Yolk sac

Yolk sac

The yolk sac in man contains no nutrients so in this aspect is vestigial. However, the its embryonic endodermal roof is the source of the mucous membrane of almost the entire intestinal tract. The yolk sac also is concerned with the transfer of nutritive fluid to the embryo from the trophoblast, primary mesenchyme and extra-embryonic coelem.

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Part of Speech: noun
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Industry/Domain: Anatomy
Category: Developmental anatomy
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Related terms

yolk sac

Natural environment; Coral reefs

A vascularized extra-embryonic membrane of amniote embryos that forms around the yolk of the egg cell in birds and reptiles. In mammals, the yolk sac membrane grows out around the ...

yolk sac

Anatomy; Developmental anatomy

The yolk sac in man contains no nutrients so in this aspect is vestigial. However, the its embryonic endodermal roof is the source of the mucous membrane of almost the entire ...

yolk sac

Science; General science

An extraembryonic membrane which extends through the umbilicus in vertebrates. In some elasmobranchs, birds, and reptiles, it is laden with yolk which serves as the nutritive ...

yolk sac

Meat products; Poultry

The follicle where an ovum and its surrounding yolk are held until the yolk matures and is released.

yolk sac

Medical; Health care; Medicine

The first of four extra-embryonic membranes to form during embryogenesis. In reptiles and birds, it arises from endoderm and mesoderm to incorporate the egg yolk into the ...

yolk-sac larva

Natural environment; Coral reefs

A fish larva which has already hatched from the egg but has not yet started feeding and still absorbs the yolk in the ventrally-attached yolk sac.

trophoblast

Anatomy; Developmental anatomy

A granular protoplasmic body; a plastid, formed from cytotrophoblast, eventually surrounds the entire embryo; insert themselves between uterine epithelial cells, then spread along ...

ventralward

Anatomy; Developmental anatomy

Toward a belly, venter, or ventral aspect.

vertex

Anatomy; Developmental anatomy

The top or crown of the head.

zona pellucida

Anatomy; Developmental anatomy

A thick, transparent, noncellular layer or envelope of uniform thickness surrounding an oocyte. Also called the oolemma.

segmentation cavity

Anatomy; Developmental anatomy

The fluid-filled cavity of the mass of cells produced by cleavage of a fertilized ovum.

somite

Anatomy; Developmental anatomy

One of the paired, block like masses of mesoderm, arranged segmentally alongside the neural tube of the embryo, forming the vertebral column and segmental musculature.