The uterine tubes, also known together oviducts or fallopian tubes, room the female structures that deliver the ova indigenous the ovary to the uterus every month. In the presence of sperm and fertilization, the uterine tubes carry the fertilized egg come the uterus because that implantation.

You are watching: Fertilization usually occurs in the uterus

Gross anatomy

The uterine tubes are uterine appendages located bilaterally at the superior part of the uterine cavity. These tubes departure the uterus v an area referred to as the cornua, creating a connection in between the endometrial and also peritoneal cavities. Every uterine pipe is around 10 cm in length and 1 cm in diameter and is positioned within the mesosalpinx. The mesosalpinx is a wrinkles in the large ligament. The distal portion of the uterine tube ends in one orientation encircling the ovary. The primary function of the uterine tubes is to carry sperm towards the egg, which is released by the ovary, and to then permit passage the the fertilized egg ago to the uterus because that implantation. <1>


A uterine tube contains 3 parts. The an initial segment, closest come the uterus, is referred to as the isthmus. The 2nd segment is the ampulla, i m sorry becomes more dilated in diameter and is the most usual site because that fertilization. The final segment, located farthest from the uterus, is the infundibulum. The infundibulum offers rise come the fimbriae, fingerlike projections that space responsible because that picking up the egg released by the ovary.


The arterial it is provided to the uterine pipe is indigenous branches the the uterine and also ovarian arteries; these tiny vessels are situated within the mesosalpinx.

The nerve supply to the uterine tube is via both sympathetic and parasympathetic fibers. Sensory fibers run from thoracic segment 11-12 (T11-T12) and also lumbar segment 1 (L1).


Microscopic anatomy

Histologically, the uterine tubes room composed the 3 layers—the mucosa, muscularis, and also serosa. The 3 various cell types within the mucosa that the uterine tubes include the columnar ciliated epithelial cell (25%), secretory cells (60%), and also narrow peg cells ( <5>




Females through salpingitis or tubo-ovarian abscess usually existing with fever and also acute start of abdominal pain. The uterine tube in a patient with tubo-ovarian abscess frequently has pus in ~ its walls (pyosalpinx). The diagnosis is made through ultrasonography, activities studies, and culture of the cervix or operation specimen, if applicable.


Salpingitis and tubo-ovarian abscess space treated v intravenous antibiotics come cover typical organisms that may have caused the ascending infection. Treatment is began before culture results room finalized. The score of treatment is to resolve the symptoms and also to keep tubal function. (See likewise Pelvic Inflammatory an illness Empiric Therapy and Pelvic Inflammatory disease Organism-Specific Therapy.) surgical treatment to remove the uterine tube is warranted in some cases, depending upon the severity the infection.


Sequelae of this infections include infertility, chronic pain, and also increased threat for ectopic pregnancy.


Hydrosalpinx

Hydrosalpinx occurs as an finish stage the pyosalpinx, a disorder characterized by pus within the uterine tube. <6> Hydrosalpinx is the repertoire of sterile liquid within the tube an additional to occlusion that the pipe (see above).


Ectopic pregnancy

Ectopic pregnancy is resulted in by a fertilized ovum implanting either within the uterine tube or all over other 보다 the endometrial cavity. In the circumstance of a tubal ectopic pregnancy, the lamina propria reacts choose the endometrium and forms countless decidual cells. <6, 7>


Because the lumen the the uterine pipe is small, it can not contain a growing pregnancy. When the embryo or fetus becomes huge enough, it can rupture with the wall surface of the uterine tube, ending up being a clinical emergency. Immediate surgical intervention is essential in this situation. If only one of the uterine tube is removed, it is still feasible for pregnant to occur on the contrary side.


If the ectopic pregnant is recognize on ultrasonography before it becomes as well advanced, clinical treatment v methotrexate may be offered in part cases.

See more: How To Knit Front And Back (Kfb Knitt In Knitting What Does Kfb Mean


Note the image below.


*
Sites and also frequencies that ectopic pregnancy. By Donna M. Peretin, RN. (A) Ampullary, 80%; (B) Isthmic, 12%; (C) Fimbrial, 5%; (D) Cornual/Interstitial, 2%; (E) Abdominal, 1.4%; (F) Ovarian, 0.2%; (G) Cervical, 0.2%.