During this period, the embryo is a

During this period, the embryo is a bilaterally organized, with a
well
-
developed notochord
and a newly completed set of
somites that extend to the end of a long post
-
anal tail. Body
axis gets straightened from its early curvature about the yolk
sac, circulation, pigmentation, and fins begin their
development. The nervous system is hollow. The h
ead
straightens out and lifts to the dorsal side. The brain is
prominently sculptured. The blood flow is visible. Pigment
formation begins in cells of the pigmented retinal epithelium.
The embryo continues to exhibit spontaneous side
-
to
-
side
contractions i
nvolving the trunk and tail and the rate of
contractions increases in bursts till the embryo hatches out of
the chorion (Fig.34
-
35). The embryo gets elongated and
gradually differentiated into head and tail, and the body
becomes into C
-
shaped. The yolk get
s attached between tail
and head. Myotomes development was observed. The embryo
started occasional movement. As the twitching stage; the tail
was completely detached from the yolk. The yolk sac was
restricted to head region. The number of myotomes increase
d.
The embryo became active and showed continuous twitching
movement.

Hasil (Bahasa Indonesia) 1:

Selama periode ini, embrio yang terorganisir secara bilateral, denganbaik-maju Notokordadan satu set baru selesaisomites yang memperluas ke akhir posting yang panjang-anal ekor. TubuhAXIS akan meluruskan dari kelengkungan yang awal tentang kuning telurkantung, sirkulasi, pigmentasi, dan sirip mulai merekapengembangan. Sistem saraf merupakan berongga. Hbenar menyebalkanLuruskan keluar dan mengangkat ke sisi dorsal. Otakmencolok pahatan. Aliran darah ini terlihat. Pigmenpembentukan dimulai di sel-sel epitel pigmen retina.Embrio terus menunjukkan sisi spontan-untuk-sisikontraksi sayanvolving batang dan ekor, dan tingkatpeningkatan kontraksi semburan hingga menetas embrio darichorion (Fig.34-35). embrio mendapat memanjang dansecara bertahap dibedakan menjadi kepala dan ekor, dan tubuhmenjadi ke C-berbentuk. Mendapatkan kuning telurs terpasang antara ekordan kepala. Pembangunan myotomes diamati. Embriomemulai gerakan sesekali. Sebagai tahap twitching; ekorini benar-benar terpisah dari kuning telur. Kantung kuning adalahterbatas pada daerah kepala. Sejumlah peningkatan myotomesd.Embrio menjadi aktif dan menunjukkan terus-menerus bergerak-gerakgerakan.