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Male accessory ducts include vasa efferentia, epididymis. vas deferens and rete testis. THey transport and temporarily store spermatozoa. Male accessory glands include seminal vesicle, bulbourethral gland and prostate gland. These glands secrete fluids that lubricate the female reproductive system and sperms.  
The major components of seminal plasma are mucous, fructose, calcium, ascorbic acid, certain enzymes and some secretions of accessory glands.  
Labelled diagram of human sperm is as follows:  
Spermiogenesis- The spermatids are transformed into spermatozoa by the process called spermiogenesis. Spermiation- The release of sperms from the seminiferous tubules occurs through a process called spermiation. 
  Spermatogenesis initiated due to an increase in the secretion of gonadotropin-releasing hormone by the hypothalamus. Increase in GnRH act on anterior pituitary and stimulate secretion of two gonadotropins, LH (luteinizing hormone) and FSH (follicular stimulating hormone). Among these, LH acts on Leydig cells and stimulates them to secrete androgens whereas FSH acts on Sertoli cells and...
Spermatogenesis- It is the process of formation of spermatozoa from spermatogonia in testes at the time of puberty is called spermatogenesis. In this process, the spermatogonia present at the inner side of seminiferous tubules multiply by mitotic division and increase in number. Each spermatogonium contains 46 chromosomes. Spermatogonia forms spermatocyte that undergoes meiotic division to...
Seminiferous tubules are highly coiled structures present in testicular lobules. The seminiferous tubules are lined by two types of cells i.e. spermatogonia and sertoli cells from inside. Spermatogonia are the male germ cells that form sperms through meiotic divisions followed by mitotic division, while Sertoli cells provide nutrition to the germ cells. The regions outside the seminiferous...
Functions of testis 1. Testis produces spermatozoa which are male gametes.  2. In testis, the male sex hormone testosterone is developed. Functions of ovary 1. The ovary produces ovum by the process oogenesis. 2. Graffian follicles in ovary produce female sex hormone called estrogen. 
Labelled diagram of the male reproductive system is as follows:   
                   (a) Humans reproduce sexually                     (b) Humans are viviparous                      (c) Fertilisation is internal in humans                     (d) Male and female gametes are haploid                     (e) Zygote is diploid                                                                                                                                (f) The...