. Birds: the elements of ornithology ; with 174 illustrations whereof 140 are original drawings. Birds; Birds. THE INTEBIS'AL SKELETON. 183 foramen, called the foramen ovale, is pierced in the alisphenoid. It transmits the third branch of the fifth pair of nerves. Beneath the sphenoid behind its rostrum is the opening of a passage called the eustachian tuhe or ca7ial—which bifurcates as it passes backwards to the bony cavity of each ear; but the two tubes may open separately on the under surface of the skull. Further back on either side is the opening of another canal, which transmits an impor
. Birds: the elements of ornithology ; with 174 illustrations whereof 140 are original drawings. Birds; Birds. THE INTEBIS'AL SKELETON. 183 foramen, called the foramen ovale, is pierced in the alisphenoid. It transmits the third branch of the fifth pair of nerves. Beneath the sphenoid behind its rostrum is the opening of a passage called the eustachian tuhe or ca7ial—which bifurcates as it passes backwards to the bony cavity of each ear; but the two tubes may open separately on the under surface of the skull. Further back on either side is the opening of another canal, which transmits an important blood-vessel called the carotid * artery. These parts are bounded below by the bony plates Fig. Side View op Fowl's Skull. a, Surangular bone of mandible ; ar, articular bone; d, dentary ; f, frontal ; /, jugal; I, lachrymal; we, median ethmoid; onx, maxillary bone; ji;, parietal; pf, post-frontal process ; pt, pterygoid bone ; i^x, premaxilla ; q, quadrate bone; qj, quadrato-jugal; sq, squamosal; v, vomer. called " ; The nerve which moves the tongue, the ninth or " hypoglossal nerve," passes out through the basi- occipital, and the nerve called " vagus " makes its exit from the skull more externally and a little anteriorly to the former. A little more anterior still, is that hinder opening of a canal for the carotid artery just mentioned. Part of the interorbital septum and more or less of the median partition between the nostrils may remain gristly or cartilaginous. In the very young condition the skull is entirely formed of membrane and cartilage, and when the bones begin to form they are numerous and distinct, but they mostly soon * See below, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mivart, St. George Jackson, 1827-1900. London :
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectbirds
