Buckmaster's Elements of animal physiology / by John Angell.

  • Angell, John
Date:
1866
Catalogue details

Licence: Public Domain Mark

Credit: Buckmaster's Elements of animal physiology / by John Angell. Source: Wellcome Collection.

    349/384 (page 337)
    The former enters into the structure of the voluntary muscles and the heart, the latter into the structure of the organic or involuntary muscles. Striated Muscular Fibre.—If a piece of flesh or muscle be examined under a magnifier, it will be seen to consist of parallel fasciculi, or bundles of fibres, bound together by sheaths of areolar tissue. If one of these fibres be examined carefully under a more powerful microscope, it will be seen to consist of still more minute parallel pale yellowish primary fibres, termed fibrillce, which have a beaded or striated appearance, from which this class of muscular fibres derives its name and character. These fibrillce form the ultimate or primitive structural element of striated muscular fibre j they are about i-4ooth to i-35oth of an inch in diameter. Each muscular fibre is invested in a delicate sheath or covering of areolar tissue, termed the sarcolemma. The fibres may be separated transversely into little discs, as well as longitudinally into fibrillce. Plan of Structure of Voluntary Muscle. Fibres Muscle Fasciculi Fascia. Fibrillae, Sarcolemma. Areolar tissue. Capillaries. Nerves. The fibrillce are composed of muscular fibrin or syntonin. The Sarcolemma, or Myolemma (from Gr., sarx, flesh; muon, a muscle; and lemma, a husk), is a trans- parent, colourless, tough, elastic, but very delicate, and in general structureless membrane, which forms the tube or sheath by which each striated muscular z