Quain's elements of anatomy . auditory vesicle issituated opposite the dorsal end of the hyoidean arch. The original Fig. 756.—Section through the Fig. 75G. HEAD OF A LEPIDOSTEUS EM-BRYO OF AX EjUILY period. (From Balfour.) , auditory vesicle ; ,auditory nerve ; di, the notochord,immediately below tlie medulla ob-longata ; liy, hypoblast. The nerv-ous layer of the epiblast is seen tobe distinct from the cuticular layerwhich is not involuted. aperture, ?which is directed hackwards, is soon closed ex- tcrnallj, but in the interior a vestige of it remains for a considerable time as the re
Quain's elements of anatomy . auditory vesicle issituated opposite the dorsal end of the hyoidean arch. The original Fig. 756.—Section through the Fig. 75G. HEAD OF A LEPIDOSTEUS EM-BRYO OF AX EjUILY period. (From Balfour.) , auditory vesicle ; ,auditory nerve ; di, the notochord,immediately below tlie medulla ob-longata ; liy, hypoblast. The nerv-ous layer of the epiblast is seen tobe distinct from the cuticular layerwhich is not involuted. aperture, ?which is directed hackwards, is soon closed ex- tcrnallj, but in the interior a vestige of it remains for a considerable time as the recessus Jahyrinthiy. which coiTesponds to the aqueduct of the vestibule of later life. The primary otic vesicle, sinking down towards the basis of thecranium, becomes imbedded in the formative mesoblastic tissue lyingbetween the basi-occipital and alisphenoid matrices, and along with themundergoes chondrification and ossification at an early period, as has beenalready described under the development of the head. Fig.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
