Williams, W. Gordon2019-10-222019-10-221969196915872565b14315208https://hdl.handle.net/2144/38363PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (M.Sc.D.)--Boston University. School of Graduate Dentistry, 1969.Bibliography, colored photographs, drawings included.In order to describe the microcirculation of the tongue of the dog a study was conducted using 12 animals ranging in weight from 12 to 18 kg. The dogs were anesthesized with an I.V. injection of Nembutal (O.5 ml/kg of body weight at a concentration of 4.0 mg/ml of solution). After surgical exposure of the external carotids, these arteries were bilaterally cannulated with polyethylene tubes containing 3-way stop-cocks that permitted the control of the rate of infusion and the flow of blood through the artificial bypass. After infusion of the animals with either Pelikan ink (Gunther-Wagner) or Microfil (Bio-Medical Products) under the influence of the intra-arterial pressure, the animals were sacrificed with an overdose of Numbutal. Both H & E and cleared sections were prepared for histologic study. The tongue was found to contain an extensive microvasculature. Main vessels ran anterio-posteriorly, laterally and dorso-ventrally. There was an elaborate dorsal subpapillary plexus of vessels. There were extensive dorsal and ventral subepithelial plexi. The dorsal and ventral plexi received their blood from the dorso-ventral vessels. Each of the five types of lingual papillae was richly vascularized. The structure of the papillary microcirculation varied with the structure of the papilla. Interpapillary connecting vessels joined the papillae of the same category with one another, and also joined the different types of papillae. Circulation in the intrinsic musculature was found to follow the direction of the muscle bundles, while sending numerous tiny vessels to the individual muscle fibres. Accessory salivary glands, adipose tissue, and large nerves and blood vessels were found to be extremely vascular.en-USThis work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.TongueDogThesis/Dissertation