4_Chicken Embryo

• at 4hrs, the blastodisc differentiates into

  area pellucida, area opaca
• region of the future caudal end of the embryo at 4hrs

  thickened area pellucida
• at what end does the primitive streak start forming at 4hrs

  caudal
• at how many hrs does the thickening of the blastoderm start to form the primitive streak

  7 - 8
• found at 4hrs of incubation that is the thickening of the cells at the caudal end

  koller’s sickle
• the chick at 16hrs is known as the

  primitive streak stage
• most distinct structure observed at 16hrs

  definitive primitive streak
• central furrow seen at 16hrs

  primitive groove
• primitive groove is lined by

  thickened primitive ridges
• closely packed cells that formed a thickened end at the head end seen at 16hrs

  hensen’s node
• thickening of part of the area pellucida adjacent to the primitive streak

  embryonic area/shield
• shape of area pellucida at 16hrs

  elliptical
• elongated primitive streak at 16hrs represents the _ of the future embryonic body

  long axis
• 16hr embryo is known as (stage)

  late gastrulation
• morphogenetic movement of cells in 16hr embryo marks the formation of

  notochord
• germ layer formed between neural plat, neural tube, neural groove

  ectoderm
• mesoderm at 16hrs extends on either side of _ & _

  ectoderm, endoderm
• protein that induces the mobilization of epiblast cells to the primitive groove to replace the hypoblast

  FGF8
• embryo of the chick at 18hrs is known as the

  head process stage
• 18hr chick is known as (stage)

  early neurulation
• this structure signals the start of neurulation

  neural plate
• small and more translucent portion of area pellucida found at the anterior end at 18hrs

  proamnion
• areas clearl visible at 18hr embryo

  dark peripheral area opaca, inner translucent area pellucida, central embryonal area
• at 18hrs, the primitive streak lies in the posterior half of the

  middle of area pellucida
• what germ layer does the notochord originate from

  ectoderm
• separated by hensen’s node at 18hrs

  neural plate, primitive streak
• at 18hrs, the structure is seen to extend from hensen’s node to the cephalic region

  notochord
• germ layer not present in 18hr embryo

  mesoderm
• germ layer that will fold to form the yolk sac

  endoderm
• when is gastrulation complete in the chick embryo

  18 hrs
• when does the early neurula stage of the developing embryo start

  18 hour up to 24 hour
• when does the late neurula stage of the developing embryo start

  33 hour
• parts that develop during the early neurula stage

  gut, heart
• appears during early neurula stage

  head process
• regresses during early neurula stage

  proamnion
• region that extends anteriorly and overhangs proamnion region at 24hrs

  cephalic
• at 24hrs, the cephalic region is termed as

  head of embryo
• space between head and blastoderm formed during 24hrs of incubation

  sub - cephalic pocket
• clearly visible during 24hr chick

  notochord, neural plate, neural folds, foregut, mesenchyme, pericardial coelom
• neural groove at the cephalic end of the growing chick at 24hrs

  deeper