The accessory glands of the male reproductive system include the paired seminal vesicles and bulbourethral glands also called Cowper's gland arid a single prostate gland.

(i) The epididymis is a single highly coiled tube that temporarily stores the spermatozoa and they undergo physiological maturation and acquire increased motility and fertilizing capacity.
(ii) It is found in the testis.

The accessory ducts associated with the male reproductive system include rete testis, vasa efferentia, epididymis and vas deferens.

(i) Leydig cells or Interstitial cells are found in soft connective tissue surrounding the seminiferous tubules of tests and are endocrine in nature.
(ii) They secrete androgens namely testosterone. Hormone which initiates the process of spermatogenesis.

(i) Sertoli cells or nurse cell
(ii) Spermatogonic cells

Expulsion of the baby from the mother's womb is called Parturition.

Formation of specific tissues, organs and organ systems from three germ layers is called Organogenesis.

It is a process by which blastocyst is changed into a gastrula with three primary germ layers, namely ectoderm, endoderm and mesoderm.

The process of formation of placenta which is the intimate connection between foetus and uterine wall of the mother for exchange of nutrients is called Placentation.

Attachment of blastocyst to the uterine wall is called Implantation.

Cleavage refers to the rapid mitotic divisions of the zygote which convert the single celled zygote into a multicellular structure called blastocyst.

Fusion of male and female gametes to form zygote, is called fertilisation.

Transfer of sperms by the male into the female genital tract is called Insemination.

Formation of gametes in males and females by spermatogenesis and oogenesis respectively

(a) Sertoli cells or Nurse cells
(b) Spermatogonic cells or male germ cells.