. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 596 we describe the peripheral connexion of nerves with the various tissues and organs, and it is much to be regretted that our knowledge in reference to that connexion is scarcely more complete or accurate than that of their origin. The only instance in which we can speak pretty confidently respecting the peripheral connection of nerves, is with regard to mus- cles. In the striped muscle, nerves appear to form loops, the convexities of which are di- rected across the fibres of the muscles. Each nerve-fibre passes at fir
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 596 we describe the peripheral connexion of nerves with the various tissues and organs, and it is much to be regretted that our knowledge in reference to that connexion is scarcely more complete or accurate than that of their origin. The only instance in which we can speak pretty confidently respecting the peripheral connection of nerves, is with regard to mus- cles. In the striped muscle, nerves appear to form loops, the convexities of which are di- rected across the fibres of the muscles. Each nerve-fibre passes at first parallel to the direc- tion of the muscular fibres, and then crosses them in an arched form to pass back into the bundle from which it had emerged, or to be mingled with the fibres of some neighbouring bundle, passing back in it to the centre, pro- bably to some part of it different from the place of origin of the nerve. As far as present means of observation enable us to judge, there does not appear to be any other connexion be- tween the nerve-tubes and the muscular fibres beyond the simple contact of the tubular mem- brane of the former with the sarcolemma of the latter. \\ e have no evidence of any mingling of the true nerve-substance with the sarcous elements, and, therefore, we are forced to con- clude that whatever be the nature of the in- fluence which nerve exerts upon muscle to pro- voke it to contraction, that influence is exer- cised through the two layers of homogeneous membrane which form the investments of the nervous and sarcous elements respectively. The best mode of observing the disposition of nerve in muscle is to examine under the microscope very thin and transparent muscles of some small animals. The abdominal mus- cles of the frog first afforded to Hales, and long after him to Prevost and Dumas, this opportu- nity ; the muscles of the eyeball in small birds were used by Valentin; Burdach examined the muscles of the frog's tongue; I have found the inte
Size: 1108px × 2255px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
