Human anatomy, including structure and development and practical considerations . limiting membrane, orBowmans membrane, is situated immedi-ately below the epithelium, and appears as ahomogeneous band, about .02 mm. in thick-ness at the center and thinner at the periph-ery, where it terminates without extendinginto the conjunctiva of the sclera. The mem-brane may be split into fine fibrilhe bythe use of suitable reagents, is connectedfirmly with the cornea proper by delicatefilaments, and is to be considered a special condensation of the latter. It containsno elastic tissue. The substantia pro
Human anatomy, including structure and development and practical considerations . limiting membrane, orBowmans membrane, is situated immedi-ately below the epithelium, and appears as ahomogeneous band, about .02 mm. in thick-ness at the center and thinner at the periph-ery, where it terminates without extendinginto the conjunctiva of the sclera. The mem-brane may be split into fine fibrilhe bythe use of suitable reagents, is connectedfirmly with the cornea proper by delicatefilaments, and is to be considered a special condensation of the latter. It containsno elastic tissue. The substantia propria constitutes the main portion of the cornea, and ismade up of interlacing bundles of connective tissue, which are directly continuouswith those of the adjacent sclera. The bundles are composed of fine fibrillse, havea flattened form, and are so disposed as to produce regular lamellae, about sixtyin number, running parallel with the surface. The alternating lamellae have a directionapproximately at right angles to each other and are frequently joined together by Fig. ^rU- \K Corneal spaces, after action of argentic nitrate ;surface view. •; 350. 1452 HUMAN ANATOMY. bands, which are especially minuious in the anterior lamella, to which the nameJibrce arcuatce has been given. The tibrilke and bundles are held toj^ether by anamorphous cement substance, and embedded in it are the cellular elements, thecorneal corpuscles. These are flattened connective tissue cells, with faintly jjranularprotoplasm, the nuclei of which in the adult are irregular and show nucleoli. Thecells are pro\ided with branching jjrocesses which anastomose with those of othercells both on the same level and with those between adjacent lamella-, and so con-stitute a continuous net-work of protoplasm, upon which the nutrition of the cornealargely depends. They have been described as occupying i)art of a regular systemof cell-spaces and canaliculi, but most recent investigations seem to indicate thatdu
Size: 1722px × 1451px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
