The arrest of cell migration in the chicken blastoderm: experimental evidence for the involvement of a band of extracellular fibrils associated with the basal lamina

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Figure

Fig. 1. Schematicrepresentationof a stage-5blastoderm,to show thedispositionof the differentgermlayersin a sagittalsection(S8! andin transversesections(a-dL The Arabic numerals indicatethe differentregionsof rhe deeplayer.1,volk endoderm; 2, endophyl!; 3,

Fig 1.

Schematicrepresentationof a stage 5blastoderm to show thedispositionof the differentgermlayersin a sagittalsection S8 andin transversesections a dL The Arabic numerals indicatethe differentregionsof rhe deeplayer 1 volk endoderm 2 endophyl 3 . View in document p.2
Fig. 2. Mediosagittalsectionof a stage-5chickenblastodermat the level of the endophylliccrescentand at the edgeof the area opaca(AOJIarea pellucida (AP), The insetsindicatethe areas chosenfor ultrathinsectiomng_DL

Fig 2.

Mediosagittalsectionof a stage 5chickenblastodermat the level of the endophylliccrescentand at the edgeof the area opaca AOJIarea pellucida AP The insetsindicatethe areas chosenfor ultrathinsectiomng DL. View in document p.3
Fig. 8. High magnificationof a basallamina-associatedfibril (asterisk)of 0.3 pm x 0.7 pm in size.The basal/amlna,clearlyresolvedinto a laminalucida(LL) and a laminadensa(LD),is closelyapposedto the plasmamembrane.Magnification:x94000.

Fig 8.

High magnificationof a basallamina associatedfibril asterisk of 0 3 pm x 0 7 pm in size The basal amlna clearlyresolvedinto a laminalucida LL and a laminadensa LD is closelyapposedto the plasmamembrane Magnification x94000 . View in document p.5
Fig. 9. SEM photomicrographat low magnificationof the ventralside of a stage-6blastodermafter removalof its deeplayer.The asterisksindicate the location of a horseshoe-shapedfibrillarbandInside this band, the basal lamina is smooth,and only rnterstitlal bo

Fig 9.

SEM photomicrographat low magnificationof the ventralside of a stage 6blastodermafter removalof its deeplayer The asterisksindicate the location of a horseshoe shapedfibrillarbandInside this band the basal lamina is smooth and only rnterstitlal bo. View in document p.6
Fig. 15. Schematicrepresentationusedblastoderm.of theexperimentalprocedurefor transplantationof a pieceof primitivestreakinto a hostThe graft was transplantedso that the apical surface of itsupper layer faces the basal side of the host upper layer

Fig 15.

Schematicrepresentationusedblastoderm of theexperimentalprocedurefor transplantationof a pieceof primitivestreakinto a hostThe graft was transplantedso that the apical surface of itsupper layer faces the basal side of the host upper layer. View in document p.8

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