Bauhaus-Universität Weimar

OTHER INVOLUNTARY MOTIONS, 35 
the right ventricle and auricle have wholely loft their motion, the 
right finus venofius continues for fome little time gently to palpitate, 
and its tremulous motion, when about to ceafe, may, like that of 
the heart, be renewed by heat, or any thing elfe that is capable 
to irritate its fibres *. After this right finus venofius has alfo ceafed 
to move, the trunks of the vena cava adjoining to it continue, for 
fome time, to be alternately contracted and relaxed. When the 
vena cava inferior is tied, and the blood is fqueezed out of that 
portion of it which is between the ligature and the heart, its 
motion immediately ceafes, but begins again as foon as the liga¬ 
ture is removed and new blood is allowed to flow through that vein. 
Laftly, after both the vena cava of a rabbit were tied, and the 
blood contained in them and the heart was evacuated by a hole 
made in the fubftance of this organ, its motions, as well as thofe 
of its auricles, and the trunks of the vena cavay ceafed at once, 
but were renewed upon the ligatures being taken away j\ 
Dr Langrish informs us, that in a dog whofe thorax he opened, 
and whofe lungs he kept in ablion with a pair of bellows, the au¬ 
ricles began the motion, and the fyftole of the ventricles always fol¬ 
lowed that of the auricles. When he defifted from blowing frefh 
air into the lungs, the heart lay ftill, but recovered its motion when 
the lungs were diftended anew. In this ablion, he never could 
difcover that the ventricles began the motion, but the auricles al¬ 
ways contracted fir ft, and immediately after them, the ventricles ; 
though at laft he obferved feveral contractions of the auricles which 
were not fucceeded by any motion in the ventricles ±. From what 
has been faid, it appears, why the motions of the auricles and ven¬ 
tricles are not fynchronous, viz. becaufe they receive into their ca¬ 
vities at different times the returning blood, which, as a ftimulus, 
excites them into contraction. 
E 2 4, People 
* Harvey de motu cord. cap. 4. ; et Walæus de motu chyli ct fang, epift 1. ad fin. Bar¬ 
tholin. anat. p. 783. et 784. 
t See Bartholin, epiftol Anatom, cent. iv. p m. et 112. 
t Cronean le&urcs on muicular motion, p. 61. 62.
        

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