DISSECTION OF THE UPPER EXTREMITY 55 



Study the following: 



Superficial Nerves. (Fig. 8.) 



(a) Supraclavicular nerves (Nn. supraclaviculares) (0. T. descending 



cutaneous nerves). 



(aa) Anterior (Nn. supraclaviculares anteriores) (0. T. supra- 



sternal branches). 



(ab) Middle (Nn. supraclaviculares medii) (0. T. supraclavicu- 



lar branches). 



(ac) Posterior (Nn. supraclaviculares posteriores) (0. T. supra- 



acromial branches). 



What are their relations to the platysma? 



(b) Anterior cutaneous rami of the intercostal nerves (rami cutanei 



anteriores Nn. intercostalium). 

 (ba) Medial mammary rami (rami mam marii mediales). 



(c) Lateral cutaneous rami of the intercostal nerves (rami cutanei lat- 



erales Nn. intercostalium), dividing beneath the M. ser- 

 ratus magnus into 



(ca) Posterior rami (rami posteriores). 



(cb) Anterior rami (rami anteriores). 



Note that the latter give off the lateral mammary rami 

 (rami mammarii laterales). 

 Arteries. (Fig. 9.) 



(a) Perforating rami of internal mammary artery (rami perforantes 



A. mammarii internae). 



(aa) Mammary rami (rami mammarii). 



(ab) Muscular rami (rami musculares). 



(ac) Cutaneous rami (rami cutanei). 



(b) Anterior cutaneous rami of anterior rami of intercostal arteries 



(Rr. cutanei anteriores Er. ant. Aa. intercostalium), in 

 fourth and sixth intercostal spaces only. 

 (ba) Medial mammary rami (Er. mammarii mediales). 



(c) Lateral cutaneous rami of anterior rami of intercostal arteries (Er. 



cutanei laterales Er. ant. Aa. intercostalium). 



(ca) Posterior ramus (ramus posterior). 



(cb) Anterior ramus (ramus anterior). 



(cba) Lateral mammary' rami (Er. mammarii laterales). 



(d) Lateral thoracic artery (A. thoracalis lateralis). 



(da) External mammary rami (Er. mammarii externi). 

 Veins. 



Tributaries of the axillary vein. 



(a) Lateral thoracic vein (V. thoracalis lateralis). 



(b) Thoraco-epigastric vein (V. thoraco-epigastrica) , receiving many 



of the Vv. cutaneae pectoris. 

 Tributaries of the V. anonyma. 



(a) Tributaries of internal mammary vein. 



(aa) Perforating rami (rami perforantes). 



(ab) Intercostal veins (Vv. intercostales) (sternal extremi- 



ties). 

 Tributaries of V. azygos. 



(a) Tributaries of intercostal veins (vertebralward). 



(aa) Cutaneous veins of chest (Vv. cutaneae pectoris). 



