File:The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 (1908) (14778335092).jpg

Identifier: problemofagegrow1908mino (find matches)
Title: The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907
Year: 1908 (1900s)
Authors: Minot, Charles Sedgwick, 1852-1914
Subjects: Old age Growth Death Aging Growth Death
Publisher: New York, Putnam
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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19), and is sodisposed, further, that a series offine lines are produced across thefibre itself (Fig. 20), each line cor-responding with a special sort ofmaterial different from the originalprotoplasm. These cross lines give to the voluntary Fig. 19. Cross SectionOF A Lingual Muscle FibreOF THE Mocassin Snake, An- CISTRODON PiSCIVORUS. The single large dark spot repre-sents a nucleus. Each smalldot represents a cross sectionof a muscle fibril. There areseveral hundred in each fibre. ,1 Fig. 20. Part OF aMuscle Fibre of theHuman Tongue toShow the Cross Stri-ations. Two nucleiare included, one ofwhich is shown at theedge of the fibre, theother in surface view.In the adult striatedmuscle fibres of mam-mals the nuclei are su-perficially placed. THE CELLULAR CHANGES OF AGE 63 muscle fibres a very characteristic appearance, inconsequence of which they are commonly desig-nated in scientific treatises by the term striated. Astriated muscle fibre is that which is under the con- Blood-ves-sels.
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Nucleus. Nucleus. Inner sur-face of theretina (to-ward thelight). Blood-vessels. Fig. 21. Section of a Human Retina, from Stohrs Histology, sixthAmerican edition. Although the retina is very thin it comprises no lessthan twelve distinct layers ; the outermost layer is highly vascular. The pig-ment layer prevents the escape of light. The rods and cones convert the lightwaves into a sensory impulse, which is transmitted through the remaininglayers of the retina to the optic nerve. The total structure is extremelycomplicated. trol of our will. It should perhaps be mentioned thatthe muscle fibres of the heart are also striated, thoughthey differ very much in other respects from thetrue voluntary muscles. Last of all for this series of demonstrations, I have 64 AGE, GROWTH, AND DEATH chosen a section of the retina (Fig. 21). One can seenear the top of the figure the pecuHar cyhndrical andtapering projections (rods and cones) which arecharacteristic of a retina, projections which are ofespe

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