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＜departmental bulletin paper＞
Studies on the mechanism of the opening and closing movement of bivalves. 4. On the position on which the resultant of adductor muscles acts

Creator
Creator Name
三宅, 正人
Miyake, Masato
Affiliation
Affiliation Name
九州大学農学部水産学教室
Laboratory of Fisheries Science, Faculty of Agriculture, Kyushu University
Language
Japanese
Publisher
九州大學農學部
Faculty of Agriculture, Kyushu University
Date
1952-03
Source Title
Science bulletin of the Faculty of Agriculture, Kyushu University
Vol
12
Issue
3
First Page
259
Last Page
262
Publication Type
Version of Record
Access Rights
open access
JaLC DOI
https://doi.org/10.15017/21166
Related DOI
九州大學農學部學藝雜誌 || 12(3) || p259-262
Science bulletin of the Faculty of Agriculture, Kyushu University || 12(3) || p259-262
http://www.agr.kyushu-u.ac.jp/
Related URI
九州大學農學部學藝雜誌 || 12(3) || p259-262
Science bulletin of the Faculty of Agriculture, Kyushu University || 12(3) || p259-262
http://www.agr.kyushu-u.ac.jp/
Relation
九州大學農學部學藝雜誌 || 12(3) || p259-262
Science bulletin of the Faculty of Agriculture, Kyushu University || 12(3) || p259-262
http://www.agr.kyushu-u.ac.jp/

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Details

Record ID
21166
Peer-Reviewed
Unrefereed
Subject Terms
二枚貝
開閉殻運動
双柱類
合力
可変性蝶番軸
靱帯
ISSN
0368-6264
NCID
AN0005519X
Notes
This report also describes the results of the experiments made for research (B) mentioned in Report 1. In dimyaria, the resultant of the two adductor muscles must be so disposed that there is an equilibrium between that and the action of ligament, and this fact was proved as follows. The author investigated respectively the action of ligament and the resultant of the two adductor muscles, and examined whether both actions would harmonize with each other. The behavior of ligament was caught on a kymograph at first, and then the author searched for the position of the temporary resultant of adductors which would correspond to the action of ligament. On the other hand the position of the true resultant of adductors was obtained by calculation on the ground that the force of adductor is proportional to the area of the cross section of adductor. It was proved that the two resultants thus obtained occupy almost the same position, and consequently that there is a harmonious action between the ligament and the adductor muscles.
二枚貝に於ける開閉殻運動は2枚の平板の開閉運動にたとえられることは第1報に於て説明したが，更に双柱類では次の如き関係が認められる．即ちFig.1に於てXYは蝶番軸，Pは後閉殻筋の力の中心点（p）に働く閉殻力，Aは前閉殻筋の力の中心点（a）に働く閉殻力，D_p，D_aは（p）点，（a）点に立つ垂線とXY軸との距離とすれば，閉殻力はPD_p＋AD_aで表わされる．而して靱帯の開殻せんとする力の能率をFとすれば，F>PD_p＋AD_aの時は開殻し，F<PD_p＋AD_aの時は閉殻する．此のPD_p＋AD_aは合力として，（p）及び（a）に立つ垂線を結ぶ線上に於て夫々の閉殻筋の力の大さの反比にない分する点Rに働くものと考えることが出来る．（但し此の場合閉殻筋の力の中心を如何にとるか，叉力の大さを如何にして計測するかゞ問題となるが，実際問題として狭い閉殻筋の中で力の中心点の取り方が少しくらい間違つても此の実験には余り影響がないので閉殻筋断面の重心を力の中心と考え，叉力の大さは断面積に比例するものとして実験を進めた．）扨て上の合力の働く点即ちRは如何なる点に位置するかと云うに，靱帯が固定している貝ではどこに合力が働いても，開閉殻に際し殻の前後に於ける開きに不動を生ぜず問題はないが，可変性蝶番軸を持つ貝では合力点の位置如何によつては甚しく傾斜した開殻状態を呈し，貝の常時に於ける開閉殻運動と著しく相違し不都合となる．此の場合閉殻状態を呈し，貝の常時における開閉殻運動と著しく相違し不都合となる．此の場合閉殻筋の合力は靱帯の作用と全く一致した行動を取ることが出来る位置に働いているべきである．著者は実験によりこの事実を確め得たので以下これに就て記する．
Created Date 2012.03.21
Modified Date 2023.12.01

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