. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 828 OSSEOUS SYSTEM. (COMP. ANAT ) obvious; it is only necessary for the student to recur to less distorted forms of the head at once to recognise the reality of the resem- blance. Should other proof indeed be wanting, the manner in which all the cerebral nerves make their exit from the cranium would in itself offer a convincing argument. In every olher part of the cerebro-spinal axis the nerves in- variably are given off through passages situated between contiguous vertebrae, which are called, from this circumstance, par
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 828 OSSEOUS SYSTEM. (COMP. ANAT ) obvious; it is only necessary for the student to recur to less distorted forms of the head at once to recognise the reality of the resem- blance. Should other proof indeed be wanting, the manner in which all the cerebral nerves make their exit from the cranium would in itself offer a convincing argument. In every olher part of the cerebro-spinal axis the nerves in- variably are given off through passages situated between contiguous vertebrae, which are called, from this circumstance, par excellence, inter- vertebral foramina ; nay, so sure is this guide, that in those instances where the vertebral pieces are confused, so as to be otherwise un- distinguishable from each other, the position and number of these foramina is sufficient to indicate the number of vertebrae of which the part of the skeleton in question originally con- sisted, before the pieces composing it became permanently anchylosed. Precisely in the same manner the nerves derived from the encephalon pass out through the interspaces between the occipital and parietal vertebras, or between the latter and the frontal; and, although from the great bulk of the encephalic masses and the number of nerves derived therefrom, the passages through which they principally escape have been named foramina lucera, indicating their size and irregularity; Fig. 438. Fig. Skull of Boa Constrictor. they are not on that account less the repre- sentatives of the intervertebral foramina pro- perly so called. The mere circumstance of the channels of some of these nerves being, in the human subject and in other Mammifera, cir- cumscribed by rings of bone and thus con- verted into distinct foramina, to which special names have been given by the human osteo-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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