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The fallopian tube (TA: tuba uterina 8), also known as the uterine tube or, less commonly, the oviduct, is a paired hollow tube that bridges the ovary and uterus and functions to convey the mature ovum from the former to the latter. If conception occurs, it usually does so within the tube, which can be affected by a wide range of pathology.
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The fallopian tube is approximately 10-12 cm long and 1-4 mm in diameter. It bridges the gap between the ovary laterally and the uterus medially. Through it, the ovum passes into the uterine cavity. The peritoneal reflection draping over the salpinges forms the mesosalpinx.
The fallopian tube can be divided into five anatomic segments (from lateral to medial, through the path of an ovum after ovulation):
fimbriae: ~25 finger-like projections that drape over the ovary
the ovarian fimbriae are longer than the others and are attached to the tubal pole of the ovary
infundibulum: a funnel-shaped lateral part that drapes over the ovary with the fimbriae emanating from it
it opens into the peritoneal cavity at the abdominal ostium
ampulla: the widest and longest section, forming over half the length, it is the most established location of fertilisation
isthmus: immediately lateral to the uterus, it is the narrowest segment, as its name suggests
interstitial or intramural segment: the section within the myometrium
See mnemonic here.
The extrauterine part of the fallopian tube courses between the two folds of the broad ligament at its superior aspect 5.
at its medial end, the interstitial segment is continuous with the uterotubal junction, a continuation of the endometrial cavity
at its lateral end, the infundibulum opens into the peritoneal cavity
The fallopian tubes are one of the components of the adnexa.
tubal branch of the ovarian artery (lateral one-third) and terminal (tubal) branch of the uterine artery (medial two-thirds)
lateral one-third via the pampiniform plexus to the ovarian veins
medial two-thirds via the uterine plexus to the internal iliac vein
via ovarian vessels to the para-aortic nodes and uterine vessels to the internal iliac chain
some drainage also to the inguinal nodes via the round ligament
autonomic supply from the ovarian and uterine plexuses
parasympathetic: vagus for the lateral half, pelvic splanchnic nerves to the medial half
sympathetic: thoracic and lumbar spinal segments (T10- L1)
abnormal entry into uterine body or fundus
Like many other muscular hollow tubes, it has two layers of muscle (inner circular, outer longitudinal) and is lined by a mixture of ciliated and non-ciliated columnar epithelium. It is the former that pushes the ovum towards the uterus.
The normal fallopian tube is not visualized at cross-sectional imaging unless it is outlined by fluid. In the presence of peritoneal fluid or contrast material, the fallopian tubes appear as paired, thin, serpentine juxtauterine structures extending either anteriorly or posteriorly into the cul-de-sac.
Contrast studies can be completed by performing a hysterosalpingogram (HSG).
History and etymology
The fallopian tube is named after Gabriel Fallopio (1523-1562), an Italian anatomist. He is the same anatomist who gave his name to the fallopian ligament and the fallopian canal. Despite the eponym, the word "fallopian" is usually rendered in lowercase as it is an adjectival form derived from a name, not the name itself (cf. nabothian) 9,10.
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