Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . e commencement of a series ™ercry and magnified fiveof evolutions that end with the diameters- After complicated raceme; the structure here consists of a con- * To this number belong, for example, the musk bag, and the anal sacsof many animals—the marten, the otter, &c., which exhale a peculiarodour or stench. They are, in fact, extensive involutions of the skin, ofsimple structure, occupied internally by shallow pits ; these s
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . e commencement of a series ™ercry and magnified fiveof evolutions that end with the diameters- After complicated raceme; the structure here consists of a con- * To this number belong, for example, the musk bag, and the anal sacsof many animals—the marten, the otter, &c., which exhale a peculiarodour or stench. They are, in fact, extensive involutions of the skin, ofsimple structure, occupied internally by shallow pits ; these structuresmight be regarded as simple follicles, which, upon occasion, however,may become more complicated, as they do in the anal sac of the hyaena,for example, which is made up of several racemes clustered together. •f On the structure of the glands in general, and of each of those men-tioned in particular, see the work of Mtiller, and the Elementary Treatiseson Anatomy of E. H. Weber and of Krause. J The pancreas of fishes has been very commonly quoted as affordingan example or type of the successive evolution of glands from the simplest S. 258 STHUCTTJRE OF GLANDS. geries of very large unramified cceca ; * but in the higher mam-malia and in man the wide excretory ducts pass over intofiner branched canals, upon which the terminal cells formbotryoidal clusters; the cells are on an average from 1-20th to1-15th of a line in diameter. [§424. Among the glands having tubular vessel-like secret-
Size: 1359px × 1840px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
