UROGENITAL DIAPHRAGM

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Urogenital diaphragm : 

Urogenital diaphragm Dr. Nazim Nasir ( jr-1 ) Department of Anatomy JNMC AMU Aligarh.

definition : 

definition Layer of the pelvis that separates the deep perineal sac from the upper pelvis. Lying between the inferior fascia of the urogenital diaphragm and superior fascia of the urogenital diaphragm. Constituents Deep perineal muscles- sphincter urethrae & deep transverse perinei. Sup. & inf. Fascia of UGD.

Boundaries of the Perineum : 

Boundaries of the Perineum Anterior - pubic symphysis (PS) Posterior - coccyx (C) Lateral - ischial tuberosities (IT) Anterolateral - ischiopubic ramus (IPR) Posterolateral - sacrotuberous ligament

Cutaneous supply : 

Cutaneous supply Dorsal nerve of penis Ilioinguinal n. and genital br. of genitofemoral n. Perineal branch of post. Cut. N. of thigh Post.scrotal(labial) n. Perineal br. of pud. N.

Male Urogenital Triangle : 

Male Urogenital Triangle Fascia is firmly attached to the IPR along the side of the UG triangle and to the posterior free margin of the urogenital diaphragm.

Superficial perineal space : 

Superficial perineal space Root of penis Muscles – ischiocavernosus, bulbospongiosus, sup. trans. Perineii Perineal body Br. of perineal nerve Long perineal n. Br. of perineal A. Duct of B-U gland

Boundaries of superficial perineal space : 

Boundaries of superficial perineal space Superficial- Colle’s fascia Deep- Perineal membrane On either side- Ischiopubic rami Ant- Open and continues with the spaces of scrotum and ant. Abd. Wall. Post- Closed by union of the perineal membrane with the colle’s fascia.

Perineal membrane : 

Perineal membrane Thick triangular sheet of fascia lying across pubic arch. Base is continuous- Above-sup. Fascia of UGD Below- Colle’s fascia Midline- Perineal body On each side- IPR Ant(apex)- sup. Fascia of UGD.

Structures piercing perineal membrane : 

Structures piercing perineal membrane Urethra, 1 inch below the pubic symphysis Ducts of bulbourethral glands, close to urethra. A. and N. to bulb of penis. Urethral A. Deep A. of penis. Dorsal A. of penis Post. Scrotal N.s and vessels Br.s of perineal nerve.

Deep perineal pouch : 

Deep perineal pouch b/w sup. & inf. Fascia of UGD. Contents : Deep transverse perineus muscle Urethral sphincter Bulbo-urethral gland (Cowper's gland) Terminal branches of the internal pudendal artery to the bulb of the penis as well as the deep artery of the penis.

Female Urogenital Triangle : 

Female Urogenital Triangle

Female Urogenital Triangle : 

Female Urogenital Triangle After Colles' fascia is removed, identify the structures in the superficial perineal space ischiocavernosus muscle overlying the crus of the clitoris bulbospongiosus muscle overlying the bulb of the vestibule perineal body (central tendon) urethral opening vaginal opening

Structures piercing perineal membrane : 

Structures piercing perineal membrane Urethra Vagina A. and N. to bulb of the vestibule Deep A. of clitoris Dorsal A. of clitoris Post. labial N.s and vessels Br.s of perineal nerve.

Deep perineal space : 

Deep perineal space b/w sup. & inf. Fascia of UGD. CONTENTS: Urethra with sphincter Dorsal nerve of clitoris Muscular br. Of pudendal n. crus of the clitoris bulb of the vestibule greater vestibular gland (deep to the bulb)

PERINEAL BODY(central tendon of perineum) : 

PERINEAL BODY(central tendon of perineum) Pyramidal fibromuscular mass in the mid-line of the perineum at the junction between the urogenital triangle and the anal triangle. In males, it is found between the bulb of penis and the anus. In females, is found between the vagina and anus.

ATTACHMENTS : 

ATTACHMENTS External anal sphincter. Bulbospongiosus. Superficial transverse perineal muscle. Anterior fibers of the levator ani. Fibers from external urinary sphincter. Deep transverse perineal muscle.

STRUCTURES CUT WHILE ENTERING PELVIC CAVITY THRU PERINEUM : 

STRUCTURES CUT WHILE ENTERING PELVIC CAVITY THRU PERINEUM skin fatty superficial fascia (Camper's layer) membranous fascia (Scarpa's layer or Colles' fascia in perineum) superficial perineal space inferior fascia of urogenital diaphragm deep transverse perineus muscle superior fascia of urogenital diaphragm anterior extension of ischiorectal fossa inferior fascia of levator ani levator ani superior fascia of levator ani pelvic fascia peritoneum pelvic cavity

refrences : 

refrences Prof. NAFIS AHMAD FARUQI & Prof. AIJAZ AHMED KHAN, Manual of Practical Anatomy VOLUME II (Thorax and Abdomen) http://en.wikipedia.org/wiki/Deep_perineal_pouch http://download.videohelp.com/vitualis/med/urogenital_diaphragm_ischiorectal_fossa.htm http://www.innerbody.com/image_dige04/musc34.html http://images.google.co.in/images?hl=en&q=UROGENITAL+DIAPHRAGM&um=1&ie=UTF-8&ei=4rcJSuC-MajW6gP0o-isCQ&sa=X&oi=image_result_group&resnum=4&ct=title http://www.answers.com/topic/urogenital-diaphragm http://medical-dictionary.thefreedictionary.com/urogenital+diaphragm Snell’s clinical anatomy

Slide 21: 

Thanks to all

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