| periventricular fibres | A heterogeneous system of thin nerve fibres in the periventricular gray matter of the hypothalamus; the dorsal longitudinal fasciculus is a caudal continuation of the system. Synonym: fibrae periventriculares. (05 Mar 2000) |
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| posterior periventricular nucleus | A nucleus located in the middle hypothalamus in the most ventral part of the third ventricle near the entrance of the infundibular recess. Its small cells are in close contact with the ependyma. (12 Dec 1998) |
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| leukomalacia, periventricular | A disease of premature or newborn infants hypoxic and ischemic in nature and leading to infarction of brain white matter and cerebral ventricle enlargement. (12 Dec 1998) |