738 



THE ANATOMY OF THE RUFFED GROUSE 



~ ;j(f,t-_ Trachea 

 *r-Z a. 



I. Mouth 



2a. Esophagus 



■1 b 



2b. Crop 



*-a c 



2c. Esophagus 



3. Proventriculus 



4. Gizzard 



5. Liver 



6. Duodenal loop 



7. Spleen 



8. Pancreas 



9. Small intestine 



10. Caeca 



I I. Caecal junction with 



large intestine (rectum) 



12. Large intestine (rectum) 



13. Cloaca 



14. Vent 



ir.V/i.im ;/. I.nii 



- FIGURE !>(). DIGESTIVE SYSTEM 



The latter is divided into an anterior glandular portion (proventriculus) and a posterior 

 grinding jjorlion (gizzard), with a narrow i.-^tlinuis separating tbein. Gallinaceous birds lielon^ 

 to the tyjie in which the jiroventriculus is separated from the gizzard by a section which is 

 non-glandular internally""'. These birds have the ventriculus highly s])eeialized, for feeding 

 on vegetal material, by the great developincnl of llic niDsciilar |)(>rtiiiii and the tough thick 

 inner lining. 



The duodenum extends fidiii the (((■r>;d and anterior |)ail of the gizzard and then forms a 

 longitudinal loop. The pancreas lies between the arms of this loop. The entrance of the 

 |)ancreatic duels marks the beginning of the small intestine. This passes immediately dorsad 



