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Reproductive Anatomy Ch. 27

Reproductive Anatomy Ch. 27. Male Reproduction. The Testes. Each testis is surrounded by two tunics tunica vaginalis tunica albuginea Septa divide the testis into 250-300 lobules, each containing 1-4 seminiferous tubules Seminiferous tubules  Produce sperm

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Reproductive Anatomy Ch. 27

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  1. Reproductive AnatomyCh. 27

  2. Male Reproduction

  3. The Testes • Each testis is surrounded by two tunics • tunica vaginalis • tunica albuginea • Septa divide the testis into 250-300 lobules, each containing 1-4 seminiferous tubules • Seminiferous tubules  • Produce sperm • Interstitial cells between tubules produce androgens • Tubulus rectus  • Rete testis 

  4. Figure 27.3a

  5. After leaving the testes sperm go to • Efferent ductules  • Epididymis  • Ductus (vas) deferens  • Site of vasectomy • Ejaculatory duct  • and finally the Urethra

  6. Male Reproductive System Figure 27.1

  7. Scrotum • Sac of skin and superficial fascia • Hangs outside the abdominopelvic cavity at the root of the penis • Contains paired testicles separated by a midline septum • Keeps the testes ~3C lower than core body temperature • Position held by cremaster and dartos muscles

  8. Figure 27.2

  9. The Penis • Copulatory organ • Designed to deliver sperm into the female reproductive tract • Attached root and free shaft, ending in glans penis • Prepuce (foreskin) • Skin covering the distal end of the penis • Circumcision – surgical removal of the foreskin after birth

  10. The Penis Figure 27.4

  11. Internal penis • Part of the urethra • 3 cylindrical bodies of erectile tissue • spongy network of connective tissue, smooth muscle, and vascular spaces

  12. Corpus spongiosum • surrounds urethra and expands to form the glans and bulb of the penis • Corpora cavernosa • paired dorsal erectile bodies

  13. Figure 27.4

  14. Accessory Glands Empty secretions into ducts that combine with sperm to form semen • Seminal vesicles • Prostate gland • Bulbourethral glands

  15. 1. Seminal Vesicles • Lie on the posterior wall of the bladder • Secretes 60% of the volume of semen • Join the ductus deferens to form the ejaculatory duct • Sperm and seminal fluid mix in the ejaculatory duct  • Enter the prostatic urethra during ejaculation

  16. Male Reproductive System Figure 27.1

  17. 2. Prostate Gland • Doughnut-shaped gland that encircles part of the urethra, inferior to the bladder • Accounts for 33% of the semen • Milky, slightly acid fluid • Contains citrate, various enzymes, and prostate-specific antigen (PSA) • Plays a role in the activation of sperm • Enters the prostatic urethra during ejaculation

  18. Male Reproductive System Figure 27.1

  19. 3. Bulbourethral (Cowper’s) glands • Pea-sized glands inferior to the prostate • Produce thick, clear mucus prior to ejaculation

  20. Male Reproductive System Figure 27.1

  21. Semen • Provides a transport medium, nutrients, protection for and activates sperm • Viscous, alkaline fluid • Neutralizes the acid environment found in the male urethra and female vagina • Fructose + ascorbic acid provide nutrients for sperm • Prostaglandins • Decrease the viscosity of mucus in the cervix • Stimulates reverse peristalsis in the uterus • Relaxin hormone enhances sperm motility • Seminalplasmin acts as an antibiotic • Clotting factors + enzymes (vesiculase) coagulate semen immediately after ejaculation  • Then fibrinolysin liquefies the sticky mass

  22. Ejaculation • The propulsion of semen from the male duct system • At ejaculation, SNS cause: • Reproductive ducts and accessory organs to contract and empty their contents • The bladder sphincter muscle to constrict, preventing the expulsion of urine • Bulbospongiosus muscles to undergo a rapid series of contractions • Propulsion of semen from the urethra

  23. Female ReproductionCh. 27

  24. Ovaries • Surrounded by • fibrous tunica albuginea • covered germinal epithelium

  25. Female Reproductive Anatomy • Ovaries • Make female gametes (ova) • Secrete female sex hormones (estrogen and progesterone) • Accessory ducts include uterine/fallopian tubes, uterus, and vagina • External genitalia – external sex organs

  26. Figure 27.11

  27. The Ovaries Figure 27.14a

  28. Ovaries • Follicles embedded in cortex • Each follicle consists of an immature oocyte • Cells around the oocyte are called: • Follicle cells • Granulosa cells

  29. Ovaries • Primordial follicle – one layer of squamous-like follicle cells surrounds the oocyte

  30. Ovaries • Primary follicle – two or more layers of cuboidal granulosa cells enclose the oocyte

  31. Ovaries • Secondary follicle – fluid-filled space between granulosa cells that coalesces to form a central antrum

  32. Ovaries • Graafian follicle – secondary follicle at its most mature stage that bulges from the surface of the ovary

  33. Ovaries • Ovulation – ejection of the oocyte from the ripening follicle

  34. Ovaries • Corpus luteum – ruptured follicle after ovulation

  35. Uterine Tubes (Fallopian Tubes) and Oviducts • Receives ovulated oocyte • Site for fertilization • Oocyte moves into peritoneal cavity • Grasped by beating fimbriae of the infundibulum in the tube’s ampulla • Moves through tubes via peristalsis and ciliary action • Empties it into superolateral region of uterus, via the isthmus

  36. Uterus • Hollow, thick-walled organ located in the pelvis anterior to the rectum and posterosuperior to the bladder • Body – major portion of the uterus • Fundus – rounded region superior to the entrance of the uterine tubes • Isthmus – narrowed region between the body and cervix • Cervix – narrow neck which projects into the vagina inferiorly

  37. Uterine Wall • Composed of three layers • Perimetrium • outermost serous layer; the visceral peritoneum • Myometrium • middle layer; interlacing layers of smooth muscle • Endometrium • mucosal lining of the uterine cavity • glandular

  38. Uterine Wall Figure 27.15b

  39. Vagina • Thin-walled tube lying between the bladder and the rectum, extending from the cervix to the exterior of the body • The urethra is embedded in the anterior wall • Provides a passageway for birth, menstrual flow, and is the organ of copulation

  40. External Genitalia: Vulva (Pudendum) • Lies external to the vagina and includes the mons pubis, labia, clitoris, and vestibular structures • Mons pubis – round, fatty area overlying the pubic symphysis • Labia majora – elongated, hair-covered, fatty skin folds homologous to the male scrotum • Labia minora – hair-free skin folds lying within the labia majora; homologous to the ventral penis

  41. Vagina Figure 27.16

  42. External Genitalia: Vulva (Pudendum) • Greater vestibular glands • Pea-size glands flanking the vagina • Homologous to the bulbourethral glands • Keep the vestibule moist and lubricated

  43. External Genitalia: Vulva (Pudendum) • Clitoris (homologous to the penis) • Erectile tissue hooded by the prepuce • The exposed portion is called the glans • Perineum • Diamond-shaped region between the pubic arch and coccyx • Bordered by the ischial tuberosities laterally

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