| Term: | torus semicircularis nucleolus |
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| Note: | This page represents a term created by the combination ("post-composition") of two ontology terms. For more information on the individual terms, click the hyperlinked name. |
| Name: | torus semicircularis |
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| Synonyms: | semicircular torus |
| Definition: | Multi-tissue structure that is part of the midbrain and develops from the alar plate. The torus semicircularis is located dorsal to the lateral tegmentum where it extends into the medial tectal ventricle and receives ascending sensory octavolateralis input. |
| Ontology: | Anatomy Ontology [ZFA:0000599] |
| Name: | nucleolus |
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| Synonyms: | |
| Definition: | A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome. |
| Ontology: | GO: Cellular Component [GO:0005730] QuickGO AmiGO |