File:The physiology of the circulation in plants - in the lower animals, and in man - being a course of lectures delivered at surgeons' hall to the president, fellows, etc. of the Royal college of surgeons (14782955935).jpg

Identifier: physiologyofcirc00pett (find matches)
Title: The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc. of the Royal college of surgeons of Edinburgh, in the summer of 1872
Year: 1873 (1870s)
Authors: Pettigrew, James Bell, 1834-1908
Subjects: Blood Blood Circulation Plant Physiological Phenomena
Publisher: Edinburgh : Oliver and Boyd
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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involuntary fibres areapparently homogeneous in texture. They, however, in some cases, present amottled granular appearance, the granules being arranged in a linear series.This condition Bowman is inclined to regard as an approximation towards thestructure of the striped or voluntary fibre ; the granules being of about thesame size as those in the voluntary fibres. In the simple muscles of the loweranimals, consisting in some cases of only one or two rows of sarcous elements, atransition from the striped towards the unstriped fibres may be perceived ; thetransverse markings under these circumstances being irregular, broken, or faintlymarked. 172 PR J. BELL PETTIGREW ON THE clear, granular, and brittle, so that they break off suddenly, andpresent a square extremity. Many of them display a rod-shapednucleus in their interior. They occur in the arteries, lymphatics,stomach, intestine, bladder, the pregnant uterus, the ducts ofglands, the gall-bladder, vesiculi seminales, etc. Fitf. 113.
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Fig. 113.— A, Un triped elementary fibres from human colon: treated with and withoutacetic acid. B, Elementary fibres from pectoral muscle of foetal calf, two and a half monthsold, showing corpuscles a; a, magnified300 diameters. C, Elementary fibres from larva ofdragon-fly, in an early stage of development, showing central row of corpuscles, magnified 300diameters.—Bowman. D, Muscular fibrils of pig, magnified 720 diameters, c, Single fibril,showing quadrangular outline of component particles, their dark central part and brightmargin, and their lines of junction crossing the light intervals, b, Longitudinal segment offibre, consisting of a number of fibrils still connected together, a, Other smaller collectionsof fibrils. —From a Preparation by Mr Leatham, after Dr Sharpey. E.—Fragment of an elementary fibre of the skate, held together by the untorn and twistedsarcolemma. a, Sarcolemma; b, b, Opposite fragments of the fibre. P.—Fragments of striped elementary fibres, showin

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