RESPIRATION, ORGANS OF. 



267 



tubes terminate." This really coincides with they would accurately answer to the descrip- 



the supposition of Reisseissen : "trachea? tion of the "intercellular passages" (V, ./?#. 



ramos ita per pulmones distribui, ut facta par- 210.; V, fig. 212.). It is, therefore, obvious that 



titione multiplici, singuli quique coecis nee two different minds, contemplating the same 

 ampliatis tenninentur finibus, quibus vesiculae 



aeriferae constituantur." Moleschott has 

 slightly modified the views of Reisseissen : 

 " Jam singulos ductus aeriferos, non 



Fig. 214. 



uti 



Fig. 213. 



Diagram of two lobules a, a, of the human lung. 



{After Kolliker.) 



b, b, b, b, ultimate air-cells ; c, c, the finest bron- 

 chial tubes. (Magnified 25 diameters.) 



objects under two different preconceptions, 

 would see in them " passages" or "infundibula." 

 Alung injected with wax readily misleads to the 



Fig. 215. 



An imaginary section of a lobule of the human lung, 

 carried parallel with the plane of distribution of 

 the chief interlobular divisions of the bronchi. The 

 latter are observed to multiply both on the dic/io- 

 toinous and arborescent plan. (Original.') 

 c, c, denote the smallest of the true bronchi 

 which contrast by their smooth walls the alveolated 

 intercellular passages a, a, a. The latter exceed 

 the extreme bronchules slightly in diameter. Un- 

 like these bronchules (c), which never inosculate, 

 the intercellular passages (a), ramify in every direc- 

 tion and at every plane, and frequently open into 

 one another, establishing thus a free communica- 

 tion for the air between all parts of the lobule. 

 b, b, b, indicate the ultimate air-cells of the lungs. 

 They correspond in size with the alveoli (them- 

 selves true cells) on the walls of the intercellular 

 passages, e, e, bottom of the sub-pleural or most 

 superficial air-cells. 



Reisseissen voluit, coecis nee ampliatis finibus 

 terminari dicit, verum ad latera parietalibus 

 vesiculis instructos esse testatur." Kolliker 

 adopts the views of Rossignol, and constructs 

 an illustration which expresses more perfectly 

 the views of the latter author. * 



If a series of hollow cells were disposed 

 linearly, the points of contact being converted 

 into foramina, as represented in this diagram, 



* " Mit denselben stehen dann die letzen Ele- 

 mente der Luftwege, die Luftzellen oder Lungen 



(After Rossignol.) 



b, extreme bronchial tube of the human lung 

 terminating in the "infundibula;" a, a, infundibula 

 multiplied into cells on their parietes. 



error committed by Reisseissen of supposing 

 each cell to be the separate termination of a 

 separate bronchial branch. But it is certain 



blaschen, in Verbindung, doch nicht so, wie man 

 friiher glaubte, dass jedes feinste Bronchialiistchen 

 terminal in em einziges Blaschen ausgeht, sondern 

 in dem dieselben immer mit einer ganzen Gruppe 

 von Blaschen sich vereinen. Diese Blaschengrup- 

 pen entsprechen den kleinsten Lappchen trau- 

 benformiger Driisen, und es ist daher nicht die 

 geringste Nothigung vorhanden, dieselben mit 

 einem andern Namen zu bezeichnen, wie Rossignol 

 der sie infundibula nennr, wenn auch zu/ugeben ist, 

 dass ihr Bau in manchen eigenthiimlirh sich ver- 

 hiilt. Wahrend namlich in andern Driisen die 

 Drusenblaschen, wenn sie auch nicht so isolirt f iir 

 sich bestehen, wie man bisher angenommen hat, 

 doch eine gewisse Selbstandigheit liaben sind, die 

 ihnen entsprechen Elemente in den Lungen, die 

 Luftzellen, in bedeuten Grade untereinander ver- 

 schmolzen, so dass alle einem Lappchen angehori- 

 gen Blaschen nicht in Abzweigungen der zu dem- 

 selben tretenden feinsten Bronchialastchen, sondern 

 in einem gemeinsauien Hohlraum einmiinden ana 

 dem dann erst das Luftgefiiss sich cntvickelt." 

 Mic. Anat., Zweiten Halfe, p. 309. 



