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LABORATORY MANUAL OF HUMAN ANATOMY 



enclosed in a tough sheath (prolongation of fascia praeverte- 

 bralis). 



Clean the axillary blood-vessels carefully and study them. 

 Into what three parts is it customary arbitrarily to subdivide 



Cviii 



ci 



Plexus cervicobrachialis. (After P. Eisler, from Rauber's Text-Book.) Ventral view. 

 h, N. hypoglossus; dh, ramus descendens N. hypoglossi, which, along with dc, the ramus de- 

 scendens cervicalis, forms the ansa hypoglossi ; om, N. occipitalis minor ; au, N. auricularis magnus ; 

 sec, N. cutaneus colli ; a, to N. accessorius ; spc, Nn. supraclaviculares ; p, N. phrenicus ; ds, N. dorsalis 

 scapulae; sps, N. suprascapularis ; ss, Nn. subscapulares ; sc, N. subclavius; ax, N. axillaris; co, N. 

 to M. coracobrachialis ; It, N. radialis; me, N. musculocutaneus ; M, N. medianus; ta, Nn. thoracales 

 anteriores ; tt, N. thoracalis longus ; U, N. ulnaris ; cm, N. cutaneus antibrachii medialis ; ci, N. cutaneus 

 brachii medialis ; ih, N. intercostobrachialis. (From Barker, The Nervous System, New York, 1899, p. 

 324, Fig. 186.) 



the axillary artery? Study the relations of each of these three 

 portions. What branches come from the first portion? What 

 from the second! What from the third! Clean each of these 



