The American journal of anatomy . prm ^^mgui^^ prm Fig. 4. A Fig. 4. B Fig. 4. A. punctatum, two parasagittal sections to show the relations of thehead mesoderm. Hteinalum. shifting back of the preoral entoderm and by the general compressionwhich >nn obliterates the anterior end of the archenteric cavity. 2. Development of ectoderm which will form the hypophysis can lie recognize]as soon as the neural plate is formed (Figs. 1, 2, 3). Below the 48 J. B. Johnston. terminal ridge of the neural plate (see Johnston, 1909) the ectodermgrows thinner. The wedge-shaped piece of ectode
The American journal of anatomy . prm ^^mgui^^ prm Fig. 4. A Fig. 4. B Fig. 4. A. punctatum, two parasagittal sections to show the relations of thehead mesoderm. Hteinalum. shifting back of the preoral entoderm and by the general compressionwhich >nn obliterates the anterior end of the archenteric cavity. 2. Development of ectoderm which will form the hypophysis can lie recognize]as soon as the neural plate is formed (Figs. 1, 2, 3). Below the 48 J. B. Johnston. terminal ridge of the neural plate (see Johnston, 1909) the ectodermgrows thinner. The wedge-shaped piece of ectoderm immediatelyadjacent to the neural plate will form the hypophysis. Its positionis accurately indicated in Figs. 1 and 2. When the preoral entodermis more blunt or rounded the hypophysis presents in the earlieststages a triangular form in sagittal sections (Fig. 3), one anglebeing directed inward between the terminal ridge of the neural plateand the preoral entoderm. When the neural plate rolls up theterminal ridge parti
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1910
