Exercise 20 (Continued) 



Step 5. — Open the oviduct lengthwise and study the internal structure 

 of the various sections. Note especially the funnel shaped end or infundibu- 

 lum, the isthmus where the shell membranes are added and the uterus where 

 the shell is added. 



Leading Questions. — 1. How many ovules are there in the average hen's 

 ovary? 



2. Describe the difference in appearance of ovules in a mature and im- 

 mature hen. 



3. Describe the difference in appearance of an oviduct in mature and 

 immature hens. 



4. What peculiar appearance did you find on the inside wall of the shell- 

 secreting section of the oviduct? 



5. What was the length of the oviduct in a hen when in lajdng condition? 

 When in a non-laying condition? 



6. What correlation is there, if any, to the number of ovules and the 

 rapidity and number of eggs laid by a hen? 



7. How do the yolks or ovules enter the oviduct? 



8. In what part of the oviduct does fertilization take place? 



9. How many times does the oviduct bend on itself? 



10. Name the successive steps in the formation of a complete egg. 



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