REPRO I

Reproductive System Overview

  • Comparison: Male vs. Female Anatomy

    • Male Anatomy: Organs, ducts, and tracts involved in reproduction.

    • Female Anatomy: Organs and structures related to reproduction.

Gamete Production & Maturation

  • Process: Both male and female gametes undergo specific production and maturation processes in respective reproductive organs.

Reproductive Cycle

  • Involves hormonal regulation and physiological changes in both genders.

Pregnancy and Development

  • Key focus on how fertilization and zygote implantation occur in the female reproductive system.

Male Reproductive Anatomy

  • Efferent Ductules: Transport sperm from the testis.

  • Epididymis: Maturation and storage of sperm.

    • Components: Head, body, and tail of epididymis.

  • Testis: Produces male gametes (sperm).

    • Internal Structures: Seminiferous tubules, rete testis, tunica albuginea, tunica vaginalis.

  • Supporting Structures: Scrotum and penis, which assist in reproduction.

Female Reproductive Anatomy

  • Ovary: Produces ova, contains follicles.

  • Uterus: Site for implantation and fetal development.

  • Uterine Tubes: Transport ova and are the site of fertilization.

Objectives of Studying Male Reproductive System

  1. Describe male reproductive tract anatomy, including ducts and glands.

  2. Understand the process of spermatogenesis.

  3. Identify roles of germ, Sertoli, and Leydig cells.

  4. Distinguish spermatogenesis phases: spermatogenesis, spermiation, spermiogenesis.

  5. Explain spermatozoa structures: acrosome, tail, mitochondrial sheath.

  6. Detail hormonal influences on testosterone secretion and spermatogenesis.

  7. Describe neural control mechanisms for erection.

Male Reproductive Tract Structure

  • Composed of:

    1. Testes: site for sperm production.

    2. Ducts for sperm transport.

    3. Accessory glands for fluid contribution.

    4. Supporting structures such as penis and scrotum.

Testicular Anatomy

  • Seminiferous Tubules: Site of sperm production.

    • Sertoli Cells: Nurse cells supporting sperm development.

    • Leydig Cells:Produce testosterone.

Spermatogenesis

  • Process: Involves transformation of spermatogonia into mature spermatozoa.

    • Meiosis: Division leads to haploid sperm.

    • Spermiogenesis: Morphological changes for motility.

Stages of Sperm Formation

  1. Spermatogonia: Stem cells undergoing mitosis.

  2. Primary Spermatocyte: After meiosis I.

  3. Secondary Spermatocyte: After meiosis II.

  4. Spermatids: Later develop into sperm.

Hormonal Control of Spermatogenesis

  • Triggered by GnRH at puberty, increasing LH and FSH.

    • LH: Stimulates testosterone production.

    • FSH: Promotes spermatogenesis and acts on Sertoli cells.

    • Inhibin: Released by Sertoli cells to regulate FSH levels.

Accessory Glands Contributions to Semen

  • Seminal Vesicles: About 60% semen volume, containing fructose and prostaglandins.

  • Prostate: Contributes ~25% semen volume, contains proteolytic enzymes.

  • Bulbourethral Gland: Adds a mucous-like fluid for lubrication and pH buffering.

Neural Control of Erection

  • Pudendal Nerve: Key in transmitting signals to achieve and maintain erection.

  • Mechanism: Blood flow increases, engorging erectile tissue, compressing venules to preserve erection.

  • Diagrammatic Representation: Illustrates blood flow and structural changes during erection.