| 释义 |
Haversian, a. Anat.|həˈvɜːsɪən|
[f. the name of Clopton Havers, an English anatomist (c 1690).]
Applied to certain structures in bone discovered by Havers, as in
Haversian canal, one of the minute cylindrical passages in bone which form the channels for blood-vessels and medullary matter. H. glands, the fringed vascular folds of the synovial membranes, described by Havers as mucilaginous glands, and regarded by him as the source of the synovial secretion; also called H. folds, H. fringes. H. lamellæ, hollow cylinders of bone tissue surrounding and concentric with a Haversian canal. H. space, the name given to a Haversian canal when large and irregular, as in growing bone and the cancellous tissue of adult bone. H. system, ‘term applied to the H. canal, its concentric lamellæ of bone, and the lacunæ with their canaliculi’ (Syd. Soc. Lex.).
1836–9Todd Cycl. Anat. II. 785/2 The fatty..structure named Haversian gland. 1842E. Wilson Anat. Vade M. 2 The cells represent the Haversian canals, and are each surrounded by concentric lamellæ. 1845–6Todd & Bowman Phys. Anat., Haversian system. 1855Holden Hum. Osteol. (1878) 15 Almost all the compact substance of bone is made up of a multitude of these ‘Haversian systems’. 1862Wood Nat. Hist. I. 9 The reptiles possess very few Haversian canals. |