. The development of the chick; an introduction to embryology . ^t^. ■MyC. Fig. 58. — Ventral view of the head region of an emliryo of 5 somites, drawn in balsam with transmitted light. X .30. a. c. v., Amnio-cardiac vesicle. a. i. Anterior intestinal portal. F. (»., Fore-gut. Myc, Myocardium. Nch., Notochord. n. l\. Neural fold. s 2, s 4, Second and fovuih sonutes. 104 THE DEVELOPMENT OF THE CHICK. ~pr. str. Fig. 59. — Einliryo of 7 s from aliovo drawnill l)alsam with traiismittcd li,iz:ht. x c. Anterior ccrcliral suture, , Ceplialie Mesohlast. F. G.,
. The development of the chick; an introduction to embryology . ^t^. ■MyC. Fig. 58. — Ventral view of the head region of an emliryo of 5 somites, drawn in balsam with transmitted light. X .30. a. c. v., Amnio-cardiac vesicle. a. i. Anterior intestinal portal. F. (»., Fore-gut. Myc, Myocardium. Nch., Notochord. n. l\. Neural fold. s 2, s 4, Second and fovuih sonutes. 104 THE DEVELOPMENT OF THE CHICK. ~pr. str. Fig. 59. — Einliryo of 7 s from aliovo drawnill l)alsam with traiismittcd li,iz:ht. x c. Anterior ccrcliral suture, , Ceplialie Mesohlast. F. G., , Nolochord. n. T., Neiu-al tube. , Ojjtic vesicle. Pra., Proanmion. , Primitive streak, s 2, s 7, Second andseventh somites. V. o. m., Omphalo-mes-(nteric vein. HEAD-FOLD TO TWELVE SOMITES 105 parts, sutura neurochordalis sen ventralis and sutura terminalisanterior.) The neiiropore question resolves itself into this: What partof the sutura cerebralis anterior is to be called neuropore? Asthe suture extends from near the infundibulum to the pinealregion at least, there is a wide range of choice. However, thereis a point in the suture near its dorsal end where the separationof the ectoderm from the neural tube takes place later thanelsewhere. This may be regarded as the equivalent of theneuropore. The suture is the site of formation of the lami?iaterminalis (Chap. VIII).
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