A manual of anatomy . obar fissures: 1. The Sylvian fissure [fissura cerebri lateralis) is about 2)4, inches(6 cm.) long and is seen at the base and side of the frontal end of thecerebrum. It is the deepest fissure and varies from 15 mm. at itsbeginning to 25 to 30 mm., at its deepest part. It extends back-ward and upward and serves to separate the frontal and parietallobes, above, from the temporal lobe, below. It consists of stem,posterior, ascending and anterior horizontal rami. When its lips areseparated, the insula, or island of Reil {central lobe) is exposed. Theinsula is surrounded by t
A manual of anatomy . obar fissures: 1. The Sylvian fissure [fissura cerebri lateralis) is about 2)4, inches(6 cm.) long and is seen at the base and side of the frontal end of thecerebrum. It is the deepest fissure and varies from 15 mm. at itsbeginning to 25 to 30 mm., at its deepest part. It extends back-ward and upward and serves to separate the frontal and parietallobes, above, from the temporal lobe, below. It consists of stem,posterior, ascending and anterior horizontal rami. When its lips areseparated, the insula, or island of Reil {central lobe) is exposed. Theinsula is surrounded by the circuminsular fissure {sulcus circulares). 2. The central fissure {fissura centralis) starts upon the medial sur-face and then extends obliquely downward and forward on the lateralsurface, in a sinuous manner, for about 4 inches (10 cm). It makesan angle of about 71° with the midline and separates the frontalfrom the parietal lobe. THE FISSURES AND LOBES OF THE CEREBRUM 387 Central fis: Frontal lobe. Parietal lube. X^Occipital lobe Temporal lobe Cerebellun Lateral cerebral fissure (Silvius) Oblongata Fig. 276.—Left lateral aspect of the brain with the membranes removed. {From aphotograph.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
