Archive image from page 111 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 78 HUMAN EMBEYOLOGY. folded niediallj''; the tips of the fingers are free, and the palms rest on the cranial part of the distended abdomen. The thighs and the toes have appeared, and the tail has begun to fuse with the caudal end of the body (Fig. 104). At the end of the eighth week, when the embryo becomes a foetus, it has attained a length of about 25 mm. (CR). The auricles project from the sides of the head, the tail has almost disappeared from the
Archive image from page 111 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 78 HUMAN EMBEYOLOGY. folded niediallj''; the tips of the fingers are free, and the palms rest on the cranial part of the distended abdomen. The thighs and the toes have appeared, and the tail has begun to fuse with the caudal end of the body (Fig. 104). At the end of the eighth week, when the embryo becomes a foetus, it has attained a length of about 25 mm. (CR). The auricles project from the sides of the head, the tail has almost disappeared from the surface, and the toes are free from one another. The cervical flexure is now very slight, and although the head is still relatively large, the disproportion between it and the body has begun to decrease (Fig. 105). Third Month.—The head grows less rapidly, and, though it is still large, it is relatively smaller in proportion to the whole body. The eyelids close, and their margins fuse Fig. 104.—Embryo (CR) greatest length 18-5 mm. Probably between seven and eight weeks old. (From Keibel and Elze's Normaltafeln.) The abdomen is very prominent on account of the rapid increase of the liver. The digits of the hand and foot are distinct but not separated from one another. The margin auricle of the external ear is completed. The eyelids have begun to form. Fig. 105.—Hdman Fcetus eight and a half weeks old. (After His.) GE. Genital eminence ; UC. Umbilical cord. together. The neck increases in length. The various parts of the limbs assume their definite proportions, and nails appear on the fingers and toes. The proctodeum is formed and the external generative organs are differentiated, so that the sex can be distinguished on external examination. The skin is a rosy colour, thin and delicate, but more consistent than in the preceding stages. By the end of the third month the total length of the fcetus, excluding the legs, is 7 cm. (2| in.), including the legs, 9-10 cm. (3§-4
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