Biomaterial Database

Retention of the original topographic polarity by the 180 degrees rotated tectal reimplant in young adult goldfish. 1973

M G Yoon

1. The pattern of visual projection from the retina on to the optic tectum was studied with neurophysiological mapping methods following reimplantation of the optic tectum in young adult goldfish.2. When a rectangular piece of the tectum was dissected out and then reimplanted to the same tectum in situ, the restored visual projection showed a normal retinotopic order over the area of the tectal reimplant.3. If the tectal tissue was reimplanted after rotation by 180 degrees , the visual projection from that part of the retina which innervated the 180 degrees rotated tectal reimplant was found to be organized in a completely reverse retinotopic order within the reimplanted area in contrast to the normal projection from the other part of the retina on to the intact surrounding area of the same optic tectum.4. The results indicate that a piece of reimplanted tectal tissue retains its original topographic polarity regardless of whether the tectal tissue was rotated or not.5. The retention of original topographic polarity by a small fraction of the tectal tissue suggests that the optic tectum is not a passive receiver of incoming optic fibres but an active accommodator which selects appropriate optic fibres to make proper synaptic connexions in a consistent topographic order.

UI	MeSH Term	Description	Entries
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
D003530	Cyprinidae	A family of freshwater fish comprising the minnows or CARPS.	Barbels,Chub,Dace,Minnows,Roach (Fish),Shiner,Tench,Tinca,Barbus,Rutilus rutilus,Tinca tinca,Chubs,Shiners,Tinca tincas,tinca, Tinca
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
D013238	Stereotaxic Techniques	Techniques used mostly during brain surgery which use a system of three-dimensional coordinates to locate the site to be operated on.	Stereotactic Techniques,Stereotaxic Technics,Stereotactic Technique,Stereotaxic Technic,Stereotaxic Technique,Technic, Stereotaxic,Technics, Stereotaxic,Technique, Stereotactic,Technique, Stereotaxic,Techniques, Stereotactic,Techniques, Stereotaxic
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
D014182	Transplantation, Autologous	Transplantation of an individual's own tissue from one site to another site.	Autografting,Autologous Transplantation,Autotransplantation,Autograftings,Autologous Transplantations,Autotransplantations,Transplantations, Autologous
D014794	Visual Fields	The total area or space visible in a person's peripheral vision with the eye looking straightforward.	Field, Visual,Fields, Visual,Visual Field
D014795	Visual Pathways	Set of cell bodies and nerve fibers conducting impulses from the eyes to the cerebral cortex. It includes the RETINA; OPTIC NERVE; optic tract; and geniculocalcarine tract.	Pathway, Visual,Pathways, Visual,Visual Pathway