マアジの成長に伴う脳髄形態の変化

概要

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In order to examine gross-anatomical changes of the brain components of horse mackerel in accordance with their body-growth, and observation was made on the specimens which ranged from 15mm to 380mm in total length. The main results obtained are summarized as follows: 1. Most remarkable changes are observed at the following three stages. (a) The first stage: At the stage less than 40mm in total length, lobus opticus is exclusively large, but other parts of the brain are not so developed. However, development of both corpus cerebelli and crista cerebelli becomes distinct at the stage over 40mm in total length. (b) The second stage: In the specimens ranged from 80-100mm in total length, each part of the cerebellum, begins to show their characteristic features; especially, valvula cerebelli develops and lobus inferior enlarges. (c) The third stage: In the specimens of 140mm in total length, every part of telencephalon shows adult type. 2. The results above mentioned suggest that, in horse mackerel, there exists and intimate correlation between the behavioural modification and the morphological changes of some brain components, especially of the lobus opticus, cerebellum and telencephalon.
社団法人日本水産学会の論文