^aVILLARV PROCESS 



OTIC VESICLE 3HO PHAnVNGEAL ABCH 



PERICAROIAL 

 SWELLING 



HIND LIM8 



K». 



1TK PHAHVJOEAL 

 ARCH 



t^'iPER^CAROlAL 

 HiDGfC 



■ roHE LIMO 



Figure 31.7. Upper, Side view of a human embryo about four weeks old; its crown- 

 rump length is 5 mm. Lower, A human fetus about eight weeks old; its crown-rump 

 length is 30 mm. (From Hamilton, Boyd and Mossman: Human Embryology, Williams 

 and Wilkins Co.) 



646 



