Biomaterial Database

Lateral spread of light-induced response at the cell body and axon terminal levels of external horizontal cells in the carp retina. 1983

T Teranishi

One type of light-induced response (photopic L-type S-potential)recorded from isolated carp (Cyprinus carpio) retinas was identified by its spectral response and later confirmed by morphological localization of the recorded sites ionophoretically marked by a fluorescent dye, Lucifer yellow. Such L-type S-potentials could be recorded from the soma and from the axon terminal of external horizontal cells. The spatial property of the S-potentials from the soma was compared with that recorded from the axon terminal by enlarging the diameter of a light spot (0.25 to 4.0 mm) and by displacing the spot (0.5 mm dia.) along a straight 4-mm line which passed over the recording point at the middle. The half-decay distance of decremental amplitude with spot displacement was significantly (P less than 0.001) shorter in recordings from the soma than from the axon terminal, indicating that the spatial summation is less in the soma than in the axon terminal. The spatial summation was found to be for the two parts of the cell. Therefore, the soma and axon terminal appear to function as a single unit with respect to spectral information, but as two separate units with respect to spatial information. Electrical and dye couplings are assumed to take place at two different (cell body and axon terminal) levels, possible being separated by the high resistance of the slender axon in the carp retina.

UI	MeSH Term	Description	Entries
D008027	Light	That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.	Light, Visible,Photoradiation,Radiation, Visible,Visible Radiation,Photoradiations,Radiations, Visible,Visible Light,Visible Radiations
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
D002347	Carps	Common name for a number of different species of fish in the family Cyprinidae. This includes, among others, the common carp, crucian carp, grass carp, and silver carp.	Carassius carassius,Crucian Carp,Cyprinus,Grass Carp,Carp,Ctenopharyngodon idellus,Cyprinus carpio,Hypophthalmichthys molitrix,Koi Carp,Silver Carp,Carp, Crucian,Carp, Grass,Carp, Koi,Carp, Silver,Carps, Crucian,Carps, Grass,Carps, Silver,Crucian Carps,Grass Carps,Silver Carps
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
D001369	Axons	Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.	Axon