1 3 o BIOLOGICAL PHYSICS 



visceral areas, and vice versa a doctrine which affords a 

 ready and clear explanation of many puzzling bacterio- 

 logical and chemico-physiological problems in the etiology 



FIG. 55. DIAGRAM OF THE ROOTS AND ANASTOMOSING BRANCHES OF 



THE PNEUMO-GASTKIC ANO NEIGHBOURING NERVES. (From Sappey, 



after Hirschfeld and Leveilte.) 



i, facial nerve ; 2, gloso-pharyngeal with the petrous ganglion ; 2', connection of the 

 digastric branch of the facial nerve with the glo^so pharyngeal nerve ; 3, pneumo- 

 gastric, with its two ganglia ; 4, spinal accessory; 5. hypoglossal ; 6, superior 

 cervical ganglion of the s\ mpathetic ; 7, 7, loop of union between the first two 

 cervical nerves ; 7, carotid branch of the sympathetic ; 9, nerve of Jacobson 

 (tympanic), given off from the petrous ganglion ; 10. its filaments to the sympa- 

 thetic ; n, twig to the Eustachian tube ; 12, twig to the fenestra ovalis ; 13, twig 

 to the fenestra rotunda ; 14, small superficial petrosal nerve ; 15, large superficial 

 petrosal nerve; 16, otic ganglion; 17, auricular branch of the pneumo-gastric ; 

 18, connection of the spinal accessory with the pneumo-gastric ; 19, union of the 

 hypoglossal with the first cervical nerve ; 20, union between the sterno-mastoid 

 branch of the spinal accessory and that of the second cervical nerve ; 21, pharyn- 

 geal plexus ; 22, superior laryngeal nerve ; 23, external laryngeal ; 24, middle 

 cervical ganglion of the sympathetic. 



and pathological sequence of morbid events, and a means 

 of linking up the morbid elements of many apparently 

 disunited and incongruous pathological states of both head 

 and trunk. Thus the simultaneous, or immediately con- 

 secutive, presence of similar bacterial organisms, such as 



