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| 61. | puberty | life stage during which a male or female adolescent becomes anatomically and physiologically capable of reproduction |
| 62. | rugae | (of the vagina) folds of skin in the vagina that allow it to stretch during intercourse and childbirth |
| 63. | Sertoli cells | cells that support germ cells through the process of spermatogenesis; a type of sustentacular cell |
| 64. | scrotum | external pouch of skin and muscle that houses the testes |
| 65. | secondary follicles | ovarian follicles with a primary oocyte and multiple layers of granulosa cells |
| 66. | secondary sex characteristics | physical characteristics that are influenced by sex steroid hormones and have supporting roles in reproductive function |
| 67. | secretory phase | phase of the menstrual cycle in which the endometrium secretes a nutrient-rich fluid in preparation for implantation of an embryo |
| 68. | semen | ejaculatory fluid composed of sperm and secretions from the seminal vesicles, prostate, and bulbourethral glands |
| 69. | seminal vesicle | gland that produces seminal fluid, which contributes to semen |
| 70. | seminiferous tubules | tube structures within the testes where spermatogenesis occurs |
| 71. | spermatic cord | bundle of nerves and blood vessels that supplies the testes; contains ductus deferens |
| 72. | spermatid | immature sperm cells produced by meiosis II of secondary spermatocytes |
| 73. | spermatocyte | cell that results from the division of spermatogonium and undergoes meiosis I and meiosis II to form spermatids |
| 74. | spermatogenesis | formation of new sperm, occurs in the seminiferous tubules of the testes |
| 75. | spermatogonia | (singular: spermatogonium) diploid precursor cells that become sperm |
| 76. | spermiogenesis | transformation of spermatids to spermatozoa during spermatogenesis |
| 77. | sperm | (also, spermatozoon) male gamete |
| 78. | suspensory ligaments | bands of connective tissue that suspend the breast onto the chest wall by attachment to the overlying dermis |
| 79. | tertiary follicles | (also, antral follicles) ovarian follicles with a primary or secondary oocyte, multiple layers of granulosa cells, and a fully formed antrum |
| 80. | testes | (singular: testis) male gonads |
| 81. | theca cells | estrogen-producing cells in a maturing ovarian follicle |
| 82. | uterine tubes | (also, fallopian tubes or oviducts) ducts that facilitate transport of an ovulated oocyte to the uterus |
| 83. | uterus | muscular hollow organ in which a fertilized egg develops into a fetus |
| 84. | vagina | tunnel-like organ that provides access to the uterus for the insertion of semen and from the uterus for the birth of a baby |
| 85. | vulva | external female genitalia |
| 86. | Wolffian duct | duct system present in the embryo that will eventually form the internal male reproductive structures |
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