. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Nervous system of Aplysia. In Sci/lhea, according to Mr. Gamer, the brain is entirely supra-oesophageal; it appears to be composed of four united ganglia, pro- bably the cerebral and branchial. The foot has become too insignificant to require appropriate ganglia. Mr. Garner has noticed two minute black spots, one on each side of the brain, composed probably of black pigment, which he considers to be rudimentary of Nervous system of Scylleea Pelagica. A, cerebral ganglion. D, pharyngeal ganglion. c, d, i, visceral
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Nervous system of Aplysia. In Sci/lhea, according to Mr. Gamer, the brain is entirely supra-oesophageal; it appears to be composed of four united ganglia, pro- bably the cerebral and branchial. The foot has become too insignificant to require appropriate ganglia. Mr. Garner has noticed two minute black spots, one on each side of the brain, composed probably of black pigment, which he considers to be rudimentary of Nervous system of Scylleea Pelagica. A, cerebral ganglion. D, pharyngeal ganglion. c, d, i, visceral branches. In Limax ater (common slug) the nervous system is apparently much more simple; but on a little examination it will be found to con- sist of the same essential parts. A large supra- cesophageal ganglion, bilobed, constitutes the brain (u,fg. 343), from each side of which a pair of nerves passes downwards to join a large sub- cesophageal ganglion, Fig. 343. which supplies nerves to the respiratory sac and to the foot or loco- motive apparatus. And the pharyn^eal ganglia are, as in Patella, con- nected with the anterior ganglion. In the sub- O3sophageal ganglion we see, conjoined, the pedal and branchial ganglia. In Buccinum unda- tum the principal ner- vous mass is sub-ceso- phageal, and from it nerves pass to the bran- chiae and viscera, and also to the foot and integument. The for- mer nerves form a gan- glion, which may be regarded as the bran- Nervous system of the cum- chial ganglion.]* mon black slu9 (l"nax For° the nervous sys- ^ . h , terns of Pteropoda and ganglion. b, infra-ceso- Cephalopoda, see the phageal ganglion, d, an- articles under those teri°r sub - oesophageal titles. ganglions. —In taking a general survey of the structure of the articulated animals, we observe that their body is divided into a certain definite number of segments, each one of which * See Garner's paper,, loc. Please note that these images are extracted fr
Size: 1275px × 1960px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
