DISSECTION OF THE THORAX 



401 



Intercostal Vessels. 

 Study- 



(a) Highest intercostal artery (A. intercostalis suprema), from the 



truncus costocervicalis of the A. subclavia. 



(aa) Dorsal rami (rami dorsales). 



(ab) Spinal rami (rami spinales). 



(b) Intercostal arteries (Aa. intercostales) (vide Fig. 198), from the 



aorta thoracalis, and hence often called " aortic intercostal 

 arteries." The posterior relations and posterior branches 

 may be better studied later. 



FIG. 199. 

 Muscle twig of the ramus posterior of the A. intercostalis 



Ramus cutaneus dorsalis (lateralis) 

 ! Ramus dorsalis of the 



anterior branch of the A. intercostalis 



M. Hiocostalis 



Muscle-layer of the trunk, for 



the upper extremity 

 M. intercostalis externus 



The branch of the A. in- 

 tercostalis, which runs 

 along the next 

 lower rib A. inter- 

 costalis 

 . M. subcostalis 



..M. intercostalis 

 internus 



Ramus visceralis 



M. longissimus dorsi 



Mm. multifidus and semispinalis 



Rami cutanei dorsales 

 (mediales) 



Ramus 



Ramus posterior of 

 A. intercostalis 



Ramus dorsalis of 

 the anterior branch 

 of the A. intercostsilis / 

 Ramus anterior of the 

 A. intercostalis 



A. intercostalis 



Aorta thoracalis- 



Arteriae mediastinales anteriores 



Ramus posterior 



. Ramus anterior 



Ramus cutaneus latera- 

 lis (pectoralis) 



Ramus intercostalis 

 If. fr<ntr<rnii.< Dnmti'i* 

 A. mammaria interna 

 Ramus perforans 



Rami sternales 



The branching of the arteries of the body-wall. Schematically represented in a segment of the 

 thorax. (After Toldt, Anat. Atlas, Wien, 1900, 2 AufL, p. 571, Fig. 947.) 



(ba) Posterior rami (rami posteriores) . 



(baa) Spinal ramus (ramus spinalis). 



(bab) Muscular rami (rami musculares). 



(bac) Medial cutaneous ramus (ramus cutaneus medialis). 



(bad) Lateral cutaneous ramus (ramus cutaneus lateralis). 



(bb) Anterior rami (rami anteriores). 



(bba) Muscular rami (rami musculares). 

 2G 



