Embryo

Embryo

1. Ectoderm

   • Neural Plate
     • Neural Tube
   • Neural Crest
     • PNS Cells
   • Eye Muscles

2. Mesoderm

   • Notocord
   • Lateral -2
     • Somatic Mesoderm
       • Sternum + Appendicular Skeleton
         • Bone, Cartilage, CT
       • +Ectoderm = Somatopleure
         • Intra
           • Lateral + Ventral Bodywalls
             • Limb Field
             • Limb Buds
         • Extra
           • Amnion
           • Chorion
     • Splanchnic Mesoderm
       • +Ectoderm = Splanchnopleure
         • Extra
           • Yolk Sac
           • Allantois
         • Intra
           • Gut
       • Sm. Muscle + Cardiac Muscle
       • Liver CT Capsule + Ligaments
   • Paraxial/Somites
     • Sclerotome
       • Vertebral Column + Ribs
     • Dermatome
       • Connective Tissue + Dermis
     • Myotome
       • Epimere
         • Dorsal Muscles
       • Hypomere
         • Thoracic + Abdominal Muscles

3. Endoderm

   • Primitive Gut/ Archenteron
     • Caudal Hindgut
       • HindGut
         • Caudal Intestinal Portal => Cloacal Membrane
         • Rectum
         • Colon
         • Urorectal Septum
           • Grows caudally to seperate the cloaca
           • Ventral Urogenital Sinus
             • Bladder
           • Dorsal Rectum
       • Proctodeum
         • Cloacal Membrane => External Opening Cloacal Membrane Later Ruptures to form anus
         • Anal Canal
         • Anus
       • Cloacal membrane
     • MidGut
       • Vitelline Duct/ Yolk Stalk  => Yolk sac Later Reduced to Vitello-Intestinal Duct
       • Ileum
       • Jejunum
       • Caud. Duodenum
       • Cecum
       • Cran. Colon
     • Cranial Foregut
       • Stomodeum (Buccopharyngeal Membrane)
         • Later Ruptures to form Continuity of mouth
       • Pharynx
       • Esophagus
       • Stomach
       • Cr. Duodenum
       • Hepatic Bud/ Diverticulum
         • Pars Hepatica
           • Liver Parenchyma/ Cords
           • Hepatic Ducts
         • Pars Cystica
           • Cystic Duct
             • Absent in Horses
             • Bile Duct
               • Major Duodenal Papilla
           • Gall Bladder
       • 2 Pancreatic Buds
         • Dorsal Pancreatic Bud
           • Dorsal mesentary
             • Left Lobe of Pancreas
           • Accessory Pancreatic Duct
         • Ventral Pancreatic Bud
           • Right Lobe of Pancreas

4. Also Mesoderm

   • Dorsal Mesogastrium
     • Spleen
       • Gastro-Splenic Ligament formed by portion of Mesoderm
     • Lesser Omentum
   • Ventral Mesograstrium
     • Greater Omentum
   • Allantois***
     • Urachus
       • Degenerates slowly
   • Septum Transversum
     • Liver: Kupffer Cells + CT