MEDIAN SAGITTAL DISSECTIONS 



the fourth ventricle, which is now spread out laterally and flattened dorso-ven- 

 trally. About the notochord mesenchymal anlages which form the centra of the 

 vertebra are prominent. 



Turning to the alimentary tract, observe that the primitive mouth cavity 



Epiphysis Thalamus 

 Mesencephalon 



Tela chorioidea 



Lat. chorioid plexus 



Corpus slriatum 



Hypophysis 

 Lobus olfactorius 

 Turbinate anlage 



Palate 



Pedunc. cerebri 

 Cerebellum 

 Chorioidal plexus ventricle 4 



Tela of ventricle 4 

 Myelencephalon 



Epiglottis 



Esophagus 

 Spinal cord 

 Trachea 



Aorta 

 R. atrium 

 R. bronchus 

 Dorsal aorta 

 Inf. vena cava 

 Stomach 



Pancreas 

 Suprarenal gland 

 Genital gland 

 Duodenum 



Pulmonary artery 



Ventricle 



Diaphragm 



Liver 



Cacum 



Gall bladder 

 Small intestine 



Urethra 



Metanephros 



Colon 

 L. mesonephric duct 



Ureter 

 Urogenital sinus with mesonephric duct Rectum 



FIG. 142. Median sagittal dissection of a 35 mm. embryo. 



is now divided by the palatine folds into the upper nasal passages and lower 

 oral cavity. In the lateral walls of the nasal passages develop the anlages of the 

 turbinate bones. On the floor of the mouth and pharynx, the tongue and epiglottis 

 become more prominent. The trachea and esophagus elongate and the lungs lie 



