. Anatomy, descriptive and applied. Anatomy. 916 THE NERVE SYSTEM mode of branching, and anastomosis with neighboring fissures or manner of interruption by gyral isthmuses. The range of individual variations is so great that no two brains can be said to be exactly ahke; in fact, one may find numberless stages of complexity in the cerebral surface configuration from the simply fissured brains of mentally inferior individuals and races to the complexly fissured and more highly organized brains of vigorous thinkers and talented geniuses among the highly intellectual races of man. INTERCEREBRAL F.
. Anatomy, descriptive and applied. Anatomy. 916 THE NERVE SYSTEM mode of branching, and anastomosis with neighboring fissures or manner of interruption by gyral isthmuses. The range of individual variations is so great that no two brains can be said to be exactly ahke; in fact, one may find numberless stages of complexity in the cerebral surface configuration from the simply fissured brains of mentally inferior individuals and races to the complexly fissured and more highly organized brains of vigorous thinkers and talented geniuses among the highly intellectual races of man. INTERCEREBRAL FISSURE GYRE Fig. 676.—Cerebral fissures and gyres ?< Cerebral Lobes and Fissures.—The cerebral surface is divided into five prin- cipal areas, called lobes, demarcated by certain constant fissures which are more or less conspicuous, and were therefore selected by the older anatomists as arbi- trary boundary lines; these are termed the interlobar fissures. The lobes are: (1) the frontal; (2) the parietal; (3) the temporal; (4) the occipital; (5) the island of Rail or insula. The interlobar fissures are: (1) the sylvian; (2) the central; (3) the occipital; (4) the calcarine; (5) the circuminsular. A series of fissures demarcating die rhinencephalon from the pallium or cerebral mantle proper will be considered at a later stage. The Interlobar Fissures. The Sylvian Fissure and Its Rami [fissura cerebri later- alis [SylmiJ).—This fissure is a well-marked cleft on the base and side of the cerebral hemisphere. Traced laterad from the region of the anterior perforated substance, it begins as a deep depression between the orbital surface of the frontal lobe and the temporal pole, corresponding to the bony ridge formed by the lesser wing of the sphenoid and extending to the convex surface. This portion of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustra
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
