Iqraabout 1 year ago
Nodes of ranvier / Gaps between myelin sheath
Your myelin sheath isn’t one solid covering. It’s a lineup of individual sections of myelin, each separated from the next by a tiny gap — like the small amount of space you see between individual box cars on one long train. Each section of myelin is called an internode. Each gap in the myelin sheath — between internodes — is called the nodes of Ranvier. The nodes of Ranvier are rich in positive sodium ions. As the electrical signal or impulse travels along the axon, it jumps from one node to the next. When passing over the gap, the sodium ions recharge the electrical signal so it can continue in its travel without losing its charge or lessening in signal strength.
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Magnolia Senior Living, Assisted Living, & Memory Care Facility in Texas | Valiente Senior Living & Memory Care TomballdiagnosisWelcomeMeningitis is an infection and swelling, called inflammation, of the fluid and membranes around the brain and spinal cord. These membranes are called meninges.
The inflammation from meningitis most often triggers symptoms such as headache, fever and a stiff neck.
Viral infections are the most common cause of meningitis in the United States. Bacteria, parasites and fungi also can cause it. Sometimes meningitis improves in a few weeks without treatment. But meningitis also can cause death. It often needs quick treatment with antibiotics.
Seek medical care right away if you think that you or someone in your family has meningitis. For meningitis caused by bacteria, early treatment can prevent serious complications.Early meningitis symptoms may be like those of the flu. Symptoms may come on over several hours or over a few days.
Symptoms in people older than 2 years
The following may be symptoms of meningitis in people older than 2 years:
Sudden high fever.
Stiff neck.
Bad headache.
Nausea or vomiting.
Confusion or trouble concentrating.
Seizures.
Sleepiness or trouble waking.
Sensitivity to light.
No desire to eat or drink.
Skin rash sometimes, such as in meningococcal meningitis.
Symptoms in newborns and infants
The following may be symptoms of meningitis in newborns and infants:
High fever.
Constant crying.
Being very sleepy or irritable.
Trouble waking from sleep.
Being not active or sluggish.
Not waking to eat.
Poor feeding.
Vomiting.
A bulge in the soft spot on top of the baby's head.
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