( 708 ) 
to consider the organon vomeronasale as a special senseorgan of 
which the function is unknown, while the duality seen in the 
central tracts belonging to the rhinencephalon finds its source in the 
anatomical independence between the system of the olfactory nerves 
and the system of nerves belonging to the organon vomeronasale. 
My thanks to Prof. J. W. LANGELAAN under whose direction these 
researches were made. 
Anatomy. — “Note on the Innervation of the Trunkmyotome”. 
By J. W. vay Bissenick. (From the Anatomical Institute at 
Leiden). (Communicated by Prof. T. Prace). 
These researches form a sequel to professor LANGELAAN’S first 
communication “On the Form of the Trunkmyotome”*), and were 
performed under his direction in the anatomical institute at Leiden. 
The aim of this research was to know if one single spinal nerve 
innervates only one single myotome. 
The method followed, existed in dissecting a spinal nerve and to 
see if the different territories to which the nervestrands can be 
followed, belonged to one and the same myotome. To this purpose 
an Acanthias or a Mustelus was cut through along the mid-sagittal 
plane and treated with a one tenth percent solution of osmie acid. 
The nerves stained black and were easy to follow with the naked 
eye or with a magnifier. 
As a first result it was found, that all nerves passed through the 
connective tissue laying between the myotomes; therefore a minute 
dissection of this tissue was necessary. 
The myotome itself is covered by a very thin layer of a fibrous 
tissue which constitutes a perimysium. This perimysium extends 
between the muscular fibres of the myotome forming an endomysium. 
It affords a continuous investment for every muscular fibre and 
forms in this way a frame for the muscular tissue. Where this mus- 
cular tissue is broken off the framework is continuous and enables 
us to recognize parts of the myotome belonging together. The 
myotomes covered by their perimysium are separated by a coarser 
and denser fibrous tissue. This intermyotomal tissue forms lamellae 
which have only a very loose connection with the perimysium, so that 
it is possible to dissect these lamellae as discrete formations. These 
intermyotomal septa pass over in the fibrous tissue of the skin and 
form a continuous formation with the latter. Where the myotome 
1) Proc. K. Akad. W. Amsterdam 28 May 1904. 
