An Afferent System in the Central Tegmental Fasciculus

Abstract

SUMMARY The brainstem course of the limb afferent component of the central tegmental fasciculus has been determined in both the cat and the phalanger, Trichosurus vulpecula, using evoked potentials. Unit records obtained from the reticular formation indicate that the ascending central tegmental fasciculus arises in large part from the level of the superior olives. The termination of the system is found mainly in n. parafascicularis of the posterior thalamus. Attention is drawn to the correspondence between the ascending central tegmental fasciculus and the reticular activating system (arousal system) of the medial brainstem.

The Reticulo—hypothalamic Pathway Controlling the Release of Oxytocin in the Ewe

“…This means that, in the spinal cord, the lateral and ventral fibres of the mammopituitary connexion are not in the direct spinothalamic tracts [neo-and paleospinothalamic tracts according to the terminology of Mehler (1957) and Mehler, Feferman & Nauta (I960)] but belong to the spino-reticular fibres described by Rao, Breazile & Kitchell (1969) in the sheep, in other species by Bechterew (1885), and more recently by Brodai (1949), Morin, Schwartz «fe O'Leary (1951), Mehler, Feferman & Nauta (1956), Rossi & Brodai (1957), Nauta & Kuypers (1958), Dennis & Kerr (1961), Bowsher (1962) and Lund & Webster (1967). These fibres reach the pituitary stalk by passing through the subthalamus.…”