Image from page 227 of "On the anatomy of vertebrates [electronic resource]" (1866)
Authors: Owen, Richard, 1804-1892
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library
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maticus; f marks the in-sertion of a muscle, e pyrami-dalis of Hippotomy, whicharises by a slender tendon fromthe maxillary, and gliding be-neath the labial part of b, ex-pands to be inserted, fleshy, intothe outer border of the nostriland contiguous skin-folds. The Horse is remarkable forthe size of the rhinencephalonand the extent of the cribriformplate transmitting its nerves tothe nose: they pass upon aseries of about ten short longitudinal folds directed forward and alittle downward, forming the e ethmoidal labyrinth of Hippotomy,the upper larger division being the e ethmoturbinal; a longer,larger, more simply disposed plate, attached to both prefrontalsand nasals, and chiefly descending from the latter bones, formsthe c nasoturbinal: beneath this is the c maxilloturbinal, ofabout the same vertical extent, and almost the same length. Thebony septum contributed by the coalesced prefrontals, forms,superiorly, about one-fourth of the general partition : the vomer 1 XCI1I. pp. 20-26.
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Muscles of nostrils and upper lip, Horse. ORGAN OF SMELL IN MAMMALIA. 213 extends, beneath it, along about three-fourths of the lower thirdof the septum, but subsides to a point; the major part of theseptum is gristly. In the Hippopotamus the nostrils are relatively small, promi-nent, wide apart, and are served by muscles which open andclose them like the eyelids, besides protruding and retractingthem. The accessory sinuses of the nasal chamber are verylittle developed. Their extent and size offer a great contrast inthe Hog-tribe, in which the essential parts of the olfactory organare also relatively larger and more complex. The rhinencepha-lon is large, with many nerves, and the cribriform plate of greatextent: the 6 labyrinthic part of the capsule attached to itsunder or outer surface forms nine or ten longitudinal, slightlydiverging folds, fig. 153, q, the three or four uppermost of whichcoalesce to form the ethmoturbinal, which is long, slender,subconvolute, and attenuated to a fi
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