Male Reproductive System 15

Gonads

Produce gametes (haploids) and is primary organ.

Testis

Male gonad and produces gametes (spermatozoa). Produce testosterone

Ovary

Female gonad

Ova

Female gametes

Epididymis, ductus deferens, and urethra

Accessory ducts for storage, maturation, and transportation of sperm

Penis/scrotum

External genitalia

Organs

Ductus deferens

Transports sperm from scrotum through pelvic cavity to urethra

Structure of testis

Function of testis

Sperm production and secrete testosterone

Sperm production

Spermatogenesis and spermiogenesis

Spermatogenesis

Diploid stem cell [spermatogonium] divides via mitosis to produce type A and B. Type A repeats cell division. Type B produces spermatocytes that undergo meiosis 1 producing secondary that undergo meiosis 2 to produce haploid gametes (spermatids)

Spermiogenesis

Converts spermatid into spermatozoan (sperm)

Testosterone secretion

Performed by interstitial cells located in seminiferous tubules

Testosterone targets

Stimulation of trellis cells to promote Spermatogenesis; stimulate bone and muscle growth; secondary sexual characteristics; libido; accessory glands

Cross section of seminiferous tubule