Week 4 - F - Anatomy 5 - Anatomy of Urinary Incontinence and Prolapse Flashcards
What does the pelvic floor separate? What does it play an important role in?
The pelvic floor separates the pelvic cavity from the perineum The pelvic floor plays an important role in: * Providing support to the pelvic organs * Maintaining urinary and faecal continence
What are the three layers that make up the pelvic floor? (deepest to most superficial)
Pelvic diaphragm Muscles of perineal pouches - have a deep and superficial perineal pouch Perineal membrane
There is a superficial and deep perineal pouch Which pouch forms part of the pelvic floor?
The deep perineal pouch forms part of the pelvic floor (2nd layer)
The pelvic diaphragm is the deepest layer of the pelvic floor What are the two muscle groups which make up the pelvic diaphragm? (some books may say pelvic floor and diaphragm are the same but pelvic floor technically has the muscles of perineal pouches and the perineal membrane)
Two muscle groups The two muscle groups are the levator ani and the coccygeus
What appearance does the pelvic diaphragm have? - this is the layer consisting of levator ani and coccygeus
The pelvic diaphragm has a sling like appearance
Deepest layer of pelvic floor- generally known as levator ani but actually two muscle groups here. Anterior aspect- levator ani. Little part at the back is called coccygeus muscle. Pretty much lies over the sacrospinous ligament- What are the attachments of the coccygeus muscle? What is the anterior gap in the musculature of the levator aani known as? What passes through here?
Coccygeus - basically runs over the sacrospinous ligament Attaches from the ischial spine and comes back towards the sacrum/coccyx The anterior gap in the musculature of the levator ani is the urogenital hiatus - the urethra, dorsal vein of clitoris/penis and vagina pass here
The levator ani forms the majority of the pelvic diaphargm What three muscles make up the levator ani?
Puborectalis Pubococcygeus Iliococcygues
What is the most medial muscle of the levator ani? What is the gap between the anteromedial borders of the levator ani and what passes through here?
The most medial muscle of the levator ani is the puborectalis
The gap between the antero medial borders of the puborectalis is the urogenital hiatus
Urethra, dorsal vein of clitoris/penis and in women, the vagina pass through the urogenital hiatus
What is the nerve supply to the levator ani? What are the nerve roots?
Nerve to the levator ani - S3,4 Pudendal nerve - S2,3,4 Levator ani has a dual nerve supply
What are the different attachments of the muscles of the levator ani?
Puborectalis - attaches to pubic bone and forms a sling around the rectum Pubococcygeus - thinner and wider running from pubic bone back towards coccyx Iliococcygeus - runs from ilium to coccyx All three sling round - sort of crescent shaped
The levator ani is tonically contracted What must happen to allow for urination / defecation?
To allow for urination / defection, the muscles of the levator ani must relax Can see how the obturator internus muscle lies over the obturator foramen (obturator membrane is superficial to the muscle) and there is a small opening known as the obturator canal
A lot of additional support to the muscles is the endopelvic fascia. Main job is providing areas for expansion e.g. when the bladder is filling up- it expands into here. What are the ligaments running close to the endopelvic fascia which provide additional support to the pelvic organs?
The uteroscaral ligament The tendinous arch of the pelvic fascia The tendinous arch of the levator ani The ligament of the bladder These ligaments are formed from fibrous parts of endopelic fascia that have started to condense forming ligaments
One of the ligaments not shown on the previous diagram is the transverse cervical ligament which is located at the base of the broad liggament of the uterus WHat is the transverse cervical ligament also known as?
The transverse cervical ligament is also known as the cardinal ligament
WHat is the middle layer of the pelvic floor? What is found in this layer?
Ths is the deep perineal pouch containing: * Dorsal vein of the clitoris/penis * Part of the vagina in females * Part of the urethra * External urethral sphincter & compressor urathrae * Deep transverse perineal muscle * Extensions of the ischioanal fat pads & muscles:
What is the slight difference between the deep transverse perineal muscle in males and females? What is the function of the compressor urathrae and the external urethral sphincter?
Deep transverse perineal muscles in females is smooth muscle and involuntary In males this muscle is skeletal and voluntary The compressor urethrae wraps around the external urethral sphincter - when both contract, the lumen of the urethra closes
What is located in the deep perineal pouch in males around the deep transverse perineal muscle that lubricates the urethra? WHere is this located in females?
This is the Bulbourethral glands (Cowper’s gland) In females it is known as Bartholin’s gland located in the superficial pernieal pouch - lteral vagina/labia minora Also known as greater vestibular gland in females
What is the final layer of the pelvic floor? Most superficial What are its attachments?
This is the perineal membrane It attaches laterally to the sides of the pubic arch closing the urogenital triangle