Embryo Ectoderm

How high yield is Embryo??? Well I think most of it can be quickly memorized right before the exam but here are some of the key structures and where they originated from:

You must know the 3 basic types of origination:

Ectoderm, Mesoderm and Endoderm

Here is some ectoderm to think about!

In Ectoderm you have sub classes Surface Ectoderm, Neuroectoderm and Neural Crest

Surface Ectoderm:

Epidermis

Hair

Nails

Inner Ear, External Ear 

Enamel of teeth

Lens of eye

Anterior Pituitary (Rathke Pouch)

Parotid Gland

Neuroectoderm:

Neural tube

CNS

Retina and optic nerve

Pineal Gland

Neurohypophysis

Astrocytes 

Oligodendrocytes

Neural Crest:

Adrenal Medulla

Ganglia:

Sensory and Autonomic

Pigment Cells

Schwann Cells

Meninges

Pia and arachnoid mater

Pharyngeal Arch Cartilage

Odontoblasts

Parafollicular (C) cells

Aorticopulmonary Septum

Endocardial Cushions

They like to trick you up on the neural crest cells. SO they may ask you about a sick infant and give all the symptoms of Hirschprungs / megacolon and than ask you something like. "the cells involved in this disease come from the same origin of which of the following?" then they list a bunch of garbage. In the mean time your still trying to figure out what is wrong with the kid! Well he is missing cells that run his enteric nervous system of his gut. Those cells have a neural crest origin like all ganglia. So in the answer choices you want to find something that also originates from neural crest cells, like dental pulp = odontoblasts.