File:Text-book of anatomy and physiology for nurses (1913) (14766651732).jpg

Identifier: textbookofanatom00bund (find matches)
Title: Text-book of anatomy and physiology for nurses
Year: 1913 (1910s)
Authors: Bundy, Elizabeth Roxana, 1850-
Subjects: Anatomy Physiology
Publisher: Philadelphia : P. Blakiston's son Co
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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center or centerfor heart-action and vessel-tone combined; the heat regulati.igcenter; deglutition center, and others. Certain of these may bemodified by the will; for example, the respiratory act—we maytake a long full breath or a short and shallow one; breathe rapidlyor slowly, at will. Deglutition is still nearer to the realm of voluntarymovements—only when food reaches the esophagus, is the act ofdeglutition purely reflex. (Here is the first appearance of unstripedmuscle in the digestive tract.) Going higher we find the cerebellum presiding over the coordi-nation of conscious and voluntary movements, through its connec-tion with the cortex of the cerebrum on one hand, and the pons,medulla and cord on the other. Also upon the cerebellum dependsthe maintenance of body equilibrium. For this it is necessary thatthe semicircular canals of the internal ear should be normal and inperfect connection with the cerebellum. Other sensory connections 268 ANATOMY AND PHYSIOLOGY FOR NURSES.
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Fig 190.—Diagram Showing the Relation oe Skeletal, Muscle and NerveTissues (G. Bachman). f.a. Bones of the forearm representing the skeletal tissue; e.y.the elbow joint, the fulcrum of the lever formed by the bones of the forearm; W_. aweight acting in a downward direction and representing the passive force of gravi_ty;^sk m. a skeletal muscle acting in an upward direction and the source of the activepower to be applied to the lever; sp.c. transection of the spinal cord showing the relationof the white and the gray matter: m.c. a motor cell in the anterior horn of the graymatter; ef.n. an efferent nerve-fiber connecting the motor cell from which it arises withthe skeletal muscle and contained in the ventral roots of the spinal nerves; aj.n. anafferent nerve-fiber arising from the ganglion cell along its course and connecting theskin, 5., on the one hand with the spinal cord on the other hand and contained in thedorsal roots of the nerves; c.s.c. coronal section of the cerebrum showi

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