MUSCLES OF THE SKIN. 



119 



sixth, and ninth will adduct towards this line. If we compare 

 them with those of man (in whose case the second toe affords the 

 central line), those of the first group must be regarded as mm. inter- 

 oissei dorsales, of the latter as plant ares. Duges holds all these 

 interossei (with the exception of the first, abductor brevis dig. 1) to 

 be mm. interossei r/or,?fl/t^i' (metatarso-sus-phalangettiens, n. 210, 211, 

 212, 214, 215, 216, 218, 219). Those which I have described as 

 flexores projjrii diffitornm, he regards as interossei volares. 



V. MUSCLES OF THE SKIN. 



196. 31. cutaneus pectoris (Fig. 95 cp). 



Duges, abdomino-guttural, u. 53. — Klein, abdomino-cutaneus. — Zenker, 

 subcutaneus pectoris. 



This is an elongated quadrangular muscle, attached by its hinder 

 margin to the side of the xiphisternum, and to the superficial 

 surface of the aponeurosis of the m. obliquiis externas. The fibres 

 course forwards and 



Fit 



95- 



slightly outwards to be 

 inserted, at a very acute 

 angle, into the skin : lying* 

 between the two muscles 

 and attached to them on 

 either side is a thin fas- 

 cia, which, together with 

 the muscles and the sep- 

 tum tJioracicum, assists in 

 closing a triangular space 

 between these structures 

 and the deeper muscles. 



The thinness and trans- 

 parency of this muscle 

 render it especially suit- 

 able for the investigation 

 of nerve-temiinations ^. 



197. M. cutaneus dorsi (Fig. 96 cd). 



Duges, pubio-dorso-cutane, n. 56. — Zenker, cutaneus iliacus. 

 This muscle has a narrow origin in the space between the muscles 



' Kolliker, Mikrosk. Anatomie, 1866, vol. II. i, p. 247 ; Reichert, Miiller's Archiv, 

 1851, p. 29, PI. I ; Kolliker, Untersuchungen iiber die letzten Endigungen der Nerven 

 in den Muskeln des Frosches ; Leipzig, Engelmann, 1862. 



Pectoral region of Raita escuknla. 



cp M. cutaneus pectoris. 



p"' Port, abdominalis of the m. i)ectoralis. 



