) • No receptors (blind spot) • Macula – centre of retina/centre of clinical visual field • Central 15⁰ of vision ...
Understand the aetiology and principles of management of optic neuritis. Understand the stages and importance of papilloedema. Differentiate between various types of optic atrophy. * Normal optic disc * Question The disc in question is of a 60 year old myope who is instilling timolol eye drops since the past 5 years.
3 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. partial decussation occurs and about 53% of the fibers cross to form the optic tracts. 4 Signs of optic nerve dysfunction.
