Embryology

Before we're even born, we make the long and torturous journey from a one-celled zygote to a mostly-formed fetus. But how do we get there? Learn about your trek through the realm of embryology!

THE BEGINNING OF THE EMBRYO

Morula (and precursors)
Trophectoderm
Syncytiotrophoblast
Cytotrophoblast
Inner Cell Mass
Hypoblast
Epiblast
Primordial Germ Cells

Endoderm

Foregut
Pharynx
Pharyngeal Pouches
Eustachian Tubes
Parathyroids
Tongue and Thyroid
Gut Tube
Respiratory System
Liver and Gallbladder
Pancreas
Midgut
Hindgut
Allantois
Bladder
Cloaca
Urogenital Sinus (Makes Bladder)
Rectum

Mesoderm

Axial Mesoderm
Paraxial Mesoderm
Somites
Dermomyotome
Myotome
Sclerotome
Head Paraxial Mesoderm
Intermediate Mesoderm
Urogenital Tract
Gonad
Kidney
Adrenal Cortex
Lateral Plate Mesoderm
Somatic Mesoderm
Splanchnic Mesoderm
Heart
Smooth Muscle
Vasculature
Blood Cells
Mesenteries
Spleen
Limbs

Ectoderm

Surface Ectoderm
Neural Ectoderm
Neural Plate/Tube
Spinal Cord
Brain
Prosencephalon
Mesencephalon
Rhombencephalon
Placodes
Optic Placode
Otic Placode
Anterior Pituitary
Neural Crest
Cranial Neural Crest
Cardiac Outflow Tract
Enteric Nervous System
Chromaffin Cells
Neurons/Glia of PNS
Melanocytes