THORAX. 137 



1. Great serratus. — Synonyms. Costo-siibscapu- 

 laris, (G). Posterior portion of the serratus magniis, 

 (P). Attachments : The external face of the eight 

 true ribs, the anterior and posterior triangular surfaces 

 of the internal face of the scapula. Action : Suspen- 

 sor of the trunk, and may act as inspirator. 



2. Transverse of the ribs. — Synonyms. Costo- 

 sternalis, (G). Lateralis sterni, (P). Attachments : 

 Sternum, fourth costal cartilage and external face of 

 the first rib. Action : Expiratory. 



3. Seventeen external intercostals. — Attach- 

 ments : Posterior border of the preceding to external 

 face of succeeding rib. Action : Inspiratory. 



4. Seventeen internal intercostals. — Attach- 

 ments : Anterior border of the posterior to posterior 

 border and internal face of the anterior rib. Action : 

 Expiratory. 



5. Seventeen supercostals. — Synonyms. Trans- 

 verso-costalis, (G). Levatores costarum, (P). Attach- 

 ments: Trans\^erse processes of the dorsal vertebrae 

 and external face of the ribs. Action : Inspiratory. 



6. Triangularis of the sternum. — Synonyms. Ster- 

 no-costalis, (G). Sterno-costalis, (P). Attachments : 

 Superior face of the sternum and internal face of the 

 cartilages of the true ribs except the first. Action : 

 Expiratory. 



