A laboratory guide for histology : laboratory outlines for the study of histology and microscopic anatomy / by Irving Hardesty ... With a chapter on laboratory drawing by Adelebert Watts Lee ... With 30 illustrations 2 of which are in colors.

  • Hardesty, Irving, 1866-
Date:
1908
Catalogue details

Licence: Public Domain Mark

Credit: A laboratory guide for histology : laboratory outlines for the study of histology and microscopic anatomy / by Irving Hardesty ... With a chapter on laboratory drawing by Adelebert Watts Lee ... With 30 illustrations 2 of which are in colors. 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.

    98/216 (page 82)
    characteristic of true glandular structure. On the basis of function, also, the definition of gland with internal secr-etion might be strained sufficiently to include them, for not only do both the lymph-glands and the spleen receive and act upon substances from the blood, but they also contribute substances to the blood, modified plasma (lymph), white blood-corpuscles, and, at times, the spleen and marrow contribute red blood-corpuscles. However, upon the basis of their structure, and the fact of their being directly interposed (as nodes) in the lymph chan- nels, both, the lymph-glands especially, are more appropriately studied as intimate parts of the lymphatic system proper. The structures more particularly classed as glands with internal secretion are those which follow. They are arranged for study in the order in which they differ in structure from the so-called lymph-glands. 1. The thymus. (a) From texts and atlases and, if possible, in a human fetus or infant, determine the position, attachments, shape, size, and color of the thymus. Note its very evident lobation and its consistency. Be- come familiar with its origin and development and with its variable occurrence and persistence at different ages. At what age is it usually largest and at what age is its atrophy usually completed ? (b) From a stained section, sketch a lobule showing its detailed struc- ture, its relation to other lobules, and the nature of the interlobular tissue. What functions may be inferred from its structure and in what does it differ from an ordinary lymph-gland? Under high power draw one of the thymic (Hassall's) corpuscles with its immediate surroundings. Wliere are these situated and at what age are they most abundant ? Their origin and significance ? 2. The glomus caroticum (the intercarotid gland.) (a) Learn its situation, size and color in man. From a stained section draw a small area under medium magnification, showing its struc- ture. What is its origin and probable function ? What structures of the pancreas does it resemble and in what features? Read up the cocygeal glands^' and compare. 3. The hypophysis cerebri (pituitary body). (a) From models and atlases and from a demonstration specimen of the brain itself, determine the position, connections, shape, and orientation of the hypophysis. Its size and color in the fresh? What are the conditions under which it has been found to vary ? (b) Draw under low power an entire stained vertical section passing transversary through the long axis of the body, and thus in the direction of its infundibulum and involving both its posterior and