Medical Glossary

Dandy Walker

A syndrome characterized by hydrocephalus in infants associated with an abnormal closure of the passage at the foramina of Luschka and Magendie.

Decompression

To take pressure off, relieve pressure.

Diencephalon

Portion of the brain in the region of the third ventricle that includes the thalamus and hypothalamus.

Diplopia

Double vision; occurs when the two eyes are unable to fix (look at) the same point.

Dissociation of Sensation

The simultaneous preservation of light touch sensation and loss of pain and temperature sensation.

Distal

Moving further from the midline of the body.

Dorsal

Same as posterior, pertains to the back of the body.

Dura Mater

Tough outer layer of the membranes surrounding the brain and spinal cord.

Dyesthesia

Impairment in sensation. Sensation of pins and needles, loss of feeling of touch, painfulness of any sensation which is not normally painful.

Dysarthria

Speech that is difficult and poorly articulated caused by damage to a motor nerve.

Dysequilibrium

Inability to maintain proper balance.

Dysmetria

An inability to fix the range of movement in muscular activity. Rapid and brisk movements are made with more force than necessary. Often seen in cerebellar disorders.

Dysphagia

Inability to swallow or difficulty in swallowing.

Dysplastic Tonsil

Abnormal development of a cerebellar tonsil. The cerebellum base has two areas called tonsils.

Dyspnea

Labored or difficulty in breathing resulting in air hunger.
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