Male Reproductive Anatomy Front View Seminal vesicle behind

Male Reproductive Anatomy (Front View) Seminal vesicle (behind bladder) (Urinary bladder) Prostate gland Urethra Scrotum Bulbourethral gland Erectile tissue of penis Vas deferens Epididymis Testis

Male Reproductive Anatomy (Side View) (Urinary bladder) (Urinary duct) Seminal vesicle (Rectum) Vas deferens (Pubic bone) Ejaculatory duct Erectile tissue Prostate gland Urethra Bulbourethral gland Vas deferens Epididymis Testis Scrotum Glans Prepuce Penis

Female Reproductive Anatomy (Front View) Ovaries Uterus Oviduct Uterine wall Endometrium Cervix Vagina Follicles Corpus luteum

Female Reproductive Anatomy (Side View) Oviduct Ovary Uterus (Urinary bladder) (Rectum) (Pubic bone) Cervix Urethra Shaft Glans Prepuce Vaginal opening Clitoris Labia minora Labia majora

Epididymis Spermatogenesis Seminiferous tubule Testis Cross section of seminiferous tubule Primordial germ cell in embryo Mitotic divisions Sertoli cell nucleus Spermatogonial stem cell 2 n Mitotic divisions Spermatogonium 2 n Mitotic divisions Primary spermatocyte 2 n Meiosis I Lumen of seminiferous tubule Secondary spermatocyte n n Meiosis II Neck Tail Midpiece Head Spermatids (at two stages of differentiation) Early spermatid n n n Differentiation (Sertoli cells provide nutrients) Plasma membrane Mitochondria Sperm Nucleus Acrosome n n

Spermatogenesis (Expanded View) Epididymis Seminiferous tubule Sertoli cell nucleus Spermatogonium Testis Cross section of seminiferous tubule Primary spermatocyte Secondary spermatocyte Spermatids (two stages) Lumen of seminiferous tubule Sperm

Primordial germ cell in embryo Spermatogenesis Mitotic divisions Spermatogonial stem cell 2 n Mitotic divisions Spermatogonium 2 n Mitotic divisions Primary spermatocyte 2 n Meiosis I Secondary spermatocyte n n Meiosis II Early spermatid n n n Differentiation (Sertoli cells provide nutrients) Sperm n n

Anatomy of Spermatozoon Neck Tail Midpiece Head Plasma membrane Mitochondria Nucleus Acrosome

Oogenesis Ovary Primary oocyte within follicle In embryo Growing follicle Primordial germ cell Mitotic divisions 2 n Oogonium Mitotic divisions Primary oocyte (present at birth), arrested in prophase of meiosis I 2 n Completion of meiosis I and onset of meiosis II First polar n body n Secondary oocyte, arrested at metaphase of meiosis II Ovulation, sperm entry Mature follicle Ruptured follicle Ovulated secondary oocyte Completion of meiosis II Second polar n body Corpus luteum n Fertilized egg Degenerating corpus luteum

Ovary Oogenesis (Expanded View) Primary oocyte within follicle Growing follicle Ruptured follicle Ovulated secondary oocyte Corpus luteum Mature follicle Degenerating corpus luteum

In embryo Oogenesis (Expanded) Primordial germ cell Mitotic divisions 2 n Oogonium Mitotic divisions Primary oocyte (present at birth), arrested in prophase of meiosis I 2 n First polar body Completion of meiosis I and onset of meiosis II n n Secondary oocyte, arrested at metaphase of meiosis II Ovulation, sperm entry Completion of meiosis II Second polar n body n Fertilized egg

Anatomy of Ovum Second polar body

Spermatogenesis v. Oogenesis