. The development of the chick; an introduction to embryology . y\ %.. \ III I. O 3 S r^^ £ £ y, c3 >> 3 03 Sh fl 1-, _ _ W o^ « r o II sn i^ s ^ _^ O n^ o 1) i c . rrl ^ fi t; *^ ^ 0; O t-i n C3 •-; o ^ O :: ^ ^ i>. O -r --Si a ^ m >>G 0) M —^ . ^ -0-; oj :s s ^ rw _: > .So 03 .t; o HEAD-FOLD TO TWELVE SOMITES 101 the ectoderm are destined to form the neural crest, a structureof great significance, inasmuch as the series of cranial and spinalganglia is derived from it. (See following chapter.)

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