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The scleral ring or sclerotic ring is a hardened ring of plates, often derived from bone, that is found in the eyes of many animals in several groups of vertebrates. Some species of mammals, amphibians, and crocodilians lack scleral rings. [1] The ring is in the fibrous outer layer of the eye, called the sclera.
Drawing of sclerotic lesions from Babinski's thesis "Etude anatomique et clinique de la sclérose en plaques", 1885. Multiple sclerosis (MS) can be pathologically defined as the presence of distributed glial scars in the central nervous system that must show dissemination in time (DIT) and in space (DIS) to be considered MS lesions.
Sclerosis (from Ancient Greek σκληρός (sklērós) 'hard') is the stiffening of a tissue or anatomical feature, usually caused by a replacement of the normal organ-specific tissue with connective tissue.
This could indicate that some number of lesions exist, below which the brain is capable of repairing itself without producing noticeable consequences. [1] Another process involved in the creation of lesions is an abnormal increase in the number of astrocytes due to the destruction of nearby neurons. [1] A number of lesion patterns have been ...
In many vertebrates, the sclera is reinforced with plates of cartilage or bone, together forming a circular structure called the sclerotic ring. In primitive fish, this ring consists of four plates, but the number is lower in many living ray-finned fishes , and much higher in lobe-finned fishes , crocodilians , various reptiles , and birds .
[10] and axon destruction. [11] Multiple sclerosis differs from other idiopathic inflammatory demyelinating diseases in its confluent subpial cortical lesions. These types of lesions are the most specific finding for MS, being exclusively present in MS patients, though currently they can only be detected at autopsy. [12]
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Initially, there is a marked increase in the rate of bone resorption in localized areas, caused by large and numerous osteoclasts. Radiographs at this phase show lucency in the affected bone. These localized areas of pathological destruction of bone tissue (osteolysis) are seen radiologically as an advancing lytic wedge in long bones or the skull.