. Journal of anatomy . rebral than fact, no absolutely indubitable cerebellar tissue has been discoveredeither in the protrusion or elsewhere. It should be noted, in this connection,that the semicircular canals were present, so the lack of cerebellar tissue isnot associated with any deficiency here. But in the cord there is no traceof Clarkes column, and hence, of course, there is no cerebellar tract. Owing to the masses of blood-vessels and the numerous lia?morrhao-es in Cyclopean Fnetus with Hernia Encephali 61 the herniated part, the interpretation is by no means easy, and a r
. Journal of anatomy . rebral than fact, no absolutely indubitable cerebellar tissue has been discoveredeither in the protrusion or elsewhere. It should be noted, in this connection,that the semicircular canals were present, so the lack of cerebellar tissue isnot associated with any deficiency here. But in the cord there is no traceof Clarkes column, and hence, of course, there is no cerebellar tract. Owing to the masses of blood-vessels and the numerous lia?morrhao-es in Cyclopean Fnetus with Hernia Encephali 61 the herniated part, the interpretation is by no means easy, and a renewedexamination must be made before a linal statement can be justified. Thepossibility of an unusual amount of torsion and flexion of the primitivenervous tube cannot be overlooked {cf. Niigeli, Arehiv far EntwickeluiKjs-mechanih, Band v.). The Spinal Cord. (Figs. 3-7, incl.) The region of the cord and bulb is remarkable for the great wealth ofblood-vessels in the ensheathing membranes. The central canal is irregular. FioN. 5 and ;. 5.—Traiisveiso section of the thoracic region of the spinal cord of the Cyclopean monster ( MC ).Fig. 6.—Transverse section of tlie thoracic region of the spinal cord in a normal fietns of seven months. in shape and is dilated througliout its length. In the thoracic region,altliough large, it is, as normally, circular; but in the cervical and lumbarregions, especially in the latter, it has retained something of thf piimitiveslit-like form. In several places its wall has been broken through, so thatit is brought into communication with cavities in the actual substancf ofthe cord. This would seem to indicate that, although the canal 62 Mr F. W. Watkyn-Thoinas normal closure, it was afterwards distended by cerebro-spinal fluid whichcould not escape into the ventricles, probably owino- to the pressure aboutthe neck and cranium. The cord from a case of hydrocephalus showedvery similar features. In the lumbar region some large cavitie
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
