334 



DR. C. F. SONNTAG ON THE ANATOMY, 



the depression on the temporal bone coiresponding to the 

 digastric fossa in Man. Ohaine (10) has recently described the 

 digastric muscle. The tendon of the posterior belly tunnels the 

 stylo-hyoid muscle ; it has no direct attachment to the hyoid 

 bone as described by Gratiolet (22). 



Some fibres of omo-hyoid and sterno-hyoid pass into the 

 anterior bellies of the digastrics. 



The stylo-hyoid arises by one large and several small tendons 

 from the styloid process and bone ai-ound. It is long, thin, fleshy, 

 and wrapped round the digastric tendon. It is inserted into 

 the upper border of the hyoid bone opposite sterno-hyoid and 

 omo-hyoid. 



The mylo-hyoid (text- fig. 31, M-H) arises from the upper 

 border of the hyoid bone under cover of, but never fused with, 



Text-fisrure 31. 



RF.V. 



Anatom}' of the submental region (No. 1). A.B.D : anterior belly of the digastric 

 turned down ; A.F.V : anterior facial vein ; E.J.V : external jugular vein ; 

 L.B.T : lingual nerve; P.B.D: posterior belly of the digastric; P.F.V: 

 posterior facial vein ; S.M.G : submaxillary gland ; Sy.H : stjdo-hyoid 

 muscle ; W.D : Wharton's duct. Other letters in text. 



the anterior belly of the digastric. The level of origin corre- 

 sponds to the extent of the insertions of the sterno-hyoid and 

 omo-hyoid on the posterior border. The fibres radiate to be 

 insei'ted into the inner surface of the mandible. The posterior 

 fibres lie just in front of the submaxillary gland. Lying on the 

 surface of the muscle and supplying it are branches of the sub- 

 maxillary twigs of the external maxillary artery. I did not 

 observe any decussation of fibres in the middle line as described 

 by G-ratiolet (22). 



No submental lymphatic glands were found behind the 

 symphysis menti. 



The genio-hyoid muscles (text-fig. 31,G-H) are separated 

 anteriorly close to their origins from the lower part of the genial 

 fossa OD the back of the symphysis menti. In the greater part of 



