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Biomedical subjects

N Okamoto

Publications and source records attributed to N Okamoto.

At least 307 records · Page 17Linked to original sources
PubMed1980

H-reflex of the upper extremities in cervical myelopathy.

A study was made of the H-reflex in the upper extremities to express objectively the degree of spastic paralysis in cases of cervical myelopathy. This reflex cannot normally be elicited in healthy persons. The H-reflex was elicited in 63 out of 80 patients with advanced symptoms of cervical myelopathy and was most frequently recorded from the median nerve. The H/M amplitude ratio is used to express the degree of spastic paralysis, the higher the ratio the more severe the dysfunction. The longer the clinical history the greater the tendency for the H-type of reflex to change to the HF-type and the higher the H/M amplitude ratio. The decrease rate of the pre- and post-operative H-reflex was high amongst soft disc cases whilst that in spondylosis and ossification of the posterior longitudinal ligament was low compared to the improvement in symptoms. It is concluded that the H-reflex in the upper extremities is a good method of expressing the degree of spastic paralysis in cervical myelopathy.

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PubMed1980

A case of mesenchymal chondrosarcoma of the orbit.

A case of mesenchymal chondrosarcoma occurring in the right orbit of a 84-year-old Japanese female was reported. The ultrastructural findings of tumour are composed of three cell types: well-differentiated cartilaginous cells, undifferentiated cells and transitional cells. The well-differentiated cells showed scalloped cytoplasmic membranes, numerous mitochondria showing dense electron matrix, various size of lipid granules, and abundant amount of extracellular matrix. The extracellular matrix were collagen fibres and ground substances and matrix vesicle. The undifferentiated cells showed smooth cytoplasmic membranes, large nuclei resembling primitive mesenchymal cells.

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