HUMAN ANATOMY. 



point the gland appears on the surface. It projects but little, 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. I he 

 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 

 Masseter 



Buccinator 



Parotid glan 



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- 



Lingual 

 nerve 



Facial artery 



Oral mucous 

 membrane 



Deeper portion of sub- 



maxillary gland 

 Cut mandible 

 Submaxillary duct 

 .Sublingual gland 



^ ^ Genio-glossus 

 \Mylp-hyoid (cut) 



Genio-hyoid 



Stump of digastric, anterior belly 

 'Submental artery 

 Submaxillary gland, superficial part 



\ Great cornu of hyoid bone 



Hyo-glossus 

 Thyro-hyoid 

 Deeper dissection, showing relations of salivary glands. 



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

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

 above the prolongation. 



1 In Submaxillary or Wharton's duct runs from the front of the main body 

 of tin- ^1. ind alon^ the tloor 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 ;, nun. Its walls an- decidedly thinner than those of the parotid duct. 

 Anteriorly it rises to open into the month l>y a little papilla on the side of the frenum 

 lintMi.i-, the last feu millimetres running in a fold of mucous membrane. The lingual 

 nerve pas-M-s 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. 



