THE DOMESTIC PIGEON 



371 



muscular walls. Beyond the gizzard the small intestine forms 

 a loop inclosing the pancreas, which discharges its secretion 

 into the intestine through three ducts, one of which is shown 



Tongue 



Posterior nostril 



Trachea 



Esophagus 



m$\~"'-Cere 



Medulla- 



Pulmonary artery 

 Left branch of pulmonary vein 

 Esophagus 

 -Left lung 



-Olfactory lobe 

 ■'%^-Glottis 



'.x-Optic nerve 

 S ""V" Cerebrum 

 ~^ji}~~Optic lobe 

 ^-Cerebellum 

 ™ -Cranium 



— Spinal cord 



First digit (thumb) 

 Second digit - - - -^3. 



Crop 



Right branch of aorta 

 Left branch of aorta 



Aorta 

 Left auricle -- 



Left ventricle — 

 Pericardium 



Liver- 

 Sternum 

 Spleen 

 Glandular stomach 



Gizzard — 

 Leg- 



Intestine 

 Pancreas 



Dorsal aorta 

 Spermary 



Sperm duct 

 Ureter 

 Kidney 

 Csecum 



Oil gland 

 Terminal vertebra 



Bile duct 

 Pancreatic duct 



Vesicula seminalis 

 Aperture of ureter into cloaca 



Fig. 195. Dissection of common pigeon. (Reduced) 



in Fig. 195. The liver is large and opens into the intestine 

 by two bile ducts. The posterior end of the intestine {rectum) 

 passes without change of diameter into the cloaca. The 

 junction between the rectum and cloaca is marked by the 



