| Casal, Gasper | <person> Spanish physician, 1691-1759. See: Casal's necklace. (05 Mar 2000) |
|---|---|
| Casal's necklace | A dermatitis partly or completely encircling the lower part of the neck in pellagra. (05 Mar 2000) |
| renal collar | In the embryo, a ring of veins around the aorta below the origin of the superior mesenteric artery. (05 Mar 2000) |
| collar | <plant biology> Region of junction between blade and leaf sheath of grasses. (09 Oct 1997) |
| collar bone | <anatomy> Also called the collar bone, it articulates with the shoulder on one end (at the acromion process of the scapula) and the sternum (breast bone) on the other. (27 Sep 1997) |
| 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) |
| collar incision | A cervical incision, placed one to two fingerbreadths above the sternal notch, that is frequently used for thyroid or parathyroid surgery. (05 Mar 2000) |
| collar of Venus | An obsolete term for syphilitic leukoderma involving the anterior neck and chest. (05 Mar 2000) |
| collar-stud chalazion | A chalazion that extends through the tarsal plate anteriorly (c. Externum) and toward the conjunctiva. (05 Mar 2000) |
| correction collar | <microscopy> An adjustment collar provided on some high-numerical aperture, microscope objective lenses. Rotation of the collar adjusts the height of certain lens elements in the objective lens to compensate for variations in coverslip thickness or immersion media. at high numerical apertures, even a small deviation of the coverslip thickness (by as little as a few micrometres in some cases), or refractive index of the immersion medium from the designated standard, can introduce significant aberrations. (05 Aug 1998) |