Human embryo grades

Human embryo from IVF

Embryo manipulation equipment

Embryo biopsy lab

Human embryo for IVF

Mouse Blastocyst showing inner cell mass

Newly fertilised human egg

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Human egg soon after fertilisation viewed using
Nomarski optics. The two parental pronuclei are clearly
visible and have not yet fused.

Human eight cell embryo for IVF selection. This
embryo is considered to be grade one which is of
sufficient quality to be used for in vitro
fertilisation.

A blastocyst is a hollow ball of cells containing
the inner cell mass. This cluster of cells gives
rise to the foetus itself and contributes to the
extraembryonic membranes whilst the trophectoderm
gives rise to the placenta. The blastocyst breaks
out of the zona pellucida prior to implanting in
the uterine wall.

Diagram of blastocyst

Human eight cell embryo for IVF selection. This
embryo is considered to be of grade four, which is
not of sufficient quality for in vitro
fertilisation.

Human eight cell embryo for IVF selection. This
embryo is considered to be of grade three, which is
not of sufficient quality for in vitro
fertilisation.

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IN VITRO FERTILISATION

Images

Works

Newly fertilised human egg

Human embryo from IVF

Diagram of blastocyst

Human embryo for IVF

Human embryo for IVF

Today’s opening times

Wellcome uses cookies.

IN VITRO FERTILISATION

Images

Works

Newly fertilised human egg

Human embryo from IVF

Diagram of blastocyst

Human embryo for IVF

Human embryo for IVF

Wellcome Collection

Today’s opening times