Test 3 Flashcards
Paired, almond-shaped structures situated on each
side of the uterus
ovaries
normal ovary measurements
Length: 2.0-5.0 cm
Average size: 3.0 x 1.5 cm
post menopausal ovary measurements
Length: 1.2-1.4 cm
Ovaries
VOLUME=
(Length X Width X Height) X .523
Ovarian Volume:
Premenopausal/ adolescent/ pregnant women
Not including any lesion
< 6cc but not more than
20cc
critical to know especially to rule out torsion
Ovarian Volume:
Post-menopausal
About 2cc, more than 8cc is
considered abnormal
How to get volume of ovaries with a cyst?
subtract cyst volume from ovarian volume
Location of ovaries
midline anteflexed uterus
ovaries are usually positioned lateral or posteriolateral to the uterus
Location of ovaries
Retroverted uterus:
Ovaries are usually positioned laterally and
superior to the uterine fundus.
2 regions of the ovary
cortex
medulla
region of ovary that contains follicles with oocytes
cortex
region of ovary that contains rich vascular bed, lymphatic vessels and nerve fibers within a loose connective tissue
medulla
outermost layer of ovary
germinal epithelium
(dense connective
layer) lies under epithelium
Tunica albuginea
4 ovary support structures
- Ovarian Ligaments
2.Suspensory
3.Broad
4.Mesovarian
____________ anchors the ovary medially to the uterus
ovarian ligament
- a peritoneal fold that “tents” over the uterus.
- Extends from the lateral aspect of the uterus to
the lateral pelvic sidewalls - contains the fallopian tube
broad ligament
The portion of the ligament that
extends from the infundibulum of the fallopian tube and upper pole of the ovary to the pelvic sidewall is called the _________
suspensory ligament
The __________ ligaments contain the ovarian vessels, lymphatics, and
nerves and is sometimes subject to twisting which results in ovarian torsion.
suspensory
The ovary is attached to the posterior layer of the broad ligament by the ________________
mesovarium
The __________ ligaments may be identified sonographically when they are outlined by free intrapertioneal fluid (ascites)
broad
The ________________________ ligaments
cannot be seen sonographically.
mesovarium and round
The ________________- ligament is also not seen
however, on occasion, the ovarian artery
within the ligament may be seen during
a transvaginal scan
suspensory
blood supple to ovaries
1
2
ovarian arteries
uterine arteries
The blood vessels reach the ovaries by
traveling through the ______________
ligaments.
suspensory
- Common Iliac arteries - course
anteriorly and medial to the psoas
muscles; bifurcates at the level of the
L5-S1 disk
– External iliac arteries-course along pelvic
brim and become the common femoral
arteries.
– Internal iliac arteries
Supply blood to the pelvic
visera.
Internal Iliac artery divides into ___________ and _________
anterior and posterior branch
What does the anterior branch of the internal iliac artery supply blood to?
pelvic viscera
What does the posterior branch of the internal iliac artery supply blood to?
body wall and thigh
Uterine Artery
- runs anterior on levator ani to
cervix - crosses ureter
- ascends lateral to the uterus in
the broad ligament to the
junction of the fallopian tubes
and uterus - courses laterally and joins
with ovarian artery - branches anastomose
extensively across midline
(usually a high velocity, high
resistance flow
Which artery????
-Arise from the lateral margin of the
aorta, slightly inferior to the renal
arteries
-Cross external iliac artery and courses
medially within suspensory ligament
of ovary
Ovarian artery
Where does the RT ovarian vein empty into???
into IVC just below renal vein
Where does the LT ovarian vein empty into?
left renal vein
Which vein makes up 80-90% of the OVT cases???
affected, commonly 2-15 days following delivery.
right ovarian vein
LYMPHATICS OF PELVIS
- Common iliac - accompany artery
- External iliac - accompany artery and vein
- Internal iliac - surround internal iliac
vessels
Onset of menstruation is called _________
menarche
Pain with ovulation is called ________________
meaning “middle pain”
mittelschmerz
3 phases of ovulatory cycle
3 phases:
1. Follicular Phase (before ovulation)- Days 1-13
Corresponds to proliferative endometrial stage
2. Ovulation- Day 14
3. Luteal Phase (after ovulation)- Days 15-28
Corresponds to secretory phase of endometrium
Days 1-13 of ovulatory cycle is which phase?
follicular phase (before ovulation)
Corresponds to proliferative endometrial stage
Day 14 of the ovulatory cycle is which phase?
ovulation
Day 15-28 of the ovulatory cycle is which phase?
Luteal phase (after ovulation
Corresponds to secretory phase of endometrium
Ovulatory Cycle is Influenced by gonadotrophins from the ____________
hypothalamus
What size does the dominant follicle reach by day 10 while the others regress?
2.0 - 2.5 cm
This dominant or mature follicle is called
a ____________
Graafian follicle
The other activated follicles that regress
are called _________
atretic
Which hormone surges around day 14 and causes the Graafian follicle to rupture and ovulation has occured?
luteinizing hormone
Following ovulation the granulosa cells of the
follicle are transformed into ______________ cells.
- This enables the corpus luteum to produce
progesterone.
secretory
A corpus lutem degenerates into a ____________ if fertilization doesn’t take place
corpus albicans
Gonadotropin releasing hormone (GnRH) (secreted by the hypothalamus) stimulates the anterior pituitary gland to release Follicular stimulating hormone(Day 1)
Follicular Stimulating Hormone (FSH) (secreted by anterior pituitary gland) Initiates follicle growth
Follicles generate estrogen, this also allows repair of endometrium
Day 10 estrogen reaches high levels and Peak around days 12-13.
Estrogen surge triggers the pituitary gland to release luteinizing hormone (day 13-14)
Within 24-36 hours of surge ovulation occurs (Day 14)
Corpus luteum then produces estrogen and progesterone (day 14-28)
Estrogen and progesterone stimulate endometrium to thicken
No pregnancy, corpus luteum degenerates and mensus occurs
The drop in estrogen and progestrone trigger the hypothalamus to start the process again
If pregnany occurs the hormone human chorionic gonadotropin (hcG) prevents ovulation and keeps the corpus luteum producing progestrone
The progestrone, in turn, keeps the pregnancy developing until the
placenta develops
Gonadotropin releasing hormone -> follicular stimulation hormone -> estrogen -> luteinizing hormone -> estrogen and progesterone
what order does ovaries ovulate it?
they rotate. left one this month, right one next month etc
corpus luteum vs corpus albicans appearance
corpus luteum appears small hypoechoic to
isoechoic structures.
* If the ovum is not fertilized, the degenerating
corpus luteum eventually sinks into the
stroma of the ovary as a white scar or corpus
albicans.
-Produced normally by the fallopian tubes, endometrium and peritoneal lining
-Tumor marker
-Protein released by ovarian tumors
-Levels don’t usually rise until cancer is in advanced stage.
-May miss approximately ½ of early tumors
-Higher level – more likely ovarian cancer
CA 125