Biomaterial Database

Comparative study on the teleostean optic tectum. Lamination and cytoarchitecture. 1979

R Kishida

Seventy-five species of teleosts were studied by a modified Bodian and the Golgi-Cox method to clarify certain relationship between habits and laminar formation in the optic tectum. The optic tectum of all species studied was divided into four layers (SM, 20 + SFGS, SGC + SAC and SPV) depending upon fiber connections with other areas, and the relative thickness of each layer was measured. All animals were classified into 8 groups (thick SM, thin SM, thick SO + SFGS, thin SO + SFGS, thick SGC + SAC, thick SPV, thin SPV and standard) based on relative thickness of each layer. The thick SM group has the large torus longitudinalis. The SO + SFGS group comprises diurnal, especially visually active fishes. As relative thickness of surface layers (SM and SO + SFGS) increases, the absolute value of whole layers becomes large. Aniamls with large relative thickness of the deepest layer (SPV) show the thin optic tectum. Seven types of cells, (a) pyramidal cell, (b) fusiform cell, (c) periventricular cell, (d) pyriform cell, (e) large multipolar cell, (f) horizontal cell and (g) small multipolar cell, were classified in Golgi-Cox preparations, and the extent of dendritic arborization was compared among the groups in relation to the thickness of each layer. Dendritis of pyramidal, fusiform and preiventricular neurons show varoius extents of arborization in proportion to thickness of layers where branch out. Other types of neuron do not conspicously vary in different groups. Animals belonging to the thick SPV group show poor dendritic arborization in all types of cells. These results were discussed from the ecological standpoint.

UI	MeSH Term	Description	Entries
D009412	Nerve Fibers	Slender processes of NEURONS, including the AXONS and their glial envelopes (MYELIN SHEATH). Nerve fibers conduct nerve impulses to and from the CENTRAL NERVOUS SYSTEM.	Cerebellar Mossy Fibers,Mossy Fibers, Cerebellar,Cerebellar Mossy Fiber,Mossy Fiber, Cerebellar,Nerve Fiber
D009474	Neurons	The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.	Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D012160	Retina	The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.	Ora Serrata
D003712	Dendrites	Extensions of the nerve cell body. They are short and branched and receive stimuli from other NEURONS.	Dendrite
D004292	Dominance, Cerebral	Dominance of one cerebral hemisphere over the other in cerebral functions.	Cerebral Dominance,Hemispheric Specialization,Dominances, Cerebral,Specialization, Hemispheric
D005399	Fishes	A group of cold-blooded, aquatic vertebrates having gills, fins, a cartilaginous or bony endoskeleton, and elongated bodies covered with scales.
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
D013477	Superior Colliculi	The anterior pair of the quadrigeminal bodies which coordinate the general behavioral orienting responses to visual stimuli, such as whole-body turning, and reaching.	Colliculus, Superior,Optic Lobe, Human,Optic Lobe, Mammalian,Optic Tectum,Anterior Colliculus,Superior Colliculus,Tectum, Optic,Colliculi, Superior,Colliculus, Anterior,Human Optic Lobe,Human Optic Lobes,Mammalian Optic Lobe,Mammalian Optic Lobes,Optic Lobes, Human,Optic Lobes, Mammalian,Optic Tectums,Tectums, Optic
D013687	Telencephalon	The anterior subdivision of the embryonic PROSENCEPHALON or the corresponding part of the adult prosencephalon that includes the cerebrum and associated structures.	Endbrain,Endbrains