1 male reproductive system external genitalia 13-05-07 sunday by prof. ansari

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MALE REPRODUCTIVE SYSTEM

EXTERNAL GENITALIA

13-05-07SUNDAY

BYPROF. ANSARI

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OBJECTIVES OF MALE REPRODUCTIVE SYSTEM

DEFINES:- Scrotum/testis/epididymis/ductus deferens/prostate/external genital organs.

IDENTIFIES & DESCRIBES:- Testis

Right,left,structure/coverings/poles/surfaces.

Epididymis/structure and position/parts/sinus epididymis.

Spermatic cord/extent/major components.

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Ductus deferens:- structure/origin/course/termination/relations

Testis:- structure/position/relationships/ducts/ejaculatory ducts.

Prostate:- structure/size and position/surfaces/relationships/ subdivision/ features of the prostatic uretha.

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Penis: parts.

Components structures:

o Corpora cavernosa.

o Corpus spongiosum.

o Erectile tissue.

o Dorsal artery.

o Deep arteries.

o Tunica albuginea.

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Scrotum: Wall / dartos muscle / contents and their coverings.

Describes: constituents of the wall of the scrotum and their continuity with the anterolateral wall.

Covering of the spermatic cord and testis: their derivation from the structures of the abdominal wall.

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Blood supply and lymphatic drainage of the testis.

Venous and lymphatic drainage of the penis.

Mechanisms of erection and ejaculation

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MALE EXTERNAL GENITALIA

Consists of:

Penis

Scrotum

Spermatic cord

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Parts of penis

Root having bulb and two crura.

Body /shaft having erectile tissues corpus cavernosum and corpus spongiosum.

Glans penis

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Suspensory ligament of penis

It is a triangular sheet of fibrous tissue that hangs the penis from the pubic symphysis.

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The penis is a male copulatory organ, also conveys the urethra

Which provides the common outlet for urine and semen.The penis consists of a root,body,and glans.It is composed of three cylindrical bodies of erectile cavernous tissue.The paired corpora cavernosa dorsally and single corpus spongiosum ventrally.

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The Root of the Penis is the fixed part, consists of:-

The crura,bulb,ischiocavernosus and bulbospongiosus muscles.

The root is located in superficial perineal pouch, between the perineal membrane and deep perineal fascia.

Each crus is attached to the ischial ramus, bulb is attached to the perineal membrane.

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The Perineal membrane

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The Body of Penis and Glans

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t.s. of penis Sagital section

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Blood supply 3 paired arteries

Artery to bulb supply corpus spongiosum & glans.

Deep artery of penis supply corpus cavernosum.

Dorsal artery of penis supply the skin.

All branches of internal pudendal artery.

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Venous Return

Internal pudendal veins.

Deep dorsal veins.

Superficial dorsal vein drains the dorsal skin of penis.

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Lymphatic drainage

Superficial inguinal nodes drains penile skin.

Glans & corpora drained by deep inguinal nodes.

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Nerve Supply:

Pudendal nerve, posterior scrotal and dorsal nerves supply glans.Dermatome S2.Muscles bulbospongiosus & ischiocavernosus S2 perineal branch of pudendal nerve.Sympathetic nerve for ejaculation L1 segment via superior & inferior hypogastric plexus.Parasympathtic nerves S2 + S3 pelvic splanchnic nerves for erection.

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SCROTUM

A POUCH OF SKIN THAT ENCLOSES THE TESTES.

Layers are:- Skin,Dartos muscle,External spermatic fascia,Cremasteric fascia,Internal spermatic fascia,tunica vaginalis and tunica albugenia.

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Blood Supply

Superficial and deep external pudendal arteries from femoral artery.

Internal pudendal artery.

Veins:- external pudendal veins.

Superficial and deep veins drain into long saphenous vein.

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Lymphatic Drainage

Medial group of superficial inguinal lymph nodes.

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Nerve supply

Anterior 1/3 of scrotum skin supplied by ilioinguinal nerve and genital branch of genitofemoral nerve.Posterior aspect of scrotum supplied by sacral plexus,pudendal nerve and perineal branch of posterior femoral cutaneous nerve.Sympathetic nerves regulates thermoregulation.

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Spermatic Cord

It is a tubulomuscular cord that suspends the testis in the scrotal sac.

Its covering includes 1.internal spermatic fascia,2.cremasteric fascia,3.external spermatic fascia.

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Constituents of Spermatic Cord

Ductus deferens, 45 cm.tube that carries sperms from testis to out side.Testicular artery, branch of abdominal aorta.Artery of ductus deferens,from inferior vesicle artery.Cremasteric artery.Pampiniform plexus.Lymphatic plexus and nerve plexus and genital branch of genitofemoral nerve.

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Applied Anatomy

Orchitis

Hernias

Hydrocele

Phimosis

Paraphimosis

Circumcision

Hypospadias

epispadias

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Inguinal Hernia

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HYPOSPADIASIS

The normal external urethral meatus opens on the tip of the glans penis.If it opens on the ventral aspect of the shaft of penis, it is an abnormal condition called hypospadias.It is due to abnormal nonclosure of urethral grooves, during the development of urethra.

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EPISPADIAS

The abnormal urethral opening is on the dorsal aspect of the shaft of penis.

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Epispadias is Associated with Extrophy of Urinary Bladder

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Chordee is the abnormal flexion of the shaft of penis

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NORMAL DEVELOPMENT OF PENIS & SCROTUM

THE GENITAL TUBERCLE

AND THE GENITAL SWELLINGS

WILL GIVE RISE TO THE PENIS & SCROTUM.

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Thank You