Chapter

Surface Neuroanatomy

Marco Catani and Michel Thiebaut de Schotten

in Atlas of Human Brain Connections

Published on behalf of Oxford University Press

Published in print March 2012 | ISBN: 9780199541164
Published online November 2012 | e-ISBN: 9780191753268 | DOI: http://dx.doi.org/10.1093/med/9780199541164.003.0014
Surface Neuroanatomy

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Surface anatomy of the cerebral hemispheres describes the general appearance of grooves and folds, generally referred to as sulci and gyri (or convolutions), respectively. Sulci vary in depth and the term fissure is used by some anatomists for the deepest sulci (e.g. lateral fissure, calcarine fissure). Intralobar sulci separate adjacent gyri within the same lobe, whereas interlobar sulci demarcate the boundaries between lobes. Gyri differ in length and width and are named according to their location (e.g. inferior frontal gyrus) or their shape (e.g. fusiform gyrus). For each gyrus we can distinguish two lateral walls and an external surface. It is estimated that about two-thirds of the cerebral cortex lies along the walls of the sulci and one-third on the visible surface (Henneberg, 1910). Often gyri merge into each other and their boundaries are then rather arbitrary.

Following separation of the two hemispheres along the longitudinal sulcus, one can distinguish three surfaces (dorso-lateral, medial, and ventral or basal) and three poles (frontal, temporal, and occipital) in each hemisphere. On inspection, the three surfaces present characteristic patterns of sulci and gyri.

Chapter.  6723 words.  Illustrated.

Subjects: Neuroscience

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