PLATE XLI. % 



THE SIDE OF THE NECK WITH THE STERNO-MASTOID 



MUSCLE REMOVED. 



In this dissection, which is a deeper one on the same subject as plates 89 and 40, 

 the sterno-mastoid muscle has been cut across its centre and the upper half turned up 

 and left to show the course of the spinal accessory nerve, while the lower part with the 

 inner half of the clavicle 

 has been removed. Thus 

 the two triangles have 

 been thrown into one. 



The accompanying 

 diagram has been intro- 

 duced to show the 

 structures covered by the 

 sterno-mastoid muscle. 

 They are : 

 Muscles. Sterno-hyoid 



and thyroid, scalenusan- 



ticus and medius, rectus 



capitis anticus major, 



splenius, levator anguli 



scapula 1 ; i4ric, 



omo - hyoid, edge of 



thyro-hyoid, inferior 



constrictor of the 



pharynx, deep cervical 



fascia. 



Vessels. Common, ex- 

 ternal, internal carotids, 



superior thyroid and its 



t-turno-mastoid branch, 



facial, lingual, occipital, 



posterior auricular, thy- 

 roid axis and its 



branches, inferior thy- 

 roid with the ascendin" ' s l linal accessory. 2. Small occipital. 3. Great auricular. 4. Super- 

 ficial cervical. 5. Supra-clavicular. 6, 7, 8. Cords of brachial 



cervical, transverse cer- p | exus . 9 . Twigs from ftnsa hy pOR 'ossi. 10. Hypoglossal. 



vical, supra -scapular ; The phrenic nerve has unfortunately been missed out in the diagram, 

 internal jugular, facial 



and superior thyroid, middle thyroid, anterior jugular and external jugular veins. 

 ; - Hypoglossal, spinal accessory, descendens noni or cervicis, ansa hypoglossi and 

 communicans noni ; the roots of the cervical and brachial plexuses, 

 phrenic and facial, small occipital, great auricular, superficial cervical, 

 supra-clavicular nerves. 



Glands. Parotid and deep lymphatic glands. 



Bones. Mastoid process, transverse processes of the cervical vertebrae, sternum. 

 Joint. - Sterno-clavicular. 



