CORONA RADIATA ZONA PELLUCIDA PERIVETELLINE SPACE CELL MEMBRANE NUCLEUS HEAD MIDPIECE FLAGELLUM PROTECTIVE COATING NUCLEUS Capacitation The protective coating of PROTEINS and GLYCOPROTEINS ID: 777477
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Slide1
Fertilisation
By Zoe Rees
Slide2CORONA RADIATA
ZONA PELLUCIDA
PERIVETELLINE SPACE
CELL MEMBRANE
NUCLEUS
HEAD
MID-PIECE
FLAGELLUM
PROTECTIVE COATING
NUCLEUS
Slide3Capacitation
The protective coating of
PROTEINS
and
GLYCOPROTEINS
is removed. This involves
ENZYMES
found in the uterus.
Slide4The sperm is travelling towards the egg, surrounded by the
CORONA RADIATA
, a membrane.
Slide5The sperm contracts the
CORONA RADIATA
which ruptures releasing
PROTEASE ENZYMES
The enzymes
DIGEST
the ZONA PELLUCIDA surrounding the oocyte.
Slide6The sperm travels through the
CORONA RADIATA
and
ZONA PELLUCIDA
and into the
PERIVETELLINE SPACE.
INVERSION
of the
ACROSOME results in the formation of a NEEDLE-LIKE FILAMENT.
Slide7The needle filament
PIERCES
the softened oocyte membrane, known as a
ACROSOME REACTION.
Allowing the head to penetrate.
The entry of the head stimulates
THICKENING of the ZONA PELLUCIDA
which prevents the entry of other sperm known as POLYSPERMY.
Slide8The entry of the head stimulates the completion of the
SECOND MEIOTIC DIVISION
of the
OOCYTE NUCLEUS.
The nuclei of the oocyte and the sperm
FUSE
together to form a
DIPLOID CELL (ZYGOTE)
Slide9