pelvis + perineum -...
TRANSCRIPT
![Page 1: Pelvis + Perineum - anatomy.plcnet.organatomy.plcnet.org/files/Lectures/English_1_2/2018/PelvisPerineum2011.pdf · Ovarian Inferior mesenteric Superior mesenteric Superior rectal](https://reader031.vdocument.in/reader031/viewer/2022021812/5e13ce3ce6ec44729e400cb5/html5/thumbnails/1.jpg)
Pelvis + Perineum
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Pelvic Cavity
Enclosed by bony, ligamentous and
muscular wall
Contains the urinary bladder, ureters,
pelvic genital organs, rectum, blood
vessels, lymphatics and nerves
Pelvic inlet (superior pelvic aperture)
Pelvic outlet (inferior pelvic aperture)
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Superior Apeture
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Inferior Pelvic Border
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Lesser (True) Pelvis (pelvis minor)
Location of pelvic viscera – the urinary
bladder and reproductive organs such as
the uterus and ovaries
Bounded by the hip bones, sacrum, and
coccyx
Limited inferiorly by the musculofascial
pelvic diaphragm
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Pelvic Walls and Floors
Anterior pelvic wall – is formed
primarily by the bodies and rami of the
pubic bones and the pubic symphysis
Lateral pelvic walls – formed by the hip
bones and the obturator internus
muscles
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Anterior Pelvic Wall
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Pelvic Walls and Floor
Posterior Pelvic Wall – formed by the
sacrum and coccyx, adjacent parts of the
ilia, and the S-I joints; piriformis muscle
covers the area
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Posterior Pelvic Wall
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Pelvic Floor
Formed by the funnel shaped pelvic
diaphragm – consists of the levator ani
and coccygeus muscles and their fascia
Stretches between the pubis anteriorly
and the coccyx posteriorly and from one
lateral pelvic wall to the other
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Levator Ani
Three parts – the pubococcygeus, the puborectalis and the iliococcygeus.
Collectively they run from the body of the pubis, the tendinous arch of the obturator fascia and the ischial spine TO the perineal body, the coccyx, the anococcygeal ligament, the walls of the prostate or vagina, the rectum and the anal canal
Innervated by the nerve to levator ani from S4 and the inferior anal (rectal) nerve (from S2-S4) and the coccygeal plexus
Supports the pelvic viscera; raise the pelvic floor and assist the abdominal muscles in forced expiration activities
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Coccygeus Muscle
Forms a small part of the pelvic
diaphragm that supports the pelvic
viscera, flexes the coccyx
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Pelvic Diaphragm
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Pelvic Floor - Male
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Pelvic Floor - Female
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Perineal Body
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Viscera
Urinary organs in the pelvis
Ureters – muscular (smooth) tubes
running from kidneys to bladder 25 to 30
cm long
Bladder – a hollow container surrounded
by a strong smooth muscular wall
Temporary reservoir for urine
Apex, Body, Fundus, Neck, Uvula
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2. Identify the normal position and
anatomical relationships of the pelvic
viscera
Anteverted Anteflexed
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Peritoneum
1. In males
From the abdominal wall covers the superior and part of the posterior surface of the urinary bladder and superior tips of the seminal vesicles.
Rectovesicular pouch between the bladder and the rectum
• the most inferior extent of the peritoneum in the male.
Attaches to the anterior aspect of the rectum.
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Peritoneum
2. In females
Forms vesicouterine pouch between the bladder and the uterus,
Deeper rectouterine pouch between the rectum and the uterus.
• the rectouterine pouch is the most inferior extent of the peritoneum.
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Peritoneal reflections and their relationship to the pelvic contents.
•Most pelvic organs are subperitoneal
Subperitoneal
space
Rectovesicle pouch Vesicouterine pouch Rectouterine pouch
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Fascia of the pelvis
1. Visceral fascia:
covers organs, binds the pelvic viscera to each other and to the parietal fascia
2. Parietal fascia:
covers the pelvic surfaces of muscles and lines the pelvic cavity
a. superior parietal fascia is thickened at the neck of the urinary bladder to form the pubovesicular ligament (female) and the puboprostatic ligament (male),
b. anchors neck of urinary bladder to the pubis.
c. pubovesicular ligament in females, attaches to the vagina as well.
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Ligaments supporting pelvic organs
Peritoneal ligaments
Broad ligament
Fundus
Round lig. of uterus
Bladder
Uterine tube
Lig. Of ovary
Suspensory lig.
Lig. Of the ovary
Round
ligament
of the
uterus
Fundus
Body
Cervix
Uterine art.
Ovarian art. Uterine tube
Mesosalpinx
Lig. Of the ovary
Round lig.
of the
uterus
Mesometrium
Ureter
Uterine art.
Pelvic visceral ligaments
Bladder
Pubocervical lig.
Transverse
cervical lig. Cervix
Sacrocervical lig.
Rectum
Bladder
Pubocervical lig. Transverse cervical lig.
Rectum Pelvic diaphragm
Sacrocervical lig.
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Spaces within the fascia
Retropubic space:
fascial plane between bladder and pubic symphysis which allows for expansion of the bladder and access to the bladder and the prostate without entering the peritoneal cavity.
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Blood supply of the pelvis
Rules:
1. All pelvic organs are supplied by branches of the internal iliac artery except the
ovaries and the upper third of the rectum.
2. Venous drainage follows the arterial supply, including the portal tributary, the inferior
mesenteric vein.
3. Portal caval anastomses are found at the inferior rectal veins.
Celiac
Inferior mesenteric Ovarian
Superior mesenteric
Superior rectal
Testicular
Common iliac
Ext. iliac
Int. iliac
Median
Sacral
Femoral
Inguinal
ligament
Renal
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Lymphatic drainage of pelvis and perienum
Rules:
• Lymphatics drain
toward lymph nodes
along internal iliac
veins, except for the
ovary (para-aortic
nodes), and superior
portion of the rectum
(inferior mesenteric
nodes)
• Perineum drains to
superficial inguinal
nodes
Para-aortic
External iliac
Internal iliac
Superficial Inguinal
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Nerve supply of Pelvic Organs
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Perineum
Inferior to the pelvic outlet and separated from the pelvic cavity by the pelvic diaphragm (Levator ani and coccygeus muscles)
Bounded by
• pubic symphysis anteriorly;
• inferior pubic and ischial rami anterolaterally;
• ischial tuberosity laterally;
• sacrotuberous ligament posterolaterally;
• sacrum and coccyx posteriorly
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Perineum
Two Triangles • Anal triangle (posterior) contains the anus
• Urogenital triangle (anterior) contains the root of the scrotum and penis in males or the external genitalia in females
The perineal membrane stretches between the two sides of the pubic arch and covers the anterior part of the outlet
The perineal body is an irregular fibromuscular mass located between the anal canal and the perineal membrane
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Triangles
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Perineal Membrane
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Perineal Body
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Perineum-Female
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Perineum - Male
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Perineum
Muscles
Bulbospongiosus • Females – O. central tendon of perineum, I. dorsum of
clitoris, urogenital diaphragm;
• Males – O. central tendon of perineum and bulb of penis; I. root of penis;
• A: compress vagina orifice / urethra;
• N: perineal nerve, pudenal nerve
Ischiocavernosus • O. ramus of ischium, I. near pubic symphysis;
• F: maintains erection of penis or clitoris
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Muscles
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Perineum
Muscles
External anal sphincter (skeletal muscle) N: Inferior Anal Nerve (S2-S4)
– inhibits voiding
Internal Anal Sphincter – smooth muscle sympathetic supply (S2,S3,S4) – inhibits voiding
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Superficial Transverse Perineal
O: Ischial tuberosity
I: Perineal body
A: Support perineal body
N: Pudenal nerve
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External Urethral
Sphincter
O: Ischial tuberosity
I: surround urethra
A: compress urethra to maintain urine
continence
N: Pudenal (S2-S4)
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Deep Transverse
Perineal
O: Medial Aspect of Ischial Ramus
I: Pineal Body
A: Stabilizes position of the perineal body
N: Pudenal N (S2-S4)
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Ischianal fossa - male
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Pudendal canal
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Pudendal canal & content