Tne Testis and Its Relation to Reprod-uction 



A. Introduction 



1. General description of the male reproductive system 



2. Importance of the testis 



B. Anatomical features of the male reproductive system. 



1. Anatomical location of the testis 



2. Possible factors involved in testis descent 



3. General structure of the scrotum and the testis in mammals 



a. Structure of the scrotum 



b. General structure of the testis 



4. Specific structures of the mammalian testis which produce the reproductive cells 

 and the male sex hormone 



a. Seminiferous tubules 



b. Interstitial tissue 



5. The testis of vertebrates in general 



6. Accessory reproductive structures of the male 



a. The reproductive duct in forms utilizing external fertilization 



b. The reproductive duct in species practicing internal fertilization 



C. Specific activities of the various parts of the male reproductive system 



1. Introduction 



a. Three general functions of the male reproductive system 



b. Some definitions 



2. Activities of the testis 



a. Seasonal and non-seasonal types of testicular activity 



b. Testicular tissue concerned with male sex-hormone production 



c. Testicular control of body structure and function by the male sex hormone 



1 ) Sources of the male sex hormone 



2) Biological effects of the male sex hormone 



a) Effects upon the accessory reproductive structures 



b) Effects upon secondary sex characteristics and behavior of the individual 



c) Effects upon the seminiferous tubules 



d. Seminiferous-tubule activity and formation of sperm 



e. The seminiferous tubule as a sperm-storing structure 



3. Role of the reproductive duct in sperm formation 



a. Vertebrates without a highly tortuous epididymal portion of the reproductive 

 duct 



b. The epididymis as a sperm-ripening structure 



c. The epididymis and vas deferens as sperm-storage organs 



d. Two types of vertebrate testes relative to sperm formation 



