Biomaterial Database

[Relation between the spontaneous activity and dynamic characteristics of primary afferents of the lateral semicircular canal in frogs]. 1981

I V Orlov

Spontaneous activity (SA) and responses of 68 primary afferents of frog lateral semicircular canal to sinusoidal vibration (frequency band: 0.04-200 Hz, double peak amplitude up to 10 microns) of canal wall were studied in immobilized frogs. The regularity of SA was evaluated by coefficient of variation (CV). 12 units (17.6%) constituted the regular group (CV less than 0.3), 9 units (13.2%)--the irregular group (CV approximately equals 1.0), and 47 units (69.1%)--the intermediate one (CV =0.4-0.9). The correlation between background activity and responses is most clear for the regular group whose dynamic characteristics are: responses only "all round" type; narrow (0.04-0.4 Hz) band of effective vibration frequencies; large (up to 9 sec) time constant to step stimulus. The two other groups are clearly different in their frequency possibilities. The wide range afferents (identified as intermediate) are able to respond to wide band of vibration (0.04-180 Hz) and have the largest gain among the three groups. Their dynamic range is also wide. For high frequency (irregular) units effective band is from 20-60 Hz (from below) up to 120-180 Hz (from above). They may be identified as real vibroreceptors. The other characteristics (CV, time constant to step stimulus, etc.) in the two last groups smoothly pass on from one group to another.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009475	Neurons, Afferent	Neurons which conduct NERVE IMPULSES to the CENTRAL NERVOUS SYSTEM.	Afferent Neurons,Afferent Neuron,Neuron, Afferent
D011896	Rana temporaria	A species of the family Ranidae occurring in a wide variety of habitats from within the Arctic Circle to South Africa, Australia, etc.	European Common Frog,Frog, Common European,Common European Frog,Common Frog, European,European Frog, Common,Frog, European Common
D011984	Sensory Receptor Cells	Specialized afferent neurons capable of transducing sensory stimuli into NERVE IMPULSES to be transmitted to the CENTRAL NERVOUS SYSTEM. Sometimes sensory receptors for external stimuli are called exteroceptors; for internal stimuli are called interoceptors and proprioceptors.	Nerve Endings, Sensory,Neurons, Sensory,Neuroreceptors,Receptors, Neural,Neural Receptors,Receptors, Sensory,Sensory Neurons,Sensory Receptors,Nerve Ending, Sensory,Neural Receptor,Neuron, Sensory,Neuroreceptor,Receptor Cell, Sensory,Receptor Cells, Sensory,Receptor, Neural,Receptor, Sensory,Sensory Nerve Ending,Sensory Nerve Endings,Sensory Neuron,Sensory Receptor,Sensory Receptor Cell
D004594	Electrophysiology	The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
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
D012665	Semicircular Canals	Three long canals (anterior, posterior, and lateral) of the bony labyrinth. They are set at right angles to each other and are situated posterosuperior to the vestibule of the bony labyrinth (VESTIBULAR LABYRINTH). The semicircular canals have five openings into the vestibule with one shared by the anterior and the posterior canals. Within the canals are the SEMICIRCULAR DUCTS.	Semi-Circular Canals,Canal, Semi-Circular,Canal, Semicircular,Semi Circular Canals,Semi-Circular Canal,Semicircular Canal
D014725	Vestibular Nerve	The vestibular part of the 8th cranial nerve (VESTIBULOCOCHLEAR NERVE). The vestibular nerve fibers arise from neurons of Scarpa's ganglion and project peripherally to vestibular hair cells and centrally to the VESTIBULAR NUCLEI of the BRAIN STEM. These fibers mediate the sense of balance and head position.	Scarpa's Ganglion,Ganglion, Scarpa's,Nerve, Vestibular,Nerves, Vestibular,Scarpa Ganglion,Scarpas Ganglion,Vestibular Nerves
D014732	Vibration	A continuing periodic change in displacement with respect to a fixed reference. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Vibrations