. Quain's elements of anatomy . ie brain. The auditoiy vesicle issituated opposite the dorsal end of the hyoidean arch. The original Fig. 756.—Section through the Fig. 756. HEAD OF A LEPIDOSTEUS EM-BRYO OF AN EARLY PERIOD. (From Balfour.) , auditory vesicle ; ,auditory nerve ; cJi, the notochord,immediately below the medulla ob-longata ; /(//, hypoblast. Tlie nerv-ous layer of the epiblast is seen tobe distinct from the cuticular layer■which is not involuted. aperture, vrhich is directedbackwards, is soon closed ex-ternally, but in the interiora vestige of it remains for a considerable
. Quain's elements of anatomy . ie brain. The auditoiy vesicle issituated opposite the dorsal end of the hyoidean arch. The original Fig. 756.—Section through the Fig. 756. HEAD OF A LEPIDOSTEUS EM-BRYO OF AN EARLY PERIOD. (From Balfour.) , auditory vesicle ; ,auditory nerve ; cJi, the notochord,immediately below the medulla ob-longata ; /(//, hypoblast. Tlie nerv-ous layer of the epiblast is seen tobe distinct from the cuticular layer■which is not involuted. aperture, vrhich is directedbackwards, is soon closed ex-ternally, but in the interiora vestige of it remains for a considerable time as the recessus lalyrinthiywhich corresponds 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 Fig. 757.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
