26 ELEMENTAKT PHYSIOLOGY. [L 



6. In the dog, reflect the skin, of the head, note 

 again the position of the subnmxillary gland 

 (cp. C. § 28 d.) as seen from the surface; it lies 

 between two large branches of the jugular vein ; 

 attached to the inner part of the posterior 

 extremity of the lower jaw •will be seen the 

 digastric muscle; clear away the connective 

 tissue surrounding it, cut it through, taking 

 care not to injure the parts beneath, and 

 reflect the cut ends; the suhrrmxillary duct 

 (duct of Wharton) will be seen running from 

 the gland, trace it forwards, it runs underneath 

 (dorsaUy of J a muscle with transverse flbres, the 

 mylohyoid, cut through this, turn the lateral 

 part as far back as possible, taking care that 

 the fascia on its lower surface is not attached 

 to it and follow the duct forwards. 



7. Attached to the anterior end of the submaxillary 

 gland and stretching for some little way along 

 its duct will be seen the^ smaller subliTigiial 

 gland, from this runs the sublingiud duct, 

 alongside and laterally of the duct of the 

 submaxillary gland. 



8. A short distance from the lower border of the 

 mylohyoid muscle the lingual nerve will be seen 

 crossing the ducts and running on to the tongue : 

 puU the tissues on which the lingual rests well 

 away from the jaw, about three quarters of an 

 inch centrally of the point where the lingual 

 crosses the ducts, it will be seen to give oflf a 

 small nerve the chorda tympani. This curves 

 towards the ducts and then runs alongside them 

 towards the sublingual and submaxillary glands. 



