ElylSHA MITCHELL SCIENTIFIC SOCIETY. 17 



chiaV)', ^ectoralis, -part /., M., p. 145; pectoralis, -part 

 a, G. & T., p. 30. 



There is no actual union, in cases at least, between 

 the muscular part of the distal end of the slip from the 

 third pectoral and the cpitrochlear, as W. & G. state 

 (p. 238). The slip is in close juxtaposition to the epi- 

 trochlear along- it's posterior border. 



The oriofin of the muscle, as g-iven by Mivart, is in- 

 accurate: "from beneath the manubrium and attach- 

 ment of the first two costal cartilages." Gorham and 

 Tower g*ive the same orig^in as Mivart. 



The second pectoral is a wnder muscle than the first. 

 It is superficial just in front and just behind the first, 

 but the greater part of it is covered by the latter. It 

 arises from the presternum and the median raphe, above 

 referred to. The muscle arises from the mid-ventral 

 line of the presternum along the entire length of the 

 latter. The anterior portion arising from the raphe is 

 noticeably thicker than the rest of the muscle. 



The chief insertion is on the outer surface of the hu- 

 merus, along the middle third of that bone, external to 

 the attachment of the third pectoral. The fibres ly- 

 ing along the posterior border of the muscle are in- 

 serted into the bicipital arch. 



Synonymy. Premier chef dii large pectoral, S.-D., 

 vol. II, p. 343; lamina ectalis of the ectopectoralis, W. 

 & G., p. 'z^2)S\ pectoralis, part j (partially), M., p. 147; 

 pectoralis, part e (partially), G. & T., p. 31. 



Mivart's part j apparently only corresponds to the 

 anterior portion of our second pectoral. M. is inaccu- 

 rate regarding the origin, which he says is from the ma- 

 nubrium: ''The ffth ^ " is the most anterior. It arises 

 from the manubrium." The origin from the median 



