An Elementary Text book of Biology Comprising Vegetable And Animal Morphology a
An Elementary Text book of Biology Comprising Vegetable And Animal Morphology a
J R James Richard Ainsworth Davis
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The following table will give a rough notion of their classification (after Huxley) : A. Muscles of Head j EpisMetal, superficial to the endoskeleton. And Trunk. \ flyposkeletal, within the enduskeleton. B. Muscles of Limbs. Intrinsic, taking origin in the limbs themselves (including girdles). Extrinsic, taking origin outside the limbs. The firm endoskeleton affords points of attachment, and this is often effected by the intermediation of cord-like tendons, almost entirely made up of white conn...ective-tissue fibres. The firm sheaths, aponeuroses, by which muscles are covered, may also serve for the attachment of other muscles. This is best seen in flat muscles, such as some of those forming the abdominal wall. The muscles are made up of bundles of transversely striated fibres, each of which is invested by a delicate sarcolemma, and contains numerous muscle-corpuscles i. E. , nuclei surrounded by small quantities of protoplasm. These fibres also exhibit longi- tudinal striations. From a physiological point of view the muscular tissue of Vertebrates is divided into (1) Involuntary, not under the control of the will, including the unstriated fibres of the viscera and blood-vessels, as well as the striated fibres of the heart ; and (2) Voluntary, under the control of the will, including the striated fibres of the ordinary muscle.
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