Session 5 - Group Work Flashcards
The uterine tubes lie in the free edge of which ligament?
Broad
List the mechanisms, which facilitate movement of an ovum along the duct?
Cilia and smooth muscle contraction (peristalsis)
Explain how infection may spread to the peritoneum from the female reproductive
tract
The opening of the uterine tube at the infundibulum into the peritoneal cavity allows infection
such as gonorrhea to spread from the vagina and cervix, via the uterus and uterine tubes
into the peritoneal cavity.
What may be the consequence of infection in the uterine tubes?
Adhesions, which do not allow an ovum to pass through to the uterus. Hence, this may
cause infertility or an ectopic pregnancy.
List two common and two very rare sites of implantation of an ectopic pregnancy.
Common: fimbrial, ampullary, isthmic or interstitial (of the uterine tubes); ovary Rare: Pouch of Douglas, abdominal viscera
Where would pain be felt with an ectopic pregnancy implanted in the ampulla of the
uterine tubes? Explain why pain may be felt at the shoulder tip following rupture of an
ectopic pregnancy?
Pain from an ectopic pregnancy is felt in the lower abdominal quadrants
If lying down blood in the peritoneal cavity may collect beneath the diaphragm irritating the
phrenic nerve. Since this nerve originates with cutaneous nerves from C3, 4 and 5, pain may
be referred to the dermatomes for these segments; i.e. shoulders. Pain felt in the lower
quadrants is due to stretching and tearing of the peritoneum.
Blood passing from the vagina is usually withdrawal bleeding (not a result of bleeding at the
site of the rupture), caused by reduction in the hormone hCG which maintains the corpus
luteum and hence prepares the endometrium for implantation.
A ruptured ectopic pregnancy at this site may cause a dangerous haemorrhage.
Describe the arterial blood supply to the uterine tubes?
It is an anastomotic system of the ovarian and uterine arteries.
The lateral reflection of the peritoneum off the body of the uterus forms which
ligament?
Broad ligaments (which also contain uterine vessels)
The broad ligament may be subdivided. The mesentery of uterus is also called the
mesometrium. The mesosalpinx is mesentery of the uterine tube, whilst the mesovarium is
that part of the broad ligament that suspends the ovary.
Histologically, what are the three layers of the uterus and which of these layers is
shed during menstruation?
Perimetrium (outer)
Myometrium (consisting of three muscle layers)
Endometrium (inner) (consisting of the stratum functionalis - shed during menstruation) and
the stratum basalis (which produces new stratum functionalis after each menstruation)
The endometrial lining of the uterus is of which type of epithelial cells?
Simple columnar epithelium (either are ciliated or have microvilli) with glycogen producing
glands changing from simple to highly coiled over the course of the uterine cycle.
How does this compare to the cervical canal epithelium?
Tall columnar cells, with branched glandular cells, which form an alkaline mucus.
How does the epithelium of the body of the uterus change during the menstrual
cycle?
menses days 1 – 4 : desquamation of 2/3, bleeding
days 5 – 7 : rapid re-growth from remaining epithelial cells
days 7 – 14 : endometrial re-growth is completed
This concludes the proliferative phase
days 14 – 28 : Secretary phase includes endometrial thickening, enlargement of
glandular cells, oedematous, proliferation of white cells.
3 layers : compact superficial zone spongy middle zone (glandules) inactive
basal layer
As menses approach the arteries go in to spasm, retracting back to the deeper layers
evoking ischaemia.
Explain why the ureter is in danger of being damaged during hysterectomy.
In clamping off the uterine artery, the ureter may be accidentally damaged (remember :
water (urine) under the (arterial) bridge).
List the lymphatic drainage of the following structures.
Fundus of uterus - aortic nodes (lesser to inguinal lymph nodes)
Body of uterus - external iliac nodes
Cervix - external and internal iliac nodes, sacral nodes.
In what position does the uterus usually lie ?
anteverted and anteflexed