pelvis and peruneum Flashcards

1
Q

what is the bony pelvis

A

the 2 pelvic bones and the sacrum

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2
Q

what is the shallow basin

A

it is formed from the 2 iliac fossae and is technically part of the abdomen

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3
Q

what is the pelvic cavity

A

the region between the pelvic inlet and outlet
short and cylindrical in women
elongated and tapered in men

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4
Q

organs in the pelvic cavity

A
urinary bladder
prostate gland 
uterus
cervix 
upper vagina 
rectum
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5
Q

what is the pelvic floor

A

sheet of muscle
pelvic diaphragm
formed by the levator ani muscle

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6
Q

describe the urinary bladder

A

tetrahedral
superior surface is covered in perineum
inferolateral walls contact muscles of pelvic wall and pelvic diaphragm
posterior surface contacts the seminal vesicles and rectum (male) and superior part of the vagina (female)
ureter enter at postero-superior corners
urether leaves through inferior corner - thick sm = vesical sphincter

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7
Q

where does the bladder go when full

A

expands into the loose fascia, between peritoneaum and the transversalis fascia of anterior abdominal wall

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8
Q

describe the prostate gland

A

surrounds the part of the male urethra
secretes into the urethra through many openings
contains sm - contract in orgasm to pump secretion in urethra
this is emission -> contraction of skeletal muscle arund penile urethra = ejaculation

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9
Q

describe the seminal vesicles

A

lie on the posterior surface of bladder
each has a duct that opens into ductus deferebs below dilated ampulla
combined duct on each side passes through the postrate to the urethra

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10
Q

describe the uterus

A

receives 2 uuterine tubes at upper cornrs through anterior wall of the vagina
domed upper portion above tubes is fundus
main part =- body
thick, fibromuscular cylinderacal part is projecting vagina = cervix
uterus has thick wall of sm - myometrium, lined by mucosa wiuth glandular epithelium - enbdometrium

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11
Q

describe the cervical canal

A

contains mucus secreting glands lined by the columnar epithelium
vaginal surface of cervix us covered by stratified squamous non-kertiinised epi - enterocervix

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12
Q

attachments of the cervix

A

it attachhes to the bony wall of the pelvis through strong bands of pelvic fascia - cervical (parametriial) ligaments
hold cervix in place in childbirth - prevent being pushed down through the vagina
if these fail - prolapse

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13
Q

describe the uterine tubes

A

open into peritoneal cavity close to the ovaries
the mouth - infundibulum is surrounded by tentacles called fimbriae
tubes open into thin walled ampulla followed by thicker isthmus

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14
Q

describe the broad ligament

A

fold of mesentery
switch from 1 side of pelvic cavity to another
where uterus lies
ovarian and uterine bv lie in thus

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15
Q

describe the rectum

A

serpentine tube
following the anterior surface of the lower sacrum
concave forward - has 2 bends - one to thr R and one to the L

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16
Q

where are the ovaries

A

in a subsidiary peritoneal fold

ovarian ligament on posterior surface of broad ligament just below infundibulum of uterine tube

17
Q

describe the internal iliac arteries

A

supply blood to the pelvic walls and organs
not the gonads - they are high in the abdomen - supplied by ovarian/testicular arteries
rectum - blood from superior rectal artery - brance of inferior mesenteric, and middle and inferior rectal arteries - branch from internal iliac
in foetus umbilical arteries arise from the superior vesical branches of the internal iliac

18
Q

umbilical arteries in adults

A

remain as medial umbilical ligaments

19
Q

describe the venous drainage of the pelvis

A

internal iliac veins - main

within the pelvic fascia the veins form an elaborate plexus

20
Q

describe venous drainage of the rectum

A

reflects the arterial supply
rectal veins are important portal-systemic anastomosis
dilation of the rectal veins is piles

21
Q

lymph drainage of the pelvic organs

A

into external and internal iliac nodes

gonads directly into the pre-aortic nodes of upper abdomen

22
Q

lymph drainage from the perineum

A

pass to superficial inguinal nodes in groin

23
Q

describe the perineum

A

lies inferior to pelvic diaphragm

divided into anterior (urogenital) triangle containing opening of urethra and vagina and its opening

24
Q

what is the ishioanal fossa

A

in the anal triangle
space between the pelvic diaphragm and lateral wall of pelvis on both sides is filled with fat
allows expansion of the anal canal and the vagina
may become the site of abcesses if infection spreads into it from lesions of the anal canal

25
Q

inferior rectal vessels

A

may be cut if episiotomy is carelessly placed in birth

these vessels and nerves arise from pudendal canal

26
Q

the pedendal canal

A

fibrous sheath on the lateral wall of fossa wothin which the pudenal nerve and internal pudendal vessels run forward from the posterior pelvis to anterior perineum

27
Q

describe the anterior triangle of the perineum

A

has deeply placed fibrous region containing the urethral sphincter
superficially - superficial perineal pouch containing erectile tissue masses of the penis or of the clitoris and vestibular bulbs - surrounded by skeletal muscle, contract in an orgasm
female urethra and vagina open into space called vestibule lying between labia minora

28
Q

describe the labia minora

A

the anterior ends form a prepuce around the galds of the clitoris
on either side are the labia majora

29
Q

libia minora and majora in males

A

main differences:
size
minora are fused to extend the urethra to the tip of the glans
majora are fused to form the scrotal sac