SPLANCHNOLOGY 165 



floating portion of the small intestine. Occupying the left lower 

 quadrant is the sectioned surface of the gizzard and on the abdominal 

 floor and to the right of the gizzard, the posterior end of the right 

 lobe of the liver. 



THE RELATIONS OF THE VISCERAL ORGANS OF THE BABY CHICK 



There is approximately 47 per cent, of the yolk retained in the 

 abdominal yolk sac of the baby chick at hatching. Figure 47 



FIG. 47. An antero-posterior section through the body of a baby chick just 

 hatched, i, Abdominal yolk sac. 2, Gizzard. 3, Liver. 4, Heart. 5, In- 

 testines. 6, Spinal cord. 7, Cerebrum. 8, Cerebellum. 9, Fat in the post- 

 occipital region. 10, The thymus gland. 



shows a photograph of a longitudinal section through a baby chick. 

 This figure shows all the posterior portion of the abdominal cavity 

 occupied with abdominal yolk. The abdominal viscera are pushed 

 forward, and as the yolk is gradually absorbed the visceral organs 

 gradually occupy their normal position. 



A section through this body Fig. 47 at A is shown in Fig. 

 48, A. At this point the esophagus appears below the vertebral 

 column. Figure 48, B, a section through the body at Fig. 47, B, 

 shows the apex of the lungs. In a median line and below the lungs 

 is the esophagus. Note the mucous membrane thrown into folds. 

 Here the heart is sectioned, showing both auricles and both ventri- 



