A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . olk sac remains throughout thisstage the dominant feature of the embryo. 7he Embri/oixil Starje.—During the third week the em-bryo grows rapidly in size and attains a length of about. Fig. Lg., mm. Long. (Enlarged about 30 di-ameters.) am. Amnion : B, belly stalk ; C, cborion; /(.heart; I,yolk sac. (His.) 4 mm. The brain increases in size and shows the threeprimary divisions. The optic and otic vesicles becomeinoi-e prominent. Two more gill clefts a
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . olk sac remains throughout thisstage the dominant feature of the embryo. 7he Embri/oixil Starje.—During the third week the em-bryo grows rapidly in size and attains a length of about. Fig. Lg., mm. Long. (Enlarged about 30 di-ameters.) am. Amnion : B, belly stalk ; C, cborion; /(.heart; I,yolk sac. (His.) 4 mm. The brain increases in size and shows the threeprimary divisions. The optic and otic vesicles becomeinoi-e prominent. Two more gill clefts and three moregill arches appear caudal to the ones alrcad} altached area of the volk sac has diminished. The 453 Foetus. FOFtllS. REFERENCE HANDBOOK OF THE .AIEDICAL SCIENCES. mouth cavity communicates witli tlie pliarynx. By thefwenly-lirst day the liml) buds appear (see Fig. 5148).Internally the lieait is eularijctl and takes the form of anS-shaped tube. From the aorta now arise live pairs of Z n
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