. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Bruin of a new-lorn Lamb with Cyclopla. a, a, medullary expansion filled with serous fluid; b, optic nerve ; e, c, peduncles of the brain ; d, pons varolii; e, medulla oblongata ; /', /', cerebellum ; g, spinal medulla; 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, the cerebral nerves, existing besides the optic nerve. been observed (G. Vrolik, Rudolphi). See fig. 615. Fig. (Altered from Rudolphi by W. Vrolik.) Human Ovum, icilh an Embryo of tiro months, affected with hydrocephalus. Internal hydrocephalus is, however, not alway
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Bruin of a new-lorn Lamb with Cyclopla. a, a, medullary expansion filled with serous fluid; b, optic nerve ; e, c, peduncles of the brain ; d, pons varolii; e, medulla oblongata ; /', /', cerebellum ; g, spinal medulla; 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, the cerebral nerves, existing besides the optic nerve. been observed (G. Vrolik, Rudolphi). See fig. 615. Fig. (Altered from Rudolphi by W. Vrolik.) Human Ovum, icilh an Embryo of tiro months, affected with hydrocephalus. Internal hydrocephalus is, however, not always occasioned by arrest of develope- inent in an early period of formation, but may be produced by chronic inflammation, (G. Vrolik), to which the child is, without doubt, as much subject during uterine life as after its birth. The principal causes of it seem to be external injuries suffered by the pregnant woman, and sometimes even reite- rated contact by the act of copulation, if the pelvis is large, and the womb seated very low. Pseudo-membranes are on this ac- count often found on the internal surface of the expanded ventricles (G. Vrolik), by which the deposition of the serous liquor may be limited to one or more of the cerebral ven- tricles, so as to produce an asymmetrical expansion of the head ; this is, on the con- trary, symmetrical, if both the lateral with the third and fourth ventricle are equally and universally extended by the fluid. The head acquires, in such case, an enormous, but sym- metrical, volume (E. Sandifort, W. Vrolik). The slower such a secretion of fluid takes place, the slower the head increases in volume, and the less it endangers life, and the less the free evolution of the mental faculties is interfered with. Some cases are men- tioned, in which life lasted sixty years (G. Vrolik), thirty years (Michaelis), and fifty- f'ouryears (Gall). It is remarkable that in many of these cases, neither the senses nor the intellectual faculties were in the lea
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