I2O 



BIOLOGICAL PHYSICS 



exosmose, their superabundant fluid into the inter-spaces 

 of the dura mater behind and below the petrous processes 

 of the temporal bones where it finds a means of circulatory 

 disposal into the extra-dural lymph spaces of the spinal 

 cavity. We take it, also, that a portion of -the intra- 

 auditory lymph finds its way by osmosis into the cavity 

 of the middle ear, where it moistens and lubricates the 



FIG. 42. DIAGRAMMATIC SKETCH FROM BEHIND OF THE ROOTS OF 

 THE NINTH, TENTH, AND ELEVENTH NERVES, WITH THEIR GANGLIA 

 AND COMMUNICATIONS. (From Bendz.) 



A, part of the cerebellum above the fourth ventricle ; B, medulla oblongata ; C, spinal 

 cord; i, glosso-pharyngeal nerve ; 2, pneumo-gastric ; 3, 3, 3, spinal accessory ; 

 4, jugular ganglion of the glosso-pharyngeal ; 5, petrous ganglion ; 6, tympanic 

 branch ; 7, ganglion of the root of the pneumo-gastric ; 8, auricular branch ; 

 9, ganglion of the trunk of the pneumo-gastric; 10, branch from the upper 

 ganglion to the petrous ganglion of the glosso-pharyngeal ; u, inner portion of 

 the spinal accessory ; 12, outer portion ; 13, pharyngeal branch of the pneumo- 

 gastric ; 14, 14, superior laryngeal branch ; 15, twigs connected with the sympa- 

 thetic ; 16, internal part of the spinal accessory prolonged with the pneumo-gastric. 



structures therein and finds a means of exit along the 

 Eustachian tubes into the pharynx, the fenestra rotunda^ 

 and what remains of the fenestra ovalis uncovered, or 

 unoccupied by its attachment to the stapes, constituting 

 the main routes by which the two main lymph reservoirs, 

 or cisterns, of the cochlea and semicircular canals 

 respectively relieve themselves, according to the exigencies 

 of intra-otic pressure. A singular and suggestive pheno- 

 menon, somewhat, akin to that observed in the pineal 



