548 



MUSCLE-NERVE PHYSIOLOGY 



TABLE OF THE SEVERAL GROUPS OF THE INTRINSIC MUSCLES OF THE LARYNX AND 

 THEIR ATTACHMENTS. Continued. 



Nerve Supply. The sensory filaments of the superior laryngeal branch of 

 the vagus supply the epithelial lining of the larynx, giving it that acute sensi- 

 bility by which the glottis is guarded against the ingress of foreign bodies, 

 or of irrespirable gases. The contact of these stimulates the nerve endings; 

 and the sensory nerve impulse conveyed to the medulla oblongata, whether 

 accompanied by sensation or not, arouses motor impulses through the fila- 

 ments of the recurrent or inferior laryngeal branch, which excite contraction of 



