| 释义 |
substantia nigra Anat.|sʌbˈstænʃ(ɪ)ə ˈnaɪgrə|
[mod.L., = black substance.]
A curved layer of grey matter in the brain that extends from the pons to the subthalamic region on each side, separating the tegmentum of the midbrain from the crus cerebri, and forming part of the extra-pyramidal system.
1882Quain's Elements Anat. (ed. 9) II. 315 A section into the crus cerebri shows the two parts of which it is composed to be separated from one another by a tract of dark coloured grey substance known as the substantia nigra. 1923[see Parkinsonism]. 1961Lancet 26 Aug. 446/1 A tiny old hæmorrhage in one substantia nigra, and a small periaqueductal glial scar, were the only focal lesions found. 1976Smythies & Corbett Psychiatry iv. 41 The dopamine system is divided into several portions. The main one has its cell bodies in the substantia nigra. |