Term: yolk syncytial layer anatomical surface
Name: yolk syncytial layer
Synonyms: periblast, yolk sac, YSL
Definition: Peripheral layer of the yolk cell including nuclei and non-yolky cytoplasm.
Ontology: Anatomy Ontology [ZFA:0000088]

Name: anatomical surface
Synonyms: surface
Definition: A 2D surface of an anatomical continuant.
Ontology: Spatial Ontology [BSPO:0000005]