Memorize Zoo

Just gotta know this shit

Amnion

Provides a fluid-filled environment;

Formed from the somatopleure (ecto + meso);

“Water broke”

Chorion

Provides protection (shock absorber);

In mammals becomes the placenta for nutrients and gas exchange.

Yolk Sac

Source of nutrition (true eggs) and a source of blood cells (mammals).

Formed from the Splanchnopleure (endo + meso)

Allantois

Stores nitrogenous waste (true eggs) and forms the umbilical cord (mammals)

Rhombomeres

Segmentally repeated units in vertebrate hindbrains;

Display alternating pattern of eph/ephrins that mediate cell-cell repulsion

Forebrain vesicle

Becomes the Telencephalon and the Diencephalon

Telencephalon

becomes olfactory lobes, hippocampus, and cerebrum

top most vesicle

Diencephalon

becomes the thalamus, hypothalamus, and retina.

second from the top

Midbrain

third vesicle from the top

Hindbrain

Becomes the metencephalon and myelencephalon. Forms the rhombomeres

Melencephalon

becomes the cerebellum and pons

fourth vesicle from the top

Myelencephalon

Becomes the medulla

Bottom most vesicle