434 



ANATOMY FOR NURSES 



[Chap. XX 



Taste 



Tongue 



1. Taste-buds are end organs. 

 Sensory &p- 2. Nerve-fibres of trifacial, facial, and glos- 

 paratus | sopharyngeal nerves. 



. 3. Centre in brain. 

 Solution of sapid substances must come in contact with 

 taste-buds. 



(Surface of tongue. 

 Soft palate and fauces. 

 Tonsils and pharynx. 



Freely movable muscular organ. 



Attached to hyoid bone, epiglottis, and pillars of the fauces. 



ICircumvallate. 

 Fungiform. 

 Filiform. 

 ■ Lingual, branch of trifacial. 



Nerves 



Sense of 



Sensory 



Motor — 



1. Taste 



2. Temperature 



3. Pressure 



4. Pain 



Chorda tympani, branch of the 



facial. 

 Glossopharyngeal. 

 Hypoglossal. 



Are all well developed. 



Smell 



Hearing 



C Olfactory nerve-endings. 

 Sensory ap- olfactory nerve-fibres. 



para us |^ Centre in brain — olfactory bulb. 



I Minute particles of ( Must be capable 

 solid matter < of solution in 



Gases I mucus. 



Olfactory nerve-ending found in lining upper part of nose 



(smell). 

 Branches of trigeminal nerve found in lining of lower part 

 of nose (pressure). 



' External ear. 

 Middle ear. 

 Auditory ap- < Internal ear. 

 paratus Auditory nerve. 



. Centre in brain. 

 Air-waves enter external auditory canal and cause vibra- 

 tions of drum-nicmbrane. The \4brations are conveyed 

 to nerve-endings of organ of Corti, and thence by the 

 auditory nerve to the brain. 



