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dc.contributor.authorDickie, John Kolbe Milneen
dc.date.accessioned2018-09-13T16:09:04Z
dc.date.available2018-09-13T16:09:04Z
dc.date.issued1912
dc.identifier.urihttp://hdl.handle.net/1842/32920
dc.description.abstracten
dc.description.abstractIn this paper the writer proposes to give an account of the development of the nose, mouth, and pharynx. The methods of research employed in this piece of work have been mainly the use of wax plate reconstructions, while some embryos have been examined by the microscope alone. However, as the number of human embryos available was very limited, one has had to fall back on the literature for descriptions of some of the stages. It has been found necessary for the sake of clearness to repeat some of the facts occasionally.en
dc.description.abstract(1) The tongue is developed from three roots, vi+ tuberculum impar, lateral tongue rudiments and copulei The tuberculum impar is itself mainly derive4 from the first pair of arches, and ultimately forms triangular area on the dorsum of the tongue in front of the foramen caecum. The lateral tongue rudiments grow up from the anterior edges of the first arches and enclose the tip of the tuberculum impar betweén them. The tip and sides of the tongue are formed by the lateral tongue rudiments. The copula is a swell - ong caused by the union of the second arches in the middle line. It along with the parts of the second arches immediately lateral to it form the tongue root, i.e, the portion between the foramen caecum and the epiglottis.en
dc.description.abstractIn this way the whole of the tongue in front of the foramen caecum is derived from the first arch, while behind the foramen caecum it is derived from the second arch.en
dc.description.abstract(2) The epiglottis is developed from the third arches and the arytenoid tubercles from the fourth and fifth arches.en
dc.description.abstract('3) The palatal processes, from which most of the permanent palate develops, are derived partly from the maxillary processes but also to a large extent directly from the mandibular arch.en
dc.description.abstract(4) The middle ear and. Eustachian tube are level oiled from the dorsal extensions of the first. and second visceral pouches. Thus elements of the first, second and third arches enter into the composition of its walls.en
dc.description.abstract(5) The faucial tonsil is developed from the remains of the second and appears a considerable time before the pharyngeal tonsil.en
dc.description.abstract(6) Median diverticula in the posterior pharyngeal wall near the mouth of the oesophagus are a common occurrence in the pig and may also occur in the human embryo. Their position is pretty constant in the pig, viz. between the third. and fourth visceral pouches. They are situated in a position in which malignant disease is very liable to occur and where the so called. "pressure pouches" are not uncommon. These facts are sufficient to suggest that there may be an embryological element in the - causation of the pharyngo-oesophageal diverticula met with occasionally in the adult.en
dc.publisherThe University of Edinburghen
dc.relation.ispartofAnnexe Thesis Digitisation Project 2018 Block 20en
dc.relation.isreferencedbyen
dc.titleStudies on the development of the upper air passagesen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnameMD Doctor of Medicineen


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