. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. Amowo the hii^er vertebrates the spinal cord is found to consist of nerveKJolls, nerve-flbers, and a delicate connective tis- sue binding tiiem together ; while these different structures are arranged in definite forms, so that a cross-section anywhere pre- sents a characteristic appearance, the more important gangli- onic nerve-oells being internal and forming a large part of th
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. Amowo the hii^er vertebrates the spinal cord is found to consist of nerveKJolls, nerve-flbers, and a delicate connective tis- sue binding tiiem together ; while these different structures are arranged in definite forms, so that a cross-section anywhere pre- sents a characteristic appearance, the more important gangli- onic nerve-oells being internal and forming a large part of the gray matter of the cord. All the various regions of this organ or series of organs are connected with one another, white with white and gray matter, as well as white with gray substance. While we do not attempt to furnish a complete and detailed account of the anatomy of the cord or other parts of the nervous system, for which the student is referred to works on'anatomy, we would remind him that the spinal cord Is situated within a bony case with joints permitting of a certain amount of move- ment, variable In different regions. Inasmuch as the cord Itself does not fill Its bony covering, but floats In fluid and teth-^red to the walls by bands of connective tissue. It Is well protected from laceration, bruising, or concussion. Like the brain, It has a protective tough outer membrane (dura mater) with a doser- fltting inner covering abounding in blood-vessels {pia mater). The white matter of the cord invest* the horns of gray matter and is made up of nerve-flbers wanting the outer sheath. Here, as elsewhere, these fibers have only a conducting func- tion ; they do not originate nervous impulses. The gray matter, on the other hand, abounds in cells, some of them with many prooesaes, that can originate, modify, and conduct impulses. Certain weU-reoognlied groups of these cells are arranged In columns throughout the cord, as shown in the accompjatty- ing figiires. The supporti
Size: 1746px × 1432px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
