| 单词 | tectum |
| 释义 | tectum Anat.|ˈtɛktəm|
[L., = roof.]
a. More fully tectum mesencephali. The roof of the midbrain, lying dorsal to the cerebral aqueduct.
1907J. B. Johnston Nervous Syst. Vertebrates xvi. 255 It must be remembered always that the tectum opticum is only a part of the tectum mesencephali. 1921Tilney & Riley Form & Functions Central Nervous Syst. xxviii. 487 Like other suprasegmental parts of the nervous system, the tectum is capable of great expansion to meet the demands of adaptation. 1979Sci. Amer. Sept. 82/1 The mesencephalon..in mammals includes two pairs of structures that together form a region of four hills known as the lamina quadrigemina, the tectum mesencephali or simply the tectum.
b. More fully optic tectum (or tectum opticum). That part of the tectum mesencephali concerned with the functioning of the visual system.
1907J. B. Johnston Nervous Syst. Vertebrates viii. 147 Structure of the tectum opticum.—In the lower fishes the tectum contains a large number of cells of several forms. 1926Jrnl. Compar. Neurol. XL. 217 The optic tectum far surpasses the cortical areas of the reptilian hemispheres. 1982Sci. Amer. Mar. 104/3 The optic tectum, also known in mammals as the superior colliculus, is one of the major visual centers of the brain.
Hence ˈtectal a., of or pertaining to the tectum mesencephali or the optic tectum.
1926Jrnl. Compar. Neurol. XL. 217 A group of nuclei which serve as way-stations between the tectal areas and other centers. 1974Sci. Amer. Mar. 38/2 Recording from individual tectal neurons..tells one how the individual retinal ganglion cells that excite them are reacting. 1975Nature 30 Oct. 738/1 In the vertebrates below mammals, the tectal and subtectal areas are the main centres of termination of sensory pathways. |
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