Male Genital System (Internal & External) - Anatomy

Content:
Introduction: 0:00
Internal Genital Organs: 0:25
Testis: 0:45
Epididymis: 6:50
Coverings and Fixation of Testes and Epididymis: 8:54
Spermatic Cord: 11:44
Ductus Deferens: 14:08
Seminal Gland: 15:40
Prostate: 16:26
Bulbourethral Glands: 19:16
Male Urethra: 19:47
Penis: 20:45
Scrotum: 26:55
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Male Genital Organs (Organa genitalia masculina)
- Internal Genital Organs
- External Genital Organs
Internal Genital Organs
Testis
- Male reproductive gland
- Leydig Cells (produce testosterone)
- Sertoli Cells (Structural support and support spermatogenesis)
- Prenatal Development:
○ Originate in lumbar region
○ Decend and take the abdominal layers with it to form the scrotal layers
- External Structures of Testis
○ Upper pole (Extremitas Superior)
○ Lower Pole (Extremitas Inferior)
○ Anterior Border (Margo Anterior)
○ Posterior Border (Margo Posterior)
○ Lateral Surface (facies lateralis)
○ Medial Surface (Facies Medialis)
- Internal Structures of Testis
○ Tunica Albuginea
○ Vascular Layer (Tunica Vasculosa)
○ Septa of Testis (septula testis)
○ Lobules of testis (lobuli testis)
○ Convoluted seminiferous tubules (tubuli seminiferi contori)
○ Straight Tubules (tubuli seminiferi recti)
○ Rete Testis
○ Efferent Ductules (ductuli efferentes testis)
Epididymis
- Composed of tightly packed tubes
- Serves as a reservoir of spermatozoa
- Head of Epididymis (Caput epindidymidis)
- Body of Epididymis (corpus epididymidis)
- Tail of Epididymis (cauda epididymidis)
- Sinus of epididymis (sinus epididymidis)
Coverings and External Fixation of Testes and Epididymis
- Tunica Vaginalis (tunica vaginalis testis)
○ Visceral Layer (Lamina visceralis/epiorchium)
○ Parietal Layer (Lamina parietalis/periorchium)
- Internal Spermatic Fascia (fascia spermatica interna)
- Cremaster
- External Spermatic Fascia (Fascia spermatica externa)
- Dartos Fascia (tunica dartos)
Spermatic Cord (Funiculus Spermaticus)
- Ductus Deferens
- Artery to ductus deferens (arteria ductus deferentis)
- Testicular Artery
- Lymph vessels
- Pampiniform plexus (plexus pampiniformis)
- Testicular plexus (plexus testicularis)
- Deferential plexus (plexus deferentialis)
Ductus Deferens
- Scrotal Part (pars scrotalis)
- Funicular Part (pars funicularis)
- Inguinal Part (pars inguinalis)
- Pelvic Part (pars pelvica)
- Ampulla of ductus deferens (ampulla ductus deferentis)
Seminal Gland (glandula vesiculosa)
- Simple tubular gland. Produces ejaculate fluid
- Excretory duct (ductus excretorius)
- Fuse with ductus deferens to form ejaculatory duct (ductus ejaculatorius)
Prostate (prostata)
- Base of prostate (basis prostatae)
- Apex of Prostate (apex prostatae)
- Posterior Surface (facies posterior)
- Anterior Surface (facies anterior)
- Prostatic Urethra (pars prostatica urethrae)
- Histological Zones
○ Peripheral Zone (Zona peripheralis)
○ Central Zone (zona centralis)
○ Transitional Zone (zona transitionis)
○ Anterior fibromuscular stroma
- Posterior Surface
○ Prostatic Ductules (ductuli prostatici)
○ Urethral Crest (crista urethralis)
○ Seminal Colliculus (colliculus seminalis)
○ Prostatic Utricle (Fetus) (utriculus prostaticus)
○ Openings of the ejsaculatory ducts
Bulbo-urethral glands (glandulae bulbourethrales)
- Empties into beginning of spongious urethra
Male urethra (urethra masculina)
- Prostatic Urethra
- Membranous Urethra
- Spongy Urethra
External Genital Organs
Penis
- External Structures
○ Root of Penis (Radix Penis)
§ Bulb of penis (bulbus penis)
§ Crura of penis (crura penis)
○ Body of penis (corpus penis)
§ Corpora Cavernosa Penis
§ Corpus Spongiosum penis
§ Dorsum of penis (facies dorsalis penis)
§ Urethral Surface (facues urethralis)
§ Fundiform ligament of penis (ligamentum fundiforme penis)
§ Suspensory ligament of penis (ligamentum suspensorium penis)
§ Raphe of penis
○ Glans penis
§ Corona of Glans
§ Neck of Glans (collum glandis)
§ Foreskin / Prepuce (preputium)
§ Frenulum
§ Preputial glands / Tyson's glands (glandulae preputiales) produces smegma
- Internal Surface of Penis
○ Corpora Cavernosa Penis
○ Corpus Spngiosum Penis
○ Tunica Albuginea
○ Deep fascia of penis / Buck' fascia (fascia penis profunda)
○ Superficial fascia of penis (fascia penis superficialis)
Scrotum
- Tunica Vaginalis
- Internal Spermatic Fascia
- Cremaster
- External Spermatic Fascia
- Dartos Fascia
- Skin
Sources:
- Complete Anatomy by 3d4medical
- Biorender
- Memorix Anatomy 2nd Edition by Hudák Radovan (Author), Kachlík David (Author), Volný Ondřej (Author)
- Snell, Richard S. (2012). Clinical anatomy by regions (9th)
- University notes and lectures

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