. Text-book of anatomy and physiology for nurses. s, eachfiber composed of little bun-dles of muscle-cells. All ofthese are wrapped in connec-tive tissue, bound togetherand enclosed in a sheath. Examining a muscle with care,we can strip off the sheath of con-nective tissue (epi-mysium), and weshall find that it sends layers downinto the muscle to form septa orpartitions (peri-mysium) enclosingthe bundles (or fasciculi) of whichthe muscle is made the aid of the microscope the fiber cells which compose the bundlesare revealed, surrounded by still more delicate connective tissue (endo-mys
. Text-book of anatomy and physiology for nurses. s, eachfiber composed of little bun-dles of muscle-cells. All ofthese are wrapped in connec-tive tissue, bound togetherand enclosed in a sheath. Examining a muscle with care,we can strip off the sheath of con-nective tissue (epi-mysium), and weshall find that it sends layers downinto the muscle to form septa orpartitions (peri-mysium) enclosingthe bundles (or fasciculi) of whichthe muscle is made the aid of the microscope the fiber cells which compose the bundlesare revealed, surrounded by still more delicate connective tissue (endo-mysium).Also, under the microscope the fiber cells of voluntary muscle tissue appearstriped, consequently voluntary muscle is said to be striped or striated. In-voluntary fiber cells are plain—involuntary muscle is unstriped or sort of muscle is found in internal organs, whose work must go on con-tinually without our conscious supervision. Exception.—The heart: which acts whether we will or not, although itsmuscle is Fig. (Holden.) -Showing Lxtremities ofTendon. 5, Aponeurosis.— STRUCTURE OF MUSCLES. 79 In most cases the connective tissue is prolonged beyond the mus-cle into a white cord or band called a tendon, if the muscle is long andthick; or into a broad thin layer called an aponeurosis if the muscle isflat; and by these tendons and aponeuroses the muscles are attachedto bones and other organs. Sometimes the red fibers are attacheddirectly to the parts which they move, but in by far the greater num-ber the tendons are conspicuous (Fig. 67). Muscles are described asconsisting of a body and two ex-tremities; the body or belly beingthe red contracting part whichswells in action, while tendons(which are possessed by most ofthe muscles) are simply strongwhite fibrous bands having nopower to contract and no elas-ticity. This is equally true ofthe aponeuroses. The attachments of the ex-tremities are spoken of as theorigin and the inserti
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