Male Genital System (Internal & External) - Anatomy
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Content:
0:00 Introduction
0:25 Internal Genital Organs
0:45 Testis
6:50 Epididymis
8:54 Coverings and Fixation of Testes and Epididymis
11:44 Spermatic Cord
14:08 Ductus Deferens
15:40 Seminal Gland
16:26 Prostate
19:16 Bulbourethral Glands
19:47 Male Urethra
20:45 Penis
26:55 Scrotum
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
Snell, Richard S. (2012). Clinical anatomy by regions (9th)
University notes and lectures