" The occipital region comprises fields 17, 18a and 18b. Field 17, as defined by cell and fiber criteria, is the area of projection of the dorsal lateral geniculate nucleus (Lashley, '34). Its cortical position in the mouse has been determined by the hodo- logic studies of Valverde ('68), Valverde and Esteban ('68) and Frost and Caviness ('74). This position is essentially that as- signed field 17 in the rat by Krieg, except that in the mouse it continues onto the medial surface at the caudal pole of the hemisphere. Throughout its circumference, area 17 is surrounded by a zone of transi- tional, though cytoarchitectonically simi- lar, cortex. " " The cortex of field 17 is wider than the other two occipital fields. The width and cellular density of its layer IV, the distinctness of its hypocellular zones, Va and Vc, and the width of its sublamina VIa are all relatively greater than in 18a and 18b. The widths of layers I11 and V, on the other hand, are less in field 17 than in the other two fields. Fields 18a and 18b are virtually indistinguishable in cell stains (also, Schneider, '69). The division between the two fields rests entirely upon the moderately heavy radial and tangential fiber pattern which continues through the more rostral and lateral part of field 17 into 18a. The more medial aspect of field 17 and adjacent 18b, by conhast, contains a much reduced complement of radial and tangential fibers. "
Summary:
This change is a minor edit.
Username: