326 Proceedings of the Boyal Physical Society. 



than the lower lid, so that by irritation of the sympathetic 

 the latter is drawn back in a more marked manner than the 

 former. Narrowing of the palpebral fissure, after section of 

 the cervical sympathetic, depends upon relaxation of these 

 muscles. Yet recession of the eye-ball may depend upon 

 relaxation of the orbital muscle. Miiller, then, concludes 

 that the movements occasioned by experimenting on the 

 cervical sympathetic are not such as -to entitle us to infer 

 an influence of that nerve upon voluntary striped muscles. 

 He also considers that the movements about the nose and 

 mouth, said by Bernard to be produced by section of the 

 sympathetic, if they do take place, are owing to the presence 

 of unstriped cutaneous muscles. 



Miiller next inquires into the existence of unstriped 

 muscles in the skin of the ear. He has occasionally found, 

 on galvanizing the cervical sympathetic in cats, that a move- 

 ment of the hairs growing upon the skin at the entrance of 

 the concha has taken place. This experiment has, how- 

 ever, frequently failed both in cats and other animals. A 

 careful examination of the skin of the part did not give any 

 indications of unstriped muscles, but very distinct muscles 

 were seen connected to the hair follicles. He considers 

 these experiments of interest, as they appear to indicate 

 whence the muscles of the hair follicles receive their nerves. 

 Owing to the movement of the hairs being limited to a very 

 small locality, during the irritation of the sympathetic, one 

 must suppose that only a very small part of the unstriped 

 muscular apparatus of the skin of the cat can be regulated 

 by the cervical sympathetic. 



Notes on the Occurrence of the Musculus Kerato-cricoideus. 

 — In a paper, entitled " Eemarks on the Musculus Kerato- 

 cricoideus (Merkel's Muscle)/' read to this Society in Janu- 

 ary 1860 (see Proa, vol. ii. part 1, page 135), I directed 

 attention to an account which had been given by Dr Carl 

 Merkel of Leipsic (Stimm und Sprach-Organ, 1857), of a 

 hitherto undescribed muscle of the human larynx. Merkel 

 described this muscle as arising from the posterior surface 

 of the cricoid cartilage, and extending obliquely upwards 



