434 



MUSCI/LAK MOTION. 



extensors of the thigh, foot, and jaw, are decidedly predominant ; and, 

 according to M. Adelon, 1 experiments, instituted by Regnier with his 

 dynamometer, make the extensors some kilogrammes more powerful 

 than the flexors. In our various attitudes, the movements of the flexors 

 certainly prevail largely; but as the power of contraction is regulated 

 by volition, it is unnecessary to inquire, whether there be any physical 

 predominance in the flexors over the extensors, as has been attempted 

 by M. Richerand. We have already seen, that we can in no way attain 

 a knowledge of the degree of force, which any one muscle of the body 

 is capable of developing. 



TABLE OF THE MUSCLES, 



ARRANGED AFTER THE MANNER OF DR. BARCLAY, ACCORDING TO 

 THEIR ACTIONS. 



Forwards by 

 Platysma myoides, 

 Sterno-mastoideus, 

 Kectus anticus major, 

 " " minor, 



Assisted (when the lower jaw 



is fixed} by 

 Mylo-hyoideus, 

 Genio-hyoideus, 

 Genio-hyo-glossus, 

 Digastric!. 



Forwards by 

 Platysma myoides, 

 Sterno-mastoideus, 

 Digastricus, 

 Mylo-hyoideus, 

 Genio-hyoideus, 

 Genio-hyo-glossus, 

 Omo-hyoidei, 

 Sterno-hyoidei, 

 Thyro-hyoidei, 

 Rectus anticus minor, 

 Longus colli. 



THE HEAD IS MOVED 



Backwards by 

 Part of trapezius, 

 Splenius capitis, 

 Complexus, 

 Trachelo-mastoideus, 

 Rectus posticus major, 

 " " minor, 



Obliquus capitis superior. 



THE 1TECK IS MOVED 



Backwards by 

 Part of trapezius, 

 Rhomboideus minor, 

 Serratus posticus superior, 

 Splenius capitis, 



" colli, 

 Complexus, 

 Trachelo-mastoideus, 

 Transversalis colli, 

 Inter-spinales colli, 

 Semi-spinales colli, 

 Rectus posticus major, 

 " " minor, 



Obliquus capitis superior, 

 " " inferior, 



Scaleni postici, 

 Levator scapulae. 



To either side by 

 Platysma myoides, 

 Sterno-mastoideus, 

 Part of trapezius, 

 Splenius capitis, 



" colli, 



Trachelo-mastoideus, 

 Complexus. 



Laterally by 



Various combinations of those 

 muscles which separately 

 move it forwards and 

 backwards, assisted by the 

 scaleni, inter-transversales, 

 and recti laterales. 



Forwards by 

 Rectus abdominis, 

 Pyramidalis, 



Obliquus externus abdominis, 

 Obliquus internus, 

 Psoas magnus, 

 parvus, 



Assisted (when the arms are 

 carried forwards) by 



Pectoralis major, 



" minor, 



Serratus magnus. 



THE TRUNK IS MOVED 



Backwards by 

 Trapezius, 

 Rhomboideus major, 

 Latissimus dorsi, 

 Serratus posticus superior, 

 " " inferior, 



Sacro-lumbalis, 

 Longissimus dorsi, 

 Spinales dorsi, 

 Semi-spinales dorsi, 

 MuUifidus spinae, 

 Inter-transversales dorsi et 

 lumborum. 



1 Physiologic de I'Homme, 2de edit., ii. 117, Paris, 1829 ; 

 des Sciences Medicales. 



Laterally by 

 Obliquus externus, 

 " internus, 

 Quadratus lumborum, 

 Longissimus dorsi, 

 Sacro-lumbalis, 

 Serrati postici, 

 Latissimus dorsi. 



and art. Dynamometre, in Diet. 



