Archive image from page 150 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 FROM TWELVE TO THIRTY-SIX SOMITES 131 chapter. The lateral limiting sulci are a continuation of the lateral limbs of the head-fold; they owe their origin to the folding of the splanchnopleure and somatopleure adjacent to the embryo towards the yolk, at the line of junction of embryonic and extra- embryonic parts. The tail-fold arises about the stage of 26 to 27 somites (Fig. 93), and is similar to the head-fold, except that it is turned

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Archive image from page 150 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 FROM TWELVE TO THIRTY-SIX SOMITES 131 chapter. The lateral limiting sulci are a continuation of the lateral limbs of the head-fold; they owe their origin to the folding of the splanchnopleure and somatopleure adjacent to the embryo towards the yolk, at the line of junction of embryonic and extra- embryonic parts. The tail-fold arises about the stage of 26 to 27 somites (Fig. 93), and is similar to the head-fold, except that it is turned in the opposite direction. The sulci combine to form a continuous ring around the embryo and gradually pinch it off, so to speak, from the extra-embryonic blastoderm. In the splanchnopleure the lateral limiting sulci (Fig. 69) \CJ}or. 'iSpsiSi PX - yoM.

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