. The American journal of anatomy. enchyma whichis distinctly broader andmore conspicuous than any Fig 3 Embryo of mm. Harvard Embryological of the other Sagittal series 473. Section 334. X . , ,, ? diams. The paraphysis at this stao-e is much more developed and contains a large cavity communi-cating with that of the forebrain. Its wall is distinctly thicker than inthe younger embryo. Fig. 3 is not as fortu-nate a median sagittal sec-tion as the last. Theparaphysis is shown ex-ceedingly well, but thecommunication of the cav-ity of the epiphysis withthe forebrain does
. The American journal of anatomy. enchyma whichis distinctly broader andmore conspicuous than any Fig 3 Embryo of mm. Harvard Embryological of the other Sagittal series 473. Section 334. X . , ,, ? diams. The paraphysis at this stao-e is much more developed and contains a large cavity communi-cating with that of the forebrain. Its wall is distinctly thicker than inthe younger embryo. Fig. 3 is not as fortu-nate a median sagittal sec-tion as the last. Theparaphysis is shown ex-ceedingly well, but thecommunication of the cav-ity of the epiphysis withthe forebrain does not ap-pear in this section. It isfrom an embryo of 43mm., and is naturallymuch more developed thanthe previous one. Theposterior commissure isvery large. Portions of tho tiihiilos nf tlio Pninlw Embryo of 43 mm. Harvard Embryologicalme lUOUlCi- OI ine epipny- collection, sagittal series 50it. Section 363. X €is are seen in the mesen- <^**^^- <:hymal tissue above the roof of the third ventricle. The superior. Franklin Dexter 17 commissure has materially increased in size, and is found in its usualposition. Anterior to this commissure a fold in the roof of the ven-tricle might easily be taken for the epiphysial opening, but such is notthe case. The posterior velar arch has again changed its shape. Whatwas formerly described as the horizontal arm is now distinctly ascend-ing and forms with the perpendicular arm a fairly acute angle, with adirection of upwards and forwards. The perpendicular arm has notaltered its position, but the choroid plexus springing from it is thor-oughly well developed, lying in many folds, some of which have beencut transversely and therefore appear separated from the roof of theventricle. The velum transversum is very much changed in appear-ance. The mesenchymal tissue has thinned, its choroid fold is veryprominent, and but for its specific position it would Ije impossible todifferentiate it from any otherfold of the choroid plexus.(
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
