Human Physiology ❮ 187Figure 15.5 Major structures of the human brain. (a) Of the brain’s three ancestral regions, the forebrain is
massively developed and contains the most sophisticated integrating centers. One of its subdivisions, the telen-
cephalon, consists mainly of the cerebrum (cerebral hemispheres), which extends over and around most other
brain centers. The diencephalon contains the thalamus and hypothalamus. The other two ancestral regions, the
midbrain and hindbrain, make up the brian stem. (b) This rear view shows the bilateral nature of the brain com-
ponents. The cerebral hemispheres, corpus callosum (large fiber tracts connecting the hemispheres), and basal
ganglia are parts of the telencephalon. (FromBiology,8th ed., by Sylvia S. Mader, © 1985, 1987, 1990, 1993, 1996,
1998, 2001, 2004 by the McGraw Hill Companies, Inc. Reproduced with permission of The McGraw-Hill Companies.)
(a)(b)http://www.ebook3000.com