The principles of histology, descriptive and practical : Book I. Descriptive histology / By Albert H. Tuttle.

  • Tuttle, Albert H. (Albert Henry), 1844-1927.
Date:
1898
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Licence: Public Domain Mark

Credit: The principles of histology, descriptive and practical : Book I. Descriptive histology / By Albert H. Tuttle. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    This definition, while true of the great majority of tis- sues, cannot be universally applied in a literal sense. There are some tissues (e. g., adenoid tissue) regularly involving more than one kind of element. Such may with propriety be called Compound Tissues. The combination of tissues gives rise to organs of defi- nite structure and function; and, conversely, every organ is ultimately resolvable into its component tissues. There are, however, certain tissue-aggregates which, while themselves entitled to be regarded as organs, sustain a similar relation to the structure of the larger and more complex bodies to which that term is applied as do the tissues themselves. Among such are the smaller blood and lymph vessels, small glands, adenoid masses, etc. The con- sideration of these compound factors of structure may properly accompanj'- that of the tissues. There also occur in the body substances (notably the blood) which, while they lack that coherence properly as- sociated with the idea of a tissue, contain cellular or cor- puscular elements analogous to those forming the basis of tissue-structure. While they can hardly be classed as tissues, their study is clearly within the province of His- tology. The cells (or, more strictly, the corpuscles) to which reference has been made, although of exceedingly various form and size, are fundamentally similar in that each is a mass of (more or less modified) protoplasm provided for a