. Cunningham il libro di testo di anatomia. Anatomia. Il midollo spinale. 519 Queste sono classificati in otto cervicale, dodici toracica e lombare cinque, cinque, sacrale e uno coccygeal; e secondo gli allegati di questi gruppi di nervi del midollo spinale è arbitrariamente suddiviso in cervicale, toracica e lombare e sacrale. In impiegando questi termini, quindi per diversi distretti del midollo spinale, si deve intendere che le regioni sono determinati dal nervo allegati e non da qualsiasi rapporto diretto tra queste parti del midollo spinale e le sezioni della verte

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. Cunningham's Text-book of anatomy. Anatomy. THE SPINAL MEDULLA. 519 These are classified into eight cervical, twelve thoracic, five lumbar, five sacral, and one coccygeal; and according to the attachments of these groups of nerves the spinal medulla is arbitrarily subdivided into cervical, thoracic, lumbar, and sacral regions. In employing these terms, therefore, for different districts of the spinal medulla, it must be understood that the regions are determined by the nerve attachments and not by any direct relationship between these parts of the spinal medulla and the sections of the vertebral column which bear the same names. Each spinal nerve is attached to the spinal medulla by an anterior or ventral and a posterior or dorsal root, and as these are traced to their central attachments they are seen to break up into a number of separate nerve fascicles or bundles, which spread out, in some cases very widely from each other, as they approach the side of the spinal medulla (Fig. 461). Each pair of nerves is therefore attached to a portion of spinal medulla of some length, and such a portion, with its pair of nerves, receives the name of a " segment of the spinal medulla." It must be clearly understood, how- ever, that, in so far as the surface of the spinal medulla is concerned, there is no means of marking off one segment from another except by the nerve attachments. In the cervical and lumbar regions of the spinal medulla the nerve-roots are somewhat crowded together, so that little or no interval is left between the adjoining root fila or fascicles of neigh- bouring nerves. In the thoracic region, however, distinct intervals may be observed, and the root fila are more loosely arranged. From this, it will be evident that the seg- ments in different parts of the spinal medulla are not of equal length. In the cervical region the segments measure about 12 mm. in length, in the thoracic region from 20 to 24 mm., and in the lumbar region about 10 mm. The n

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectanatomy
• bookyear1914