Dissection of Bheep's Head. 227 



three quarters in advance of the Submaxillary ganglion, and 

 disappearing beneath the duct soon after. 



The Sublingual is the smallest of the salivary glands, and 

 is of a narrow oblong shape, situated between the two 

 branches of the Gustatory nerve posteriorly, and between the 

 upper branch and the Whartonian duct anteriorly ; the lower 

 branch of the Gustatory bending upwards internally to the 

 gland about the middle of its length. The principal duct 

 should be followed forwards, and at a point about three 

 quarters of an inch from the papilla at its termination it will 

 be seen to be crossed by the superior branch of the Gustatory 

 nerve, and from the same point to become enclosed in the 

 same sheath with the Whartonian duct, to the end of its 

 course. A bristle passed along this duct will, however, shew 

 that in many cases the two ducts remain distinct in the sheath, 

 and open separately in the mouth ; though in many cases the 

 two ducts blend before opening into the mouth. This single 

 canal from the Sublingual gland, entering the mouth an- 

 teriorly, is known as the duct of BarthoUni; the several 

 smaller ducts which unite to form the single canal being 

 called the ducts of Rivini. 



Of the three salivary glands now seen, the Submaxillary is 

 said to be the first formed in the Mammalian foetus ; then 

 the Sublingual, and lastly the Parotid. 



Investigatiox of the Chain of Hyoid Bones. The 

 Student will do well now to raise the Pterygoid muscle and 

 that part of the ramus of the jaw which remains in situ, and 

 stretch it over towards the top of the skull b}^ hooks, in order 

 to expose the Stylo-hyal bone, with the muscles thereto 

 attached. 



Before noticing the muscles connected with the Os Hj^oides 

 more particularly, it may be well to direct the attention to its 

 osseous framework. The Hyoid bone is made up* of a 



* Cyc. Anat, S., art. Ruminantia. 



