. Manual of antenatal pathology and hygiene : the foetus. r fcetal,but a transition lietween orcombination of the two — theorganism is putting off itsdistinctively embryonic andputting on its fcetal characters,is becoming human, i.e. re-cognisably similar to child oradult. The transition formis seen in His enibryo x.xxiv.(Dr.), the estimated age of which was thirty-eight days, and the lengthof which from neck-bend to coccygeal bend was lo cm. (Fig. 9). Transition organism, we may call it, yet it is probably morecorrect to regard organisms of all ages lietween six weeks and twomonths as transit
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. Manual of antenatal pathology and hygiene : the foetus. r fcetal, but a transition lietween orcombination of the two — theorganism is putting off itsdistinctively embryonic andputting on its fcetal characters, is becoming human, i.e. re-cognisably similar to child oradult. The transition formis seen in His enibryo x.xxiv.(Dr.), the estimated age of which was thirty-eight days, and the lengthof which from neck-bend to coccygeal bend was lo cm. (Fig. 9). Transition organism, we may call it, yet it is probably morecorrect to regard organisms of all ages lietween six weeks and twomonths as transition forms, the transition itself being not sudden, but gradual, recpiiring two weeks at least. For, during the seventhand eighth weeks (neofcetal period), several changes take place in theappearance of the organism; and some of these can lie recognised bycomparing the His embryo (Fig. 9) with a fcetus (Fig. 10) in mycollection, measuring 25 cms. in length (cephalo-coccygeal length), and of an estimated age of fifty-six days (end of neofu>tal period).. Fig. 9. Fin. 10. Anatomy and Physiology of Neofcetal Period. The changes which occur in the neofcetal period are external andinternal; they are less marked than those which have occurred inthe emltryo, Init they are much more marked than those tliat are tooccur in the fa?tus. With regard, in the first plarc, to crtenial appearances, the followingmay be emphasised a.s noteworthy. The greater part of the head of the i NEOFCETAL PKUIOD 81 six weeks embryo is sharply flexed at right angles to the back part of thehead and neck, so that the eye lies in front of the ear and below its level.The point where the back part of the head is continuous with the trunk ismarked by a concavit, called the Nackengruhe. In the fcetus eight weeksold, elevation of the greater part of the head has taken place, so that nowthe mid-brain lies above instead of anterior to the hind brain, the eye liesin front of the ear, but more nearly at the same level,