410 OUTLINES OF CHORDATE DEVELOPMENT 



month (see below), and at its close the embryo acquires a- 

 distinctly "human" aspect and is generally known as a "foetus" 

 in distinction from the earlier "embryo." 



FIG. 170. Outlines of human embryos of 106 to 110 days (118 to 120 mm.). 

 From Minot (Laboratory Text-book of Embryology). The figure to the left 

 shows the most frequent position of the embryo in utero; that to the right shows 

 the position assumed when removed from the embryonic membranes. 



The external form changes now become relatively slower. The 

 outlines of the head become more rounded; the facial characters 

 are more fully established; the eyelids close together. The 

 abdominal region recedes, the limbs become slender, elongated, 

 and flexed. The foetus is in a position of constraint within the 

 uterus, as shown in Fig. 170 from Minot. 



