. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. 120. 1, 1, The scalp turned down. 2, 2, 2, The cut edge of the bones of theskull 3, The external strong membrane of the brain (dura mater,) suspended by ahook. 4, The left hemisphere of the brain, showing its 730. Of what does the cerebro-spinal centre consist? How is the nervoussystem divided? 731. What does the term brain designate ? Name are they protected ? Describe fig. * 330 ANATOMY, PHYSIOLOGY, AND HYGIENE. 732. The cerebrum is divided into two hemispheres, by
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. 120. 1, 1, The scalp turned down. 2, 2, 2, The cut edge of the bones of theskull 3, The external strong membrane of the brain (dura mater,) suspended by ahook. 4, The left hemisphere of the brain, showing its 730. Of what does the cerebro-spinal centre consist? How is the nervoussystem divided? 731. What does the term brain designate ? Name are they protected ? Describe fig. * 330 ANATOMY, PHYSIOLOGY, AND HYGIENE. 732. The cerebrum is divided into two hemispheres, by acleft, or fissure. Into this cleft dips a portion of the duramater, called the falx cere-bri, from its resembling a apparent design of this membrane is to relieve the oneside from the pressure of the other, when the head is reclin-ing to either side. Upon the superior surface of the cere-brum are seen undulating windings, called its inferior, or lower surface, each hemisphere admitsof a division into three lobes — the anterior, middle, andposterior. Fig. Fig. 121. A section of the skull-bones and cerebrum. 1, 1, The skull. 2, 2, The dura mater. 3, 3, The cineritious portion of the cerebrum. 4, 4, The medullary portion. The dark points indicate the position of divided blood-vessels. 5, 5, Thelateral ventricles. 732. How is the cerebrum divided ? What is the use of the falx cerebri?What is seen upon the superior surface of the brain F Its inferior ? ANATOMY OF THE NERVOUS SYSTEM. 331 733. When the upper part of the hemispheres is removedhorizontally with a sharp knife, a centre of white substance isbrought to view. This is surrounded by a border of gray,which follows the depressions of the convolutions, and pre-sents a zigzag outline. The divided surface will be seenstudded with numerous small red points, which are producedby the escape of blood from the division of the minute arte-ries and veins. The gray border is called the cortical, or
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