A Course of Elementary Instruction in Practical Biology
A Course of Elementary Instruction in Practical Biology
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b. The anterior visceral nerves ; a system of fibres arising from the above ganglion. The following can be seen with ease.
a. A ventral branch, distributed to the oesophagus.
/?. A dorsal one, to the salivary gland, the duct of which it accompanies.
y. An anterior one, to the roof of the buccal- mass.
3. Remove the whole nervous system, together with the buccal-mass and tentacle-bearing portion of the cephalic integument Pin down under water with its posterior end uppermost, and dissect off as ...much as possible of the sheath of the nerve-collar. Note, in addition to the nerves already dissected a. The buccal commissure; a delicate tract of nerve- fibres, seen, on raising the cut end of the oeso- phagus, to connect the buccal ganglia of opposite sides. It passes beneath the gullet.
IV. ] THE COMMON SNAIL. 299 b. The anterior aorta. Its cut end is clearly visible at this stage. (Cf. Sect. H. 3 b. } It perforates the nerve-collar ventrally, running beneath the parieto- splanchnic and above the pedal ganglia.
What to read after A Course of Elementary Instruction in Practical Biology?
You can find similar books in the "Read Also" column, or choose other free books by Th Huxley to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
b. The anterior visceral nerves ; a system of fibres arising from the above ganglion. The following can be seen with ease.
a. A ventral branch, distributed to the oesophagus.
/?. A dorsal one, to the salivary gland, the duct of which it accompanies.
y. An anterior one, to the roof of the buccal- mass.
3. Remove the whole nervous system, together with the buccal-mass and tentacle-bearing portion of the cephalic integument Pin down under water with its posterior end uppermost, and dissect off as ...much as possible of the sheath of the nerve-collar. Note, in addition to the nerves already dissected a. The buccal commissure; a delicate tract of nerve- fibres, seen, on raising the cut end of the oeso- phagus, to connect the buccal ganglia of opposite sides. It passes beneath the gullet.
IV. ] THE COMMON SNAIL. 299 b. The anterior aorta. Its cut end is clearly visible at this stage. (Cf. Sect. H. 3 b. } It perforates the nerve-collar ventrally, running beneath the parieto- splanchnic and above the pedal ganglia.
What to read after A Course of Elementary Instruction in Practical Biology?
You can find similar books in the "Read Also" column, or choose other free books by Th Huxley to read onlineMoreLess
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