. Handbook of field and general ornithology; a manual of the structure and classification of birds . tongue. 1, 2, 3 are the cor-responding viscercd clefts, between the arches ; the first of these is tobe modelled into the ear-passages (outer and middle ear andEustachian tube); the others will disappear. The quadrate cartilage,q, is the same that was seen in Fig. 64 ; it is already nearly inposition, between the hind ends of the scaffolding of the upper andunder jaw. The curved suhocidar or maxillopalatine bar, r)ixp, de-veloped in the first postoral arch, already indicates anteriorlypalatine,
. Handbook of field and general ornithology; a manual of the structure and classification of birds . tongue. 1, 2, 3 are the cor-responding viscercd clefts, between the arches ; the first of these is tobe modelled into the ear-passages (outer and middle ear andEustachian tube); the others will disappear. The quadrate cartilage,q, is the same that was seen in Fig. 64 ; it is already nearly inposition, between the hind ends of the scaffolding of the upper andunder jaw. The curved suhocidar or maxillopalatine bar, r)ixp, de-veloped in the first postoral arch, already indicates anteriorlypalatine, pia, and posteriorly, pterygoid, pg, parts; it will form the ANA TOMY OF BIRDS 225 bones so named, and others of the upper jaw. This subocular baris an antero-superior part of the first post-oral arch, of which 2 andmk are a postero-inferior portion; the cleft of the future mouth isto lie between them. The lower jaw-bone, or mandible, is entirelydeveloped from mk, its several bones developing around this rod ofcartilage, which is called the Meckelian cartilage; it is to become ; i. -^A t^J-^. Fig. 64.—Skull of chick, fifth clay of incu-bation, X 9 diameters. Seen from above,the membranous roof of the skull and thebrain removed, cul, anterior cerebral vesicle ;e, eye ; c, notochord, running through themiddle of the basilar plate or parachordalcartilage, in which are already visible therudimentary ear-parts, cl, the cochlea, )isc,the horizontal semicircular canal; jrfs, thepituitary space, bounded by ti\ the trabe-culse, which come together before it to formthe frontonasal plate, fa in Fig. 65 ; Ig, lin-gula or bridge, connecting trabecule withparachordal cartilage ; 5, notch afterwardsbecoming foramen ovale for passage of partsof the fifth (trifacial) nerve ; 9, foramen forhypoglossal nerve; q, separate cartilageforming the future quadrate bone. (AfterParker, in Ency. Brit.) libii L,^. Fig. 65.—Same as Fig. 64, but seen from , anterior cerebral vesicl
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Keywords: ., bookauthorcouesell, bookcentury1800, bookdecade1890, bookyear1890
