Abstract
IT has been shown that the hypothalamus is connected with the posterior lobe of the hypophysis by means of a large unmyelinated fiber tract that runs by way of the infundibular stem. The components of this tract play an important r61e in regulating the secretory activity of the neural hypophysis (Fisher, Ingram and Ranson, 1938). A few fibers diverge from this tract or from the neural hypophysis and terminate within the anterior lobe of the pituitary (Croll, 1928; Brooks, 1938; Brooks and Gersh, 1937–38; and Rasmussen, 1938), but the number of fibers that do so is so small that it is doubtful whether they play a significant r61e in innervating the parenchyma of the anterior lobe. With the exception of these few fibers, no connection between the hypothalamus and the anterior lobe of the hypophysis has been demonstrated anatomically.
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