. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 624 NERVOUS SYSTEM. (COMPARATIVE ANATOMY.) PISCES , REPTILIA. f Carp, Brain, , as 100 Chub as 100 \ Roach as 100 as 100 \ Triton as 100 ((Turtle as 100 AVES as 100 f Sheep as 100 7 Pirr Body. 80,600 84,200 52,900 142,500 27,300 454,500 9,100 22,600 32,300 3,500 MAMMALIA < as 100 C. Mouse as 100 In the brain of the Mammalia we shall find the same parts as heretofore to occupy our attention, though at an extraordinarily in- creased degree of developement: this, however, varying greatl
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 624 NERVOUS SYSTEM. (COMPARATIVE ANATOMY.) PISCES , REPTILIA. f Carp, Brain, , as 100 Chub as 100 \ Roach as 100 as 100 \ Triton as 100 ((Turtle as 100 AVES as 100 f Sheep as 100 7 Pirr Body. 80,600 84,200 52,900 142,500 27,300 454,500 9,100 22,600 32,300 3,500 MAMMALIA < as 100 C. Mouse as 100 In the brain of the Mammalia we shall find the same parts as heretofore to occupy our attention, though at an extraordinarily in- creased degree of developement: this, however, varying greatly in the different orders. Its direction, with regard to the spinal marrow, is no longer horizontal, as we found in the fishes and reptiles, but approaching more or less to a right angle ; the first traces of which inflection were perceptible in the birds. In the bat (Vespertilio inurinus); mouse (Man musculus); rat (Mm rattus); rabbit (Lepus cuniculus, Jig. 358); pig (Sus scrofa domes- tica); horse (Et/uits caballus); ass (Equus minus); sheep (OvisummonJ ; deer(Cervus damu); mole (Talpa Europtea); stoat (Mtts- tela euninea); cat (Fells cutus) ; and monkey (Cullithrix - —1 fig. 359); the brain exactly fills the cranial cavity, that cavity correspond- ing with the shape and size of the head. The size and bulk of the brain are greater than in any of the preceding classes, as shown by its relative weight compared with the body. In a sheep weighing, as near as could be calcu- lated, 7466 drachms, the brain weighed 33 drachms; the proportion of the brain to the body being as 100:22600. In a pig weighing about 7116 drachms, the brain weighed 22 drachms; the proportion being as 100:32350. The brain of a horse weighed drachms. In a mouse weighing 327 grains, the brain weighed 6£ grains, the proportions being as 100:3,500. On taking a review of the structure of the brain in Mammalia, we find that it presents a great variety of form and developement in its different parts. 1. Th
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