Anastomosis

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Related to anastomosing: arterial anastomosis

anastomosis

[ə‚nas·tə′mō·səs]
(medicine)
A surgical communication made between blood vessels, for example, between the portal vein and the inferior vena cava.
An opening created by surgery, trauma, or disease between two or more normally separate spaces or organs.
(science and technology)
The union or intercommunication of parts or branches, such as blood vessels, streams, or leaf veins. Also known as inosculation.
A network of parts or branches created by the process of anastomosis.

Anastomosis

 

in animals, connections between nerves, muscles, and blood or lymphatic vessels. Anastomoses between arteries and veins, without the formation of capillary networks—that is, arteriovenous anastomoses—are of importance in regulating the blood supply of organs. In clinical practice, anastomosis is the name given to a connection between tubular organs which is artificial or has arisen as a consequence of disease. In higher plants, anastomosis is the connecting of tubular structures—for example, veins in leaves and branchings of latex vessels. In fungi, anastomosis is the connecting or concresence of two mycelium hyphae with the establishing of intercommunication between them. This occurs with an insufficiency of food and plays a role in the formation of diploid mycelium and the heterokaryon of haploid mycelium, since the cell nuclei move from one cell into another through the anastomoses.

References in periodicals archive ?
Histologically, there are anastomosing networks of blood vessels with highly atypical spindled cells that show enlarged, irregular hyperchromatic nuclei.
All of the cases described in those two series consisted of unilocular cysts, filled with lamellar keratin and exhibited minute, peripheral, anastomosing epithelial cords.
Microscopically, at low-power magnification the tumors were composed of a compact anastomosing capillary network supported in the edematous and myxoid background (Figure 2, A).
Pseudoangiomatous stromal hyperplasia is a rare, benign, breast stromal lesion that is classified under benign mesenchymal breast neoplasms in the WHO classification of breast disease.2 It is characterized by proliferation of stromal spindle cells with an intervening network of complex anastomosing channels lined by slender spindle cells.
Current data indicate that this secondary modification of the pelvic kidney collecting ducts is restricted to salamanders with the complex anastomosing pelvic kidney morphology; however, it must be recognized that kidneys from seasonal collections of salamanders exhibiting the nonanastomizing kidney morphology have not yet been investigated.
The histological features of ESFA are diagnostic and include multiple thin anastomosing cords and strands of benign appearing epithelial cells which are connected to the undersurface of the epidermis and with or without formation of lumina which is embedded in a loose fibrovascular stroma.
In camels, the RERM had a spongy appearance, and consisted of a dense network of anastomosing arteries occupying the entire cavity of the cavernous sinus.
The architectural patterns were quite variable from region to region, with neoplastic cells lining microcystic structures (Figure 1, A) or pseudoacini, or arranged in trabeculae or cords, anastomosing in a plexiform or filigree pattern (Figure 1, B).
(8,10) Histologically, tumors contain a proliferation of ramifying and anastomosing vascular channels that "dissect" through surrounding structures.
These branches leave the main trunk of the artery, pass between the two layers of mesentery, and form anastomosing arches or arcades as they pass outward to supply the small intestine.
The following parameters regarding the branches of axillary artery were evaluated: (1) Locations; (2) origins; (3) diameters of the branches at their origin; (4) length of the branches; (5) courses; (6) distance between origin of the branches and lateral margin of the first rib; (7) anastomosing and crossing patterns of the branches; (8) relations with the adjacent structures; (9) innervations and (10) the blood supplying patterns of the serratus anterior slips according to the muscle zones.
They display several growth characteristics: glandular spaces, trabeculae, festoons, ribbonlike patterns, anastomosing cords, and solid sheets with variable cohesiveness.