PREGNANCY 



e-j 



besides affording freedom of movement to the embryo within. 

 The fluid is an exudation from the foetal and maternal blood, 

 and in the latter part of pregnancy contains urea. 



Mid-brain \^^^ 



y^^^^^ Hind brain 



Auditory vesicle 

 Visceral arches 



Amnion (cut) 



Body -stalk 

 Fig. 47. — Human embiyo, between eighteen and twenty-one days old. 

 (After His, from Graif& Anatomy.) 



Heart 



Hyoid arch 

 Mandibular arch 

 Maxillary process - 

 Eye ' 



Olfactory pit 



Chorion 



Fore limb 



Hind limb 



Fig. 48.~Human embryo, between twenty-seven and thirty days old. 

 (After His, from (J raj's Anatomy.) 



