Human anatomy, including structure and development and practical considerations . er surface of the hemisphere. As a rule, it is recogni/abie during the lastweek of the fifth month, although its appearance may be delayed until a month later (Cunning-ham). When laid down as two separate furrows, as it not infretiuently is, the lateral one is thelonger and usually the dee|)er. Siibse(|uently the two parts become united into a continuoussulcus, although ver>- rarely the primary condition may persist and the Kolandic fissure beinterrupted by a superficial gynis. During the fifth month, on the m
Human anatomy, including structure and development and practical considerations . er surface of the hemisphere. As a rule, it is recogni/abie during the lastweek of the fifth month, although its appearance may be delayed until a month later (Cunning-ham). When laid down as two separate furrows, as it not infretiuently is, the lateral one is thelonger and usually the dee|)er. Siibse(|uently the two parts become united into a continuoussulcus, although ver>- rarely the primary condition may persist and the Kolandic fissure beinterrupted by a superficial gynis. During the fifth month, on the mesial surface of the hemi-sphere, also appear the calcariue the parieto-occipital fissure. The first of these is oftenmapped out by two or even three separate parts, of which the front one is complete and, as theanterior limb of the calcarine fissure, (produces the elevation known as the calcar avis. The Superior Median genioilate V)odyLateral geniculate t)odyOccipital lobe Parietal lobe Pallium Inferior colHculnsW nerve Maniniillary bodyCerebellum Rhombic lip. Optic stalkInfundibulumPituitary bodyV nerve \III nerve Frontal lobetemporal lobe — Sylvian fossaRhinencephalon Spinal cord Reconstruction of brain of human embryo of five v^eeks ( mm.); external lateral aspect. X U- Drawn from His model. other parts subsequently unite to form the posterior limb of the calcarine .<issure. When firstformed the parieto-occipital fissure is usually distinct from the calcarine, with which, however,it soon becomes confluent. Towards the end of the fifth month the collateral fissure appearson the inferior surface of the hemisphere. The i?iferior and the superior precentral sulcus mayusually be distinguished, the lower slightly in advance of the upper, during the early weeks ofthe sixth month, and about the same time the superior temporal and the olfactory sulcus. Themiddle of the sixth month marks the appearance of the postcentral and occipital limbs of theinterpajiet
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
