. Tumours, innocent and malignant; their clinical characters and appropriate treatment. dal epithelium resting on a basement tufts are well supplied with fine nerves. Although nothing is known with certainty on thepoint, it is supposed that the cerebro-spinal fluid exercisesmechanical functions; as the whole of the central nervoussystem is contained in a closed membranous sac, all thespace which is not occupied by tissue, or blood, is filled with,it. The intraventricular spaces communicate with the sub-arachnoid spaces at the lateral angles of the fourth ventricle;the actual lop
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. dal epithelium resting on a basement tufts are well supplied with fine nerves. Although nothing is known with certainty on thepoint, it is supposed that the cerebro-spinal fluid exercisesmechanical functions; as the whole of the central nervoussystem is contained in a closed membranous sac, all thespace which is not occupied by tissue, or blood, is filled with,it. The intraventricular spaces communicate with the sub-arachnoid spaces at the lateral angles of the fourth ventricle;the actual lopenings are known as the lateral recesses. Inspite of much careful dissection I have failed to detect theopening at the lower part of the fourth ventricle known asthe foramen of Magendie. Mechanical interference with theintraventricular communications will lead to distensionof the lateral ventricles. CHAPTER LXIl PSEUDO-CYSTS (Concluded) NEURAL CYSTS (Concluded) Spina bifida.—The term spina bifida is applied to congenitaldefects in the union of the laminae of one or more vertebrae,. Central canal ofthe cord. ,^^, - Expanded ; tissue. Fig. 336.—Lumbar region of a fcstus with spina bifida, variety myelocele. {AfterShattoch.) {Museum, Middlesex Hospital.) associated with malformation of the sj)inal cord or itsmembranes. The spinal cord and a large part of the bram are formedby the dorsal coalescence of the medullary folds. The fusionof these folds commences in the thoracic and extends intothe cephalic and caudal regions. For a short time aftercoalescence the embryonic cord and superficial epiblast re-main in contact. Gradually they become separated by theintrusion of connective tissue, some of which chondrifies and 638 MYELOCELE 639 afterwards ossifies to form vertebrae and intervertebral the early stages the cord has a longitudinal extent equalto that of the notochord, and this equality is maintained forsome time after the closure of the medullary groove. Subs
Size: 1551px × 1611px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
