ANATOMY IX A NUTSHELL. 315 



and the Inferior constrictor gets, in addition, branches from the external laryn- 

 geal nerve and the recurrent laryngeal. The Palato-pharyngeus probably 

 gets its nerve supply from the internal branch of the spinal accessory, whose 

 fibers are distributed along with certain branches of the pneumogastric through 

 the pharyngeal plexus. 



The pharyngeal plexus is formed by branches of the vagus, sympathetic and 

 glossc-pharyngeal. It supplies the muscles and mucous membrane of the 

 pharynx. 



The blood supply of the pharynx is from the superior thyroid branches, 

 ascending pharyngeal, pterygopalatine, and descending palatine. The first 

 two are branches of the external carotid, the last two are branches of the internal 

 maxillary. 



The sinus of 3Iorgagni is a space at the upper and back part of the Superior 

 constrictor of the pharynx, just under the base of the skull where the muscular 

 fibers of the Constrictor are deficient, the pharynx being consequently walled 

 in behind by its own aponeurosis. Here the Eustachian tube opens into the 

 pharynx, one on each side. 



LESSON LXXXIX. 



The tonsils (Plate CXXXIX) are two prominent oval bodies situated in there- 

 cesses formed one on each side of the fauces, between the anterior and pos- 

 terior palatine arches. They are composed of lymphoid follicles, surrounded by 

 less dense lymphoid tissue arranged around the walls of crypts. They lie near 

 the internal carotid artery. The blood supply is from the dorsalis lingua? from 

 the lingual; ascending pharyngeal from external carotid; ascending palatine 

 from facial ; tonsillar from facial : descending palatine from internal maxillary. 

 (Plate CXVI) The veins of the tonsil form a plexus which lies upon the outer side 

 of the gland and opens externally into the pharyngeal plexus. The nerves to 

 the tonsils come from the fifth by means of Meckel's ganglion and from the 

 glosso-pharyngeal nerve. 



Steno's duct (Stenson's) (Plate CXL) is a duct of the parotid gland convey- 

 ing saliva into the mouth; so named from the Danish anatomist, Nicholas Steno, 

 of Copenhagen (1638-86). This duct is also called parotid duct. 



Wharton's duct named from Thomas Wharton, an English physician, 1656. 

 The duct of the submaxillary gland, conveying saliva into the mouth, about 

 two inches long, opening on a papilla at the sideof the fraenum linguae, or bridle 

 of the tongue. 



The ducts of Rivinus are those ducts of the sublingual gland which open 

 apart from one another and from Wharton's duct. 



The duct of Bartholin is one of the ducts of the sublingual gland running 

 along side of Wharton's duct, and opening into it or close to its orifice into the 

 mouth. 



Thehardpalate(PlateCC.WYIII) isin the roof of the mouth and is formed by 

 the palate processes of the superior maxillary and palate bones. The soft palate 

 is a movable fold suspended from the posterior bonier of the hard palate, form- 



