. An American text-book of obstetrics. For practitioners and students. y elongated, and its proximal end cleft into diverging tubes at theformation of a septum. These limbs of the recess open into different spaces,one entering into the saccule, the other into the utricle. The permanent arrangement is now established whereby communicationbetween the divisions of the membranous vestibule, the utricle and the sac-cule, is effected only by the indirect passage through the limbs of the ductusendolymphaticus. The primary otic vesicle thus becomes the complicatedmembranous labyrinth, and the ectoderm
. An American text-book of obstetrics. For practitioners and students. y elongated, and its proximal end cleft into diverging tubes at theformation of a septum. These limbs of the recess open into different spaces,one entering into the saccule, the other into the utricle. The permanent arrangement is now established whereby communicationbetween the divisions of the membranous vestibule, the utricle and the sac-cule, is effected only by the indirect passage through the limbs of the ductusendolymphaticus. The primary otic vesicle thus becomes the complicatedmembranous labyrinth, and the ectodermic epithelial lining undergoes differ-entiation in the formation of the highly specialized structures, as the organ ofCorti and the maculse acusticse, for the perception of transmitted stimuli. The mesoderm immediately surrounding the membranous labyrinth laterundergoes important changes, whereby the tissue next the epithelial structuresis converted into the connective tissue enveloping and supporting the delicate 134 AMERICAN TEXT-BOOK OF OBSTETRICS. DESC Fig. of fetal circulation before birth ; the arrows indicate the course of the blood-current ; the colors show the character of the blood carried by the different vessels. PHYSIOLOGY OF PREGNANCY. 135
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
