9 



PRACTICAL ANATOMY. 



muscular branches of the internal maxillary artery and take the name of the 

 muscles. 



2. The auriculo-temporal nerve. (Fig. 53.) The middle meningeal artery 

 passes between the two roots of this nerve. This nerve gives an articular 

 branch to the temporo-mandibular articulation. It does this in accordance with 

 Hilton's law. It gives branches to the external auditory meatus and the 

 membrana tympani, and is often responsible for ear-ache in children. It sends 

 branches to the scalp, with the temporal arteries, and may be the terminus of 

 visceral reflexes in the scalp. 



3. The inferior dental nerve to (i) the teeth of the mandible ; (2) to the skin 

 of the chin (mental nerve) ; (3) to the anterior belly of the digastric ; and (4) to 

 the mylo-hyoid muscle, through the mylo-hyoid nerve. 



4. The gustatory or lingual nerve, the great sensory nerve to the tongue. 

 It anastomoses in the tongue with the hypoglossal and the glossal branch of the 

 glosso-pharyngeal nerve. Special notice must be given this nerve, on account 



STHOID PROCESS 



I'llURltA TYMI'AXI .VAV.'IV-; 



ui'tiTA r/:y 



SUBMAXILLARY 

 GANGLION 



DUCT OF SUBMAXILLARY GLAND 



rtESCBKDENS XnXl 

 NKRVK 



Fie. 54. MUSCLES, VKSSKI.S, AND NERVES OK THE TONGUE. 



of (i) the chorda tympani nerve; (2) the submaxillary ganglion ; (3) the otic 

 ganglion. 



The chorda tympani nerve (Fig. 54) is a branch of the seventh cranial 

 nerve. 'It passes through the tympanum. It leaves this cavity by the canal 

 of Huguier in the petrous portion of the temporal bone. It passes between the 

 two pterygoid muscles. It meets the lingual nerve, and accompanies this to 

 the submaxillary gland. This nerve gives branches to the sublingual gland, the 

 lingualis muscle, and the submaxillary ganglion. 



The Submaxillary Ganglion. (Fig. 54.) 



Give location of the submaxillary ganglion. 



It is on the outer surface of the hyo-glossus muscle, attached to the gustatory 

 or lingual nerve. The ganglio'n is about the size of a pin's head. 



Name the roots of the ganglion and give their source. 



1 . Sensory root is from the gustatory nerve, a branch of the fifth nerve. 



2. Motor root is from the chorda tympani, a branch of the seventh nerve. 



3. Svwpathctic root is from the nervi molles the facial sympathetics. 



