O CONTENTS. 



CHAPTER III. 



GENEBAL PEOPEETIE8 OF THE NEEVE8. 



Nervous irritability Different means employed for exciting the nerves Disap- 

 pearance of the irritability of the motor and sensory nerves after exsection 

 Nerve-force Non-identity of nerve-force with electricity Rapidity of 

 nervous conduction Estimation of the duration of acts involving the nerve- 

 centres Action of electricity upon the nerves Contrasted action of the 

 direct and the inverse current on closing and opening the circuit Voltaic 

 alternations Induced muscular contraction Galvanic current from the 

 exterior to the cut surface of a nerve Effects' of a constant galvanic cur- 

 rent upon the nervous irritability Electrotonus, anelectrotonus, and cathe- 

 lectrotonus Neutral point Negative variation, .... Page 91 



CHAPTER IV. 



SPINAL NEEVES MOTOB NEBVES OF THE EYEBALL. 



Special nerves coming from the spinal cord Cranial nerves Anatomical classi- 

 fication Physiological classification Motor oculi communis (third nerve) 

 Physiological anatomy Properties and functions Influence upon cer- 

 tain muscles of the eyeball Action of the inferior oblique muscle Influ- 

 ence upon the movements of the iris Patheticus, or trochlearis (fourth 

 nerve) Physiological anatomy Properties and functions Action of the 

 superior oblique muscle Motor oculi externus, or abducens (sixth nenre) 

 Physiological anatomy Properties and functions, . . .122 



CHAPTER V. 



MOTOB NEBVES OF THE FACE. 



Nerve of mastication (the small, or motor root of the fifth) Physiological anat- 

 omy Deep origin Distribution Properties and functions of the nerve 

 of mastication Facial nerve, or nerve of expression (the portio dura of the 

 seventh) Physiological anatomy Intermediary nerve of Wrisberg De- 

 cussation of the fibres of origin of the facial Alternate paralysis Course 

 and distribution of the facial Anastomoses with sensitive nerves Summary 

 of the anastomoses and distribution of the facial Properties and functions 

 of the facial Functions of the branches of the facial within the aqueduct 

 of Fallopius Functions of the chorda tympani Influence of various 

 branches of the facial upon the movements of the palate and uvula Func- 

 tions of the external branches of the facial, 139 



