. Cunningham's Text-book of anatomy. Anatomy. PAETS DEEIVED FEOM THE DIENCEPHALON. 609 The optic nerve is chiefly formed by the passage of fibres backwards from the retina in the wall of the original optic stalk, whilst the chiasma takes form by the transit of fibres across the median plane in front of the infundibulum ....^--^ --- â^^^^^^s a and behind the optic recess. ^ llllLjL^ To a large extent these fibres «^/ cerebr^ are derived from the optic Sjm JP*"' **\ nerve. The optic recess of «5/ Met- the third ventricle marks the Jlv spot where the hollow optic vesicle was originally att
. Cunningham's Text-book of anatomy. Anatomy. PAETS DEEIVED FEOM THE DIENCEPHALON. 609 The optic nerve is chiefly formed by the passage of fibres backwards from the retina in the wall of the original optic stalk, whilst the chiasma takes form by the transit of fibres across the median plane in front of the infundibulum ....^--^ --- â^^^^^^s a and behind the optic recess. ^ llllLjL^ To a large extent these fibres «^/ cerebr^ are derived from the optic Sjm JP*"' **\ nerve. The optic recess of «5/ Met- the third ventricle marks the Jlv spot where the hollow optic vesicle was originally attached to the inferior and lateral part of the fore-brain, and in \ ^J" the adult it therefore repre- MS^'l; PR? sents a portion of the primitive cavity of the tubular stalk of T-^JtejflL f|P^ the optic vesicle. In the A ">ovv*s^Opt. course of development the optic nerve fibres, which ap- pear in the stalk of the optic c. " ROOF ^^ vesicle to form the optic nerve, i «/^^P â â â BBlfeCv^ seek an attachment much *^*f "Mb?/*- further back, and through the ,,' \ Ps- ment of nervous elements, %,. ^%mimit / although its posterior part A/y-Uo'^Kj^ becomes invaded by nervous B L vC jpa^Tc tissue to form the pineal body roVâr Reconstruction of the fore-brain and mid-brain of His's embryo KO ; epithelial, and remains so dur- pr°file vieJ- B' .?ame brain ast A' divided alon° the median Plane ..* . ' T . and viewed upon its inner aspect. mg life. It constitutes the m, Mamillary eminence ; Tc, Tuber cinereum ; Hp, Hypophysis epithelial roof of the third (hypophyseal diverticulum from buccal cavity) ; Opt, Optic stalk ; ventricle and it becomes in- ^H, Thalamus ; Tg, Tegmental part of mesencephalon ; Ps, Pars volutedalongthe median plane hypothalamic ; Cs, Corpus striatum ; FM, Foramen interventricu- - ⢠&. r lare ; L, Lamina termmalis ; RO, Recessus opticus ; Ei, Eecessus into the cavity to form the infundibuli. chorioid plexuses of the ven- tr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
