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Doctor insights on: Structure Of Optic Nerve

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Function of the optic nerve?

Function of the optic nerve?

Optic nerve: The optic nerve carries the signal from the retina to the brain. ...Read more

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Nerve (Definition)

The brain and spinal cord communicates with what is occurring in the internal organs and limbs by nerve fibers where are like electrical wires with insulation (myelin) and the "copper" (axon). Within brain and spinal cord these nerves connect to other nerves via synapses on both axons and dendrites. A nerve can carry information regarding sensations, and ...Read more


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Optic nerve damage in the eye?

Optic nerve damage in the eye?

Optic nerves: A thorough exam can help determine the extent of the damage in many cases along with visual field and oct testing. A neuroophthalmic exam may be required in addition to an MRI or ct scan in some cases. ...Read more

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Each peripheral nerve provides what innervation to peripheral structures.?

Each peripheral nerve provides what innervation to peripheral structures.?

Good question: I wish I could remember. When I have a question about that, I get out my old anatomy book from med school and look it up. The book is 1100 pages long. I refer to it frequently when I want to relearn what peripheral nerve innervates what structure. For laypeople I recommend Frank Netter's Atlas of Human Anatomy. It's available from Amazon. ...Read more

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What can thickening of the optic nerve indicate?

What can thickening of the optic nerve indicate?

Nonspecific: Hi! Lots of things to consider; what symptoms prompted you to get the scan? Any change in vision? Sinus pain or congestion? Bone pain elsewhere in your body? Headaches? Fever? I would definitely recommend close follow-up with a physician to do careful examination of your eyes and head/neck. ...Read more

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Can optic neuritis possibly cause protrusion of the affected eye?

Can optic neuritis possibly cause protrusion of the affected eye?

No : Unilateral exophthalmos, protrusion of one eye, is most likely a result of thyroid disease. Other causes include inflammation ANS infection of tissues or sinuses around the eye and rarely tumors of the tissues around the eye, the optic nerve and the eye. ...Read more

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Optic nerve crushed, optic nerve transplant?

Optic nerve crushed, optic nerve transplant?

No recourse: A crushed optic nerve (how did this happen to you?) causes permanent changes which will alter the vision sometimes severely. There is currently no treatment known for this and a transplant is not possible. A discussion with a neuro-ophthalmologist would be helpful in this situation. ...Read more

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What is a posterior subcapsular cataract and ischemia of the optic nerve?

What is a posterior subcapsular cataract and ischemia of the optic nerve?

2 different things: There are many types of cataract. Posterior subcapsular cataract refers to cloudiness on the back part of the lens just under the capsule. This may be caused by injury, steroids, elevated blood sugar and aging. Ischemia of the optic nerve means that there is or was an episode of poor blood flow to the nerve which may result in vision loss. ...Read more

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What is a posterior subcapsular cataract and ischemia of the optic nerve?

What is a posterior subcapsular cataract and ischemia of the optic nerve?

2 different things: Posterior subcapsular cataract is a change in the lens transparency from deposits and alteration of the back capsule of the lens. Ischemia of the optic nerve is deficiency of the blood supply to the main nerve of sight with loss of vision. ...Read more

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Is nerve injury the same as nerve damage or spinal cord damage?

Is nerve injury the same as nerve damage or spinal cord damage?

Possibly: Nerve injury implies some kind of damage to the nerve itself. While spinal cord and nerves are both nervous tissue, nerves typically are structures that have branched outside the spinal cord. Injury to the sciatic nerve, for example, is not considered a spinal cord injury. They are very different structures. ...Read more

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Is ilioinguinal nerve the same size as sciatic nerve?Saw mr neurography image of the sciatic nerve.Can ilioinguinal nerve appear that clearly on mrn?

Not likely: The sciatic nerve is anatomically larger than the ilioinguinal nerve. Mrn is not widely available. The ilioinguinal nerve is not as likely to be seen as clearly on mrn as the sciatic nerve. ...Read more

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Which of the knee joint structures are not supplied by a sensory nerve?!

Which of the knee joint structures are not supplied by a sensory nerve?!

Most: Ligaments have nerves that assess tension and position, subchondral bone has sensory nerves, peripheral meniscus, and synovium are all pain sources. The articulate cartilage itself has no nerves. ...Read more

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What are the main causes of optic nerve damage.

What are the main causes of optic nerve damage.

see details: Multiple sclerosis is a common cause. Other causes include trauma, infection, emboli (blood clots), vascultis or infarctions. ...Read more

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What is the history of optic neuritis?

Short term for most: I am going to assume you mean its normal clinical course, not how it was discovered. On is an inflammation of the nerve that causes a rapid drop in vision and color discrimination over a few days with vision recovery in 2-3 weeks for most. Repeat episodes (as in ms) can cause incremental on damage and vision reduction. Iv or oral steroids are sometimes used to treat on. ...Read more

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Explain the optic nerve?

Visual cable: The optic nerve, the head of which is described in the back of the eye by your ophthalmologist as the disc, is the cable carrying visual information into the brain where it ends up in the occipital lobe and interpreted as vision. It contains over 1.2 million fibers as well as supporting elements.A truly amazing nerve. ...Read more

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What is the significance of MRI findings of amount of fat surrounding exiting nerve roots of spine?

What is the significance of MRI findings of amount of fat surrounding exiting nerve roots of spine?

Nerve fat: Each nerve has a ring of protective fat around it on MRI this seen as a bright signal so a ring of brightness around a nerve is normal and good to little fat around the nerve implies crowding or pressure contact of something other than fat like bone or disc. Ouch. ...Read more

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What are the functions of the optic nerve, the retina, the iris, the cornea, and the pupil?

What are the functions of the optic nerve, the retina, the iris, the cornea, and the pupil?

The visual pathway: Light passes through the cornea, which is the front "windshield" of the eye and helps focus the light. The iris works as a muscle to increase or decrease the size of the pupil; this controls how much light comes into the eye. Light hits the retina, which converts the light into signals which are sent, via the optic nerve, to your brain. ...Read more

Optic Nerve (Definition)

The optic nerve receives input from the retina and transmits information to the optic chasm and ultimately the occipital lobe of brain so that images can be ...Read more