| 词汇 | fourth-ventricle |
| 释义 | fourth ventricle noun[ Cusually singular ] anatomy specializeduk /ˌfɔːθ ˈven.trɪ.kəl/ us /ˌfɔːrθ ˈven.trɪ.kəl/ a ventricle(= space) at the bottom and back of the brain that contains cerebrospinal fluid(= liquid that moves around the brain and spinal cord) and that is connected to the third ventricle and the spinal cord: There are two lateral ventricles and midline third and fourth ventricles. From the fourth ventricle, the cerebrospinal fluid leaves through foramina in the brain stem to circulate down around the spinal cord and over the surface of the brain. Symptoms are mainly due to increased intracranial pressure due to blockage of the fourth ventricle. In the first case, the tumour was in the fourth ventricle. The cerebral aqueduct is a narrow canal through the midbrain, connecting the third and fourth ventricles, and through which cerebrospinal fluid flows. The brain & nervous system abducens nerve abducent nerve accessory nerve alexithymia allism grey matter hemispheric hemispherical hindbrain hippocampus neurogenic neurogenically neuroglia neuroglial neurohormonal reticular formation rhinencephalon rhombencephalon right brain right-brained Comparethird ventricle lateral ventricle |
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