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Human anatomy, including structure and development and practical considerations . remains of their shrunken nuclei. These cornified scales are disposed in lamellae,which, in transverse section, pursue a course in general parallel with the dorsal sur-face. In nails which possess the longitudinal ridges, however, the latter coincidewith an upward arching of the lamellae dependent upon the conformation of thenail matrix (Brunn). In longitudinal section the lamellation is oblique, extending 1396 HUMAN AN ATOM . from aboe downward and forward, parallel to the shelving under surface beneath thewhi

Human anatomy, including structure and development and practical considerations . remains of their shrunken nuclei. These cornified scales are disposed in lamellae,which, in transverse section, pursue a course in general parallel with the dorsal sur-face. In nails which possess the longitudinal ridges, however, the latter coincidewith an upward arching of the lamellae dependent upon the conformation of thenail matrix (Brunn). In longitudinal section the lamellation is oblique, extending 1396 HUMAN AN ATOM . from aboe downward and forward, parallel to the shelving under surface beneath thewhi Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2ANGBCF

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7.2 MB (261.5 KB Compressed download)

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Dimensions:

1948 x 1283 px | 33 x 21.7 cm | 13 x 8.6 inches | 150dpi

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Human anatomy, including structure and development and practical considerations . remains of their shrunken nuclei. These cornified scales are disposed in lamellae, which, in transverse section, pursue a course in general parallel with the dorsal sur-face. In nails which possess the longitudinal ridges, however, the latter coincidewith an upward arching of the lamellae dependent upon the conformation of thenail matrix (Brunn). In longitudinal section the lamellation is oblique, extending 1396 HUMAN AN ATOM . from aboe downward and forward, parallel to the shelving under surface beneath thewhite area that rests upon the matrix. Minute air-vesicles, imprisoned between thehorny scales, are constant constituents of the nail-substance. When these occur inunusual quantities, they give rise to the white spots in the nail above mentioned. Corresponding respectively to the colored zones—the white, rosy and yellow—seen on the dorsal surface of the nail, the nail-bed is dixided into a proximal, Fig. ij6o. Suhtutincous tissueSi r itum gcrtnin itu uin , Str ituin (.oriRuni.. „ . .^ / ^ 5^ Transformation Conum ^^^^ ^ ^ zone of nail-bed i ^ -^ , / , ? - ^Matrix Longitudinal section of proximal part of nail lying within the nail groove. X 30. a middle and a distal region, each of which exhibits structural differences. Themost important of these regions is the proximal, known as the matrix, which liesbeneath the white area and alone is concerned in the production of the nail. The coriiuii of the nail-bed ^xi:?> in the different re, <jions in tlie arrangement and size of itselevations. Within the proxiniai third of the matrix, tiiese elevations occur in the form of lowpapiliie, which decrease in height and number until they disappear, a smooth field occupyingthe middle of the matrix. This even field is succeeded by one possessing closely set, low, narrow longitudinal ridges, that at the distal margin of the lunula suddenly gie place to morepronounced, but less numerous

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