extrapyramidal disease n.
A degenerative disease, such as Parkinsonism or chorea, that affects the corpus striatum of the brain or other part of the extrapyramidal motor system and is characterized by tremor, muscular rigidity or weakness, and involuntary movements.
- Extrapyramidal motor system
extrapyramidal motor system n. Any of the various brain structures affecting bodily movement, excluding the motor neurons, the motor cortex, and the pyramidal tract, and including the corpus striatum, its substantia nigra and subthalamic nucleus, and its connections with the midbrain.
noun, Anatomy. 1. the part of the central nervous system, including the descending motor fibers other than those of the pyramidal tract, that regulates muscle tone, posture, and other aspects of body movement.
- Extrasaccular hernia
extrasaccular hernia ex·tra·sac·cu·lar hernia (ěk’strə-sāk’yə-lər) n. See sliding hernia.
[ek-struh-sen-sawr-ee-uh l, -sohr-] /ˌɛk strə sɛnˈsɔr i əl, -ˈsoʊr-/ adjective 1. .