Human anatomy, including structure and development and practical considerations . sion, (7) the olfactory lobe, althou!L,di of impor-tance as representing- the peripheral part of the rhinencephalon of osmatic animals (asthose possessing- the sense of sn-iell in a hiiih decree are called ), is not related to theforeijoini;- sulci and comprises the rudimentary olfactory bulb and tract and associatedparts (paife 1151). It will l)e of advantaj^^e to describe the interlobar fissures as pre-paratory to a dctaileil consideration of the lobes. The fissure of Sylvius (fissura cerebri lateralis) is the
Human anatomy, including structure and development and practical considerations . sion, (7) the olfactory lobe, althou!L,di of impor-tance as representing- the peripheral part of the rhinencephalon of osmatic animals (asthose possessing- the sense of sn-iell in a hiiih decree are called ), is not related to theforeijoini;- sulci and comprises the rudimentary olfactory bulb and tract and associatedparts (paife 1151). It will l)e of advantaj^^e to describe the interlobar fissures as pre-paratory to a dctaileil consideration of the lobes. The fissure of Sylvius (fissura cerebri lateralis) is the most conspicuous fissureof the hemisphere. It bej^ins on the inferior surface of the brain in a depression, thevallecula Svlvii, which ojjens out on the anterior perforated space. The hrst part ofthe fissure, its stem, passes horizontally outward to the lateral surface of the hemi-sphere, forming-a deep cleft which separates the orbital area from the underlying tem- FiG. 981. Kdlatulic fissiirf Inferior preceiitral stilcus Inferior frontal sulcus .^sccndinir lim Posterior limb. -A -^ \ Orbital snrtace Horizontal limb Portion of lateral surface of ri^lit hemisphere, showing ascending, horizontal and posterior limbs of Sylvianfissure radiating from Sylvian point. B, T, O, pars basalis, triangularis and orbitalis of inferior frontal gyrus;ST, superior temporal gyrus. poral pole. On reaching the surface at the Sylvian point, the fissure divides () into {a) a short anterior horizontal branch, {b) a somewhat longer anteriorascending branch, and (r) a long posterior branch. The anterior horizontal branch (ramus anterior horizontalis), about 2 cm. inlength, extends forward into the inferior frontal gyrus parallel to and just above theinfero-lateral border, and forms the lower limit of the jxirs triangularis (page 1141). The anterior ascendino; branch (ramus anterior ascendens) passes upward andslightly forward into the hind-part of the inferior frontal convolution for a distance
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
