The Male Reproductive System SHANDONG UNIVERSITY Liu Zhiyu

The Male Reproductive System SHANDONG UNIVERSITY Liu Zhiyu

The Male Reproductive System Composion: n Internal genital organs Gonad-testes The duct of conveying sperms: includes Epididymes Ductus deferens duct Male urethra Accessory glands n External genital organs Scrotum Penis

internal genital organs 1. Shape Superior extremity Inferior extremity Anterior borfer Posterior border (一)Gonad –testis Medial Paired, ovoidsurface organs, Lateral surface Located in scrotum

1. Shape of the testes Superior extremity posterior border inferior extremity Anterior border

(一)testis 2. Structure n tunica albuginea mediastinum testis sends numerous fibrous septules into the gland, dividing it into 100～ 200 testicular lobulesthat contain 2～ 4 contorted seminiferous tubules → traight seminiferous tubules →rete testis

contorted seminiferous tubules straight seminiferous tubules rete testis

1. testis 2. Structure n n efferent ducts of testis, 12 ～ 15 in number Function of epididymis: Produces sperm secrete androgens

(二) Genital ducts 1. Epididymis Shape：Comma-shaped, head of epididymis body of epididymis Position：Located on tail ofextremity epididymis superior and posterior border of testis Function – the site of accumulation and storage of sperm

2. Ductus deferens Muscular tube that transports sperm form epididymis to ejaculatory duct n n q Four part: Testicular part －extends form the tail of epididymis to the superior extremity of testis

2. Ductus deferens q Spermatic part － form superior extremity of testis to the superficial inguinal ring, ---- where the vasectomy is performed Inguinal part － extends form superficial to deep inguinal rings q

2. Ductus deferens Pelvic part － crosses the ureter to reach the base of bladder, terminal part dilates, -----ampulla ductus deferentis q

Spermatic cord n n Extends from the superior extremity of testis to the deep inguinal ring spermatic cord comprise: Ductus deferens Testicular artery Pampiniform plexus of vein Nerves and lymphatic vessels Vestige of vagina process

Spermatic cord These structures are enclosed by 3 layers of tunic q q q internal spermatic fascia cremaster external spermatic fascia

3. Ejaculatory duct n n Formed by union of distal portion ductus deferens and excretory duct of seminal vesicle Passes through the upper part of prostate and opens into the prostatic part of urethra ejaculatory duct

(三) Accessory glands 1. Seminal vesicle n n n Paired sacculated, coiled glands Secrete part of seminal fluid Located on posterior surface of bladder, lateral to ampulla ductus deferens seminal vesicle

2. Prostate position n Lies behind pubic symphysis, between neck of bladder and urogenital diaphragm n Shape q Chestnut-shaped organ Base of prostate peostate Apex of prostate Body of peostate Anterior surfaces Posterior surfaces－prostatic sulcus

2. Prostate Capsule of protate Sheath of protate Contains ofby fivepelvic lobesfascia formed Anterior lobe Middle lobe Posterior lobe Right and left lobes

3. Bulbourethral gland －two small pea-shaped glands, located in the deep transverse muscle of perineum, opens into bulb of urethra bulbourethral gland

External genital organs (一) Scrotum n Pouch of thin skin lying below the root of the penis n Divided into two haves by septum of scrotum, contains testes and epididymis

External genital organs (一) Scrotum n The wall of the testis consist of skin and dartos coat, a connective tissue layer that contains many smooth muscle fibers which is contineus anteriorly to the scarpa’s fascia of abdomen and posteriorly with Colles fascia of perineum

The coverings of testis and spermatic cord Parietal peritoneum Transvers fascia Trasversus abdominis Obliquus internus abdominis Aponeurosis of obliquus externus abdominis External spermatic fascia Cremastter Parietal layer Visceral layer Internal spermatic fascia Tunica vaginalis of testis Vaginal cavity

(二) n Penis division: root body glans penis • Consists of Cavernous body of penis: 2 Cavernous body of urethra : 1

(二) Penis Skin－thin and loose Prepuce of penis Frenulum of prepuce

(三) Male urethra Three parts n Prostatic part －lies within the prostate n Membranous part– lies within the urogenital diaphragm surround by the sphincter of urethra n Cavernous part － transverse the all length of cavernous body of urethra

(三) Male urethra Posterior urethra prostatic part membranous part Anterior urethra cavernous part

(三) Male urethra Three constrictions n n n internal urethral orifice membranous part external orifice of urethra Three enlarged parts n n n At prostatic part At bulb of urethra At navicular fossa of urethra

(三) Male urethra Two curvatures Subpubic curvature －concave upward Prepubic curvature －concave downward

(三) Male urethra Within prostatic part Urethral ridge Seminal colliculus Prostatic utricle orifices of the ejaculatory ducts

gubernaculum of tastis vagianal process vagianal ligament tunica vaginalis of tastis parietal layer visceral layer vaginal cavity

ampulla ductus deferentis

Spermatic part