| collar-button abscess | An abscess consisting of two cavities connected by a narrow isthmus, usually formed by rupture of an abscesses through a fascial layer in the hand or foot. Synonym: shirt-stud abscess. (05 Mar 2000) |
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| collar-stud chalazion | A chalazion that extends through the tarsal plate anteriorly (c. Externum) and toward the conjunctiva. (05 Mar 2000) |
| collared flagellate | A term, in the series used to describe developmental stages of the parasitic flagellates, denoting the "barleycorn" form of the flagellate in the genus Crithidia characterised by a collarlike extension surrounding the anterior and through which the single flagellum emerges. See: amastigote, epimastigote, promastigote, trypomastigote. Synonym: choanoflagellate, collared flagellate. Origin: G. Choane, a funnel, + mastix, whip (05 Mar 2000) |
| collarette | The sinuous, scalloped line in the iris that divides the central pupillary zone from the peripheral ciliary zone and marks the embryonic site of the atrophied minor vascular circle of the iris. Synonym: iris frill. (05 Mar 2000) |
| collastin | Degenerated collagen. Synonym: collastin. (05 Mar 2000) |
| collateral | <anatomy> Situated side by side, adjacent and on the same radius of an axis. (09 Oct 1997) |
| collateral artery | <anatomy, artery> One that runs parallel with a nerve or other structure, one through which a collateral circulation is established. See: articular vascular network. (05 Mar 2000) |
| collateral branches of posterior intercostal arteries 3-11 | Branch arising near angle of rib and descending to run along superior border of rib below; distribution: lower half of intercostal spaces 3-11; anastomoses: collateral branches of anterior intercostal arteries. Synonym: ramus collateralis arteriarum intercostalium posteriorum III-XI. (05 Mar 2000) |
| collateral circulation | Compensatory circulation carried on through secondary channels after obstruction of the principal vessel supplying the part. (12 Dec 1998) |
| collateral digital artery | <anatomy, artery> Terminal branches of the common palmar digital artery that pass to the side of each finger. Synonym: arteria digitalis palmaris propria, collateral digital artery, digital collateral artery. (05 Mar 2000) |
| collateral eminence | A longitudinal elevation of the floor of the collateral trigone of the lateral ventricle of the brain, between the hippocampus and the calcar avis, caused by the proximity of the floor of the collateral fissure. Synonym: eminentia collateralis. (05 Mar 2000) |
| collateral fissure | A long, deep sagittal fissure on the undersurface of the temporal lobe, marking the border between the fusiform gyrus laterally and the hippocampal and lingual gyri medially; the great depth of the collateral sulcus results in a bulging of the floor of the occipital and temporal horn of the lateral ventricle, the collateral eminence. Synonym: sulcus collateralis, sulcus occipitotemporalis, collateral fissure, fissura collateralis, occipitotemporal sulcus. (05 Mar 2000) |
| collateral inheritance | The appearance of characters in collateral members of a family group, as when an uncle and a niece show the same character inherited from a common ancestor; in recessive characters it may appear irregularly, in contrast to dominant characters transmitted directly from one generation to the next. (05 Mar 2000) |
| collateral ligament | <anatomy> One of a number of ligaments on either side of, and serving as a radius of movement of, a joint having a hingelike movement; they occur at the following joints: elbow, knee, wrist, and the metacarpo-or metatarsophalangeal, proximal interphalangeal, and distal interphalangeal joints of the hands and feet. Synonym: ligamentum collaterale. (05 Mar 2000) |
| collateral ligaments | A number of ligaments on either side of, and serving as a radius of movement of, a joint having a hingelike movement. They occur at the elbow, knee, wrist, metacarpo- and metatarsophalangeal, proximal interphalangeal, and distal interphalangeal joints of the hands and feet. (12 Dec 1998) |