Biomaterial Database

[Morphofunctional organization of the mesencephalic visual center of the midbrain tectum of steppe and swamp turtle]. 1976

V P Boiko, and N V Goncharova

Neuronal receptive fields (RF) and dendritic arborizations (DA) in the midbrain tectum of the tortoise A. horsfieldi have been investigated and the results obtained were compared to those reported earlier for the tortoise E. orbicularis. It was shown that in A. horsfieldi, neurons with small RF (less than 10 degrees) are 3.2 times less numerous, whereas those with large RF (more than 30 degrees) are 1.6 times more numerous than in E. orbicularis. Ellipsoidal RF are predominant in A. horsfieldi, elongated ones -- in E. orbicularis. A. horsfieldi neurons more frequently react to large objects (36%), than to small ones (3%), whereas in E. orbicularis the ratio of these neurons is inverse (13 and 23% respectively). Neurons of A. horsfieldi are less effective in differentiation of the form of the object, the direction of its movement and changes in illumination. In highly specialized neurons of the species compared, the size of RF may correspond to the size of DA. The differences observed are presumably associated with differences in the ecology of the animals investigated.

UI	MeSH Term	Description	Entries
D009039	Motion Perception	The real or apparent movement of objects through the visual field.	Movement Perception,Perception, Motion,Perception, Movement
D001931	Brain Mapping	Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.	Brain Electrical Activity Mapping,Functional Cerebral Localization,Topographic Brain Mapping,Brain Mapping, Topographic,Functional Cerebral Localizations,Mapping, Brain,Mapping, Topographic Brain
D003336	Tectum Mesencephali	The dorsal portion or roof of the midbrain which is composed of two pairs of bumps, the INFERIOR COLLICULI and the SUPERIOR COLLICULI. These four colliculi are also called the quadrigeminal bodies (TECTUM MESENCEPHALI). They are centers for sensorimotor integration.	Corpora Quadrigemina,Lamina Quadrigemina,Quadrigeminal Plate,Tectal Plate,Commissure of Inferior Colliculus,Commissure of Superior Colliculus,Colliculus Commissure, Inferior,Colliculus Commissure, Superior,Inferior Colliculus Commissure,Inferior Colliculus Commissures,Mesencephalus, Tectum,Plate, Quadrigeminal,Plate, Tectal,Quadrigeminal Plates,Superior Colliculus Commissure,Superior Colliculus Commissures,Tectal Plates,Tectum Mesencephalus
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013045	Species Specificity	The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.	Species Specificities,Specificities, Species,Specificity, Species
D014426	Turtles	Any reptile including tortoises, fresh water, and marine species of the order Testudines with a body encased in a bony or cartilaginous shell consisting of a top (carapace) and a bottom (plastron) derived from the ribs.	Sea Turtles,Terrapins,Tortoises,Sea Turtle,Terrapin,Tortoise,Turtle,Turtle, Sea,Turtles, Sea
D014796	Visual Perception	The selecting and organizing of visual stimuli based on the individual's past experience.	Visual Processing,Perception, Visual,Processing, Visual