. An American text-book of obstetrics. For practitioners and students. Fore-brain - Olfactorylobe. Optic stalk:. Cephalic flexure. Mid-brain Hind-brain. After-brain. Cerebral portion ofpituita ry body. Pontineflexure. Fig. 119.—Diagram showing relations of brain-vesicles and flexures (Bonnet). even before closure, becomes expanded into three primary brain-vesicles, theanterior, the middle, and the posterior. The anterior and the posterior ofthese vesicles very soon subdivide into secondary compartments, the arrange-ment of the brain-segments then being, from before backward, the fore-brain,the
. An American text-book of obstetrics. For practitioners and students. Fore-brain - Olfactorylobe. Optic stalk:. Cephalic flexure. Mid-brain Hind-brain. After-brain. Cerebral portion ofpituita ry body. Pontineflexure. Fig. 119.—Diagram showing relations of brain-vesicles and flexures (Bonnet). even before closure, becomes expanded into three primary brain-vesicles, theanterior, the middle, and the posterior. The anterior and the posterior ofthese vesicles very soon subdivide into secondary compartments, the arrange-ment of the brain-segments then being, from before backward, the fore-brain,the inter-brain, the mid-brain, the hind-brain, and the after-brain (Fig. 118). Coincidently with these changes the cerebral axis has suffered marked de-flection (Fig. 119) from its original almost straight condition. By the fifteenthday the cranial flexure is strongly pronounced, a bend of almost 90° takingplace opposite the mid-brain (Fig. 120, a). During the fourth week furthermarked changes appear; the bend opposite the mid-brain, or mesencephalicflexure, has increased almost to 180°, so that the ventr
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
