. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. But in those cases in which the flat basis of the skull is only covered with a membrane and with cerebral nerves, in those in which there is a spongy substance upon it, and in those in which the skull, although flat, is otherwise complete, not the least probability exists of the rupture of a cerebral vesicle at an early period of formation. I am able to prove this, I think, by a small foetus of two months, in which the superior part of the skull is wanting, and in which a spongy mass occupies the place of the brain. It s
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. But in those cases in which the flat basis of the skull is only covered with a membrane and with cerebral nerves, in those in which there is a spongy substance upon it, and in those in which the skull, although flat, is otherwise complete, not the least probability exists of the rupture of a cerebral vesicle at an early period of formation. I am able to prove this, I think, by a small foetus of two months, in which the superior part of the skull is wanting, and in which a spongy mass occupies the place of the brain. It shows that acrania may also be a pri- mitive malformation, occasioned by the simul- taneous malformation of the brain and of the skull. Why I do not impute these malforma- tions to external injury, such as the leaping of a monkey on the belly of a pregnant woman (Sandifort), to a fall down stairs (Pauli), or to the influence of imagination, needs not be demonstrated. III. Fissure of the Sack Part of the Body. Hydrorachis and Spina bifida. — Fissure of the spinal column (spina bifida), and dropsy of the spinal medulla, occur each separately, or connected together. In the highest degree of fissure, the vertebral bodies even are cleft (J. T. Meckel, Tulp, Fleischmann). Fig. 613. represents such a case, after Cruveilhier. Fig. In a less degree, the vertebral bodies are complete, but their arcs very detective, being completely wanting, or laterally incurved and fused together. In the lowest degree, the two halves of the vertebral arcs are completed, but not united together, so that posteriorly an open space remains between them, and a fis- sure occupies the place of iheprocessus spinosi, which are separated into two lateral and equally incurved parts. When this form of fissure of the spinal column is not accompanied by hydrorachis, both parts of the vertebral arcs are not bent laterally, but meet each other so ex- actly, that no open space remains between them. Sometimes the
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