14{) 



THE CAT. 



[chap. v. 



one side act alone, the whole backbone is flexed towards the side of 

 such action. 



The Jcratorcs costarum are small groups of fibres passing obliquely 

 backwards from the dorsal transverse processes to the respective ribs 

 at their proximal parts. 



Layers of fibres extending obliquely from rib to rib are called 

 " intercostal muscles," and there are two sets of them, one inner, 

 the other outer (Fig. 78). 



The external infercosiaJs are more dorsally situated, since each 



rig. 7i'.— Mc'scXES OF Ventral Surfack of Trunk— the lkft 1"ori:-i.i.mii and i.ekt rECTORAi 



Muscles beinc; removed. 



CM. Cli'ido-inastoid. 



Ci'. Clavicle. 



J)\ Dc-Uoid. 



F,d. ExU'i'iml ilorso-i'jiitroclili'iir. 



Exo. Extcniiil (il)lic[m'. 



/(/. Iiitunial (liiiso-cpitrodilcav. 



Jo. IiitiTiuil ol)li(iue. 



JaI. Liilissiiim.s dorsi. 



yi, i'-, and l'\ Pfi-torali.s. 



11. I\0ctus alidiiininis. 

 .sv'. Scak'iius ]ii'iiMUs. 

 .s'c^. Scalenus seeuiidus 

 .S7ii/. Stenio-liyi)id. 

 Sm. Serratus iiiagmis. 

 .S'fi. Stenialis. 

 .S7*. Second .stcnialis. 

 St. m. Stenio-nmstoid. 



such intercostal connects two ribs, all the M-ay from their tubercles 

 to their cartilages. Their fibres are directed backwards and down- 

 wards (i). 



The internal intcrcostah have their fibres directed backwards^ and 

 upwards, and the sheet of such fibres which connects each pair of 

 ribs reaches from the sternum upwards as far as the angles of the 



