Abstract
The conduction of nerve impulses within the pineal system of the frog has been investigated. Uninterrupted transmission of nerve impulses was seen after electrical stimulation of the intracranial pineal tract and recording of action potentials from the extracranial portion of the pineal nerve. The conduction velocities were at 2–9 m/sec (medullated fibres of 3–8 μ diameter), 1–2 m/sec (intermediate group, 1–3 μ) and 0.2–0.9 m/sec (unmyelinated fibres, 0.2–0.8 μ). The highest speed of conduction was observed in R. catesbyana where the slowest fibres were conducting at velocities of the same range as the fastest nerve fibres in some specimens of R. temporaria and R. esculenta. It was concluded that the conduction of afferent impulses from the frontal organ to the posterior commissure of the midbrain is based mainly on unmedullated fibres.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Pflugers Archiv fur die gesamte Physiologie des Menschen und der Tiere
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
