i3» 
MAMMALIAN ANATOMY 
of an abundance of secretion (milk) in the gland. Note also the 
enlarged condition of the nipples in which the gland orifices are 
located. 
C. DEVELOPMENTAL STAGES. 
By means of the dissecting microscope, study a series of stages 
of mammalian embryos (mouse, rat, cat, or pig) and follow out the 
development of trunk, head, limbs, and viscera (exposed by 
previous dissection). Draw three stages each magnified five 
diameters. 
D. DEMONSTRATION PREPARATIONS OF HUMAN (OR 
OTHER PRIMATE) MATERIAL. 
1. Reproductive system with gravid uterus laid open to show 
the discoidal placenta, the amnion (closely adherent to the chorion), 
and the long twisted umbilical cord extending from the placenta 
to the embryo. Draw. 
2. Chorion of early human embryo before the development of 
the placenta, showing chorionic villi. Draw. 
3. Various stages of human embryos showing changes of form 
and proportions during development. (Cf. other mammalian 
embryos, and various atlases of human and mammalian embry¬ 
ology.) Identify any extraembryonal parts which may be 
attached to these specimens. Draw any which illustrate points 
not already recorded. 
