Charles R. Bardeen 385 
Fic. 3. Ventral view showing the relation of the pelvis to the boay wall 
and the main nerve trunks. At the right the outline of the peritoneal mem- 
brane is shown. The division of the main nerve trunks into branches is 
diagrammatic. 
PLATE IV. 
+ Medial and lateral views showing the relations of the nerves of the abdomi- 
nal wall and posterior limb to the abdominal musculature and the skeleton 
of embryo CXLIV, length 14 mm., age about five and one-half weeks. The 
skin of the thigh and leg is represented transparent. About 17 diam. 
Fie. 1. Medial view. 
Fic. 2. Lateral view. 
PLATE V. 
Medial and lateral views showing the relations of the nerves of the abdomi- 
nal wall and posterior limb to the abdominal musculature and the skeleton of 
embryo XXII, length 20 mm., age about seven weeks. The skin of the leg 
is represented transparent. About 13 diam. 
Fic. 1. Medial view. 
Fic. 2. Lateral view. 
PLATE VI. 
Figures showing the nerves of the abdomen and the nerves and muscles 
of the extensor side of the thigh. 
Fic. 1. Embryo CXLIV, length 14 mm., age about five and one-half weeks. 
The abdominal musculature has been partially removed to show the course 
of the main nerve trunks. About 17 diam. 
Fie. 2. Embryo XXII, length 20 mm., age about seven weeks. The ventral 
portion of the abdominal wall has been removed. About 13 diam. 
Fics. a@ and b. Branches of the femoral nerve to the quadriceps femoris 
muscle in embryo CXLIV and in embryo XXII. The muscle in each instance 
is represented semitransparent. About 15 diam. 
PLATE VII. 
Two diagrammatic outline sketches to illustrate the distribution of 
the cutaneous nerves of the inferior extremity in the adult. 
Fie. 1. Front view of the left and medial view of the right leg. The 
dotted line on the right leg represents approximately the proximal margin of 
the embryonic limb-bud. 
Fic. 2. Back of the left leg and lateral side of the right leg. The dotted 
line represents approximately the distal margin of the embryonic limb-bud. 
PuLatTe VIIL. 
Figures to illustrate the early differentiation of the adductor, hamstring, 
tensor fascie late, gluteal, obturator internus, and quadratus femoris muscles 
and the short head of the biceps and the nerves supplied to these. 25 diam. 
Fic. 1. Adductor and hamstring muscles in embryo CXLIV, length 14 mm., 
age about five and a half weeks. In order that the adductor longus and 
brevis may be seen, merely the outline of the gracilis muscle is shown. 
