U L T R A S T R U C T U R E OF D E V E L O P I N G A M P H I B I A N E G G 149
FIG. 11. A low-power electron micrograph of a portion of a more mature oocyte
than that shown in Fig. 10. The cytoplasm contains numerous yolk platelets (y) of
varying size. The zona pellucida (zp), which lies adjacent to a portion of a follicle
cell nucleus (fen) is more developed. Beneath the zona pellucida, the cytoplasm
is essentially devoid of organelles. Adjacent to this layer is a broad stratum of mitochondria. These organelles are distributed at random throughout the yolk-containing
cytoplasm. X 5000.
FIG. 11. A low-power electron micrograph of a portion of a more mature oocyte
than that shown in Fig. 10. The cytoplasm contains numerous yolk platelets (y) of
varying size. The zona pellucida (zp), which lies adjacent to a portion of a follicle
cell nucleus (fen) is more developed. Beneath the zona pellucida, the cytoplasm
is essentially devoid of organelles. Adjacent to this layer is a broad stratum of mitochondria. These organelles are distributed at random throughout the yolk-containing
cytoplasm. X 5000.