1584 



HUMAN ANATOMY. 



point, the gland appears on the surface. It projects but Httle, if at all, on the outer 

 side of the jaw, but curls around the posterior border of the mylo-hyoid muscle 

 and extends for some distance in the floor of the mouth, under the mucous mem- 

 brane, in the angle between the mylo-hyoid and the hyo-glossus, sometimes reach- 

 ing the sublingual gland (Fig. 1344). It lies in a capsule derived from the cervical 

 fascia, which is so loosely attached that the gland can easily be isolated. The 

 anterior end of the posterior belly of the digastric and of the stylo-hyoid pass behind 

 and beneath it. The hypoglossal nerve and the lingual vein lie beneath it, as does 

 the first part of the lingual artery, until the latter passes under the hyo-glossus. 

 Its sublingual branch runs along the inner side of the prolongation of the gland,. 



Fig. 1344. 



Accessory parotid gland 



Parotid duct 

 V Masseter 



Parotid gland 



Internal pterygoid 

 (cut) 

 Superior constrictor^ 

 Digastric 

 Stylo-hyoid 

 Stylo-glossus 



Stylo-pharyngeus — 

 Occipital artery 



Internal carotid 



Middle constrictor 



Facial artery 



External carotid 

 Lingual artery—- 



Superior thyroid_ 

 artery 



Inferior constrictor 



Buccinatoi 



^Lingual 

 nerve 



Facial artery 



Oral mucous 



membrane 



Deeper portion of sub- 

 maxillary gland 



Cut mandible 



Submaxillary duct 



Sublingual gland 



. Genio-glossus 



\MyIo-hyoid (cut) 

 Genio-hyoid 



Stump of digastric, anterior belly 

 Submental artery 

 Submaxillary gland, superficial part 



Great cornu of hyoid bone 

 Hyo-glossus 

 rhyro-hyoid 

 Deeper dissection, showing relations of salivary glands. 



to which it sends vessels. The facial artery lies beneath the gland before reaching 

 the border of the jaw. The facial vein is superficial to it. The lingual nerve lies 

 above the prolongation. 



The submaxillary or ^A^ha^ton's duct runs from the front of the main body 

 of the gland along the floor of the mouth under the mucous membrane, often accom- 

 panied externally by the prolongation of the gland. It is from 4-5 cm. long, with a 

 diameter of 3 mm. Its walls are decidedly thinner than those of the parotid duct. 

 Anteriorly it rises to open into the mouth by a little papilla on the side of the frenum 

 linguae, the last few millimetres running in a fold of mucous membrane. The lingual 

 nerve passes under the duct from without inward soon after it leaves the gland. 

 The sublingual artery is beside it and a plexus of veins around it. 



