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| 31. | inguinal canal | opening in abdominal wall that connects the testes to the abdominal cavity |
| 32. | isthmus | narrow, medial portion of the uterine tube that joins the uterus |
| 33. | Leydig cells | cells between the seminiferous tubules of the testes that produce testosterone; a type of interstitial cell |
| 34. | labia majora | hair-covered folds of skin located behind the mons pubis |
| 35. | labia minora | thin, pigmented, hairless flaps of skin located medial and deep to the labia majora |
| 36. | lactiferous ducts | ducts that connect the mammary glands to the nipple and allow for the transport of milk |
| 37. | lactiferous sinus | area of milk collection between alveoli and lactiferous duct |
| 38. | Müllerian duct | duct system present in the embryo that will eventually form the internal female reproductive structures |
| 39. | mammary glands | glands inside the breast that secrete milk |
| 40. | menarche | first menstruation in a pubertal female |
| 41. | menses phase | phase of the menstrual cycle in which the endometrial lining is shed |
| 42. | menses | shedding of the inner portion of the endometrium out though the vagina; also referred to as menstruation |
| 43. | menstrual cycle | approximately 28-day cycle of changes in the uterus consisting of a menses phase, a proliferative phase, and a secretory phase |
| 44. | mons pubis | mound of fatty tissue located at the front of the vulva |
| 45. | myometrium | smooth muscle layer of uterus that allows for uterine contractions during labor and expulsion of menstrual blood |
| 46. | oocyte | cell that results from the division of the oogonium and undergoes meiosis I at the LH surge and meiosis II at fertilization to become a haploid ovum |
| 47. | oogenesis | process by which oogonia divide by mitosis to primary oocytes, which undergo meiosis to produce the secondary oocyte and, upon fertilization, the ovum |
| 48. | oogonia | ovarian stem cells that undergo mitosis during female fetal development to form primary oocytes |
| 49. | ovarian cycle | approximately 28-day cycle of changes in the ovary consisting of a follicular phase and a luteal phase |
| 50. | ovaries | female gonads that produce oocytes and sex steroid hormones (notably estrogen and progesterone) |
| 51. | ovulation | release of a secondary oocyte and associated granulosa cells from an ovary |
| 52. | ovum | haploid female gamete resulting from completion of meiosis II at fertilization |
| 53. | penis | male organ of copulation |
| 54. | perimetrium | outer epithelial layer of uterine wall |
| 55. | polar body | smaller cell produced during the process of meiosis in oogenesis |
| 56. | prepuce | (also, foreskin) flap of skin that forms a collar around, and thus protects and lubricates, the glans penis; also referred as the foreskin |
| 57. | primary follicles | ovarian follicles with a primary oocyte and one layer of cuboidal granulosa cells |
| 58. | primordial follicles | least developed ovarian follicles that consist of a single oocyte and a single layer of flat (squamous) granulosa cells |
| 59. | proliferative phase | phase of the menstrual cycle in which the endometrium proliferates |
| 60. | prostate gland | doughnut-shaped gland at the base of the bladder surrounding the urethra and contributing fluid to semen during ejaculation |
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