218 



STUDENTS HISTOLOGY 



EPINEURIUM. Forming the sheath of the entire nerve -trunk. 



PERINEURIUM. Surrounding the funiculi composing the nerve- 

 trunk. 



ENDONEURIUM. Surrounding and uniting the nerve-fibers of the 

 funiculi. 



NEURILEMMA. Surrounding the individual nerve -fibers of a 

 bundle. 



FIG. 138. TRANSVERSE SECTION OF THE ANTERIOR CRURAL NERVE (X 250). 



A. The epineurium. 



B. Adipose tissue in the loose areolar tissue of the sheath. 



C. Lymph-spaces of the epineurium. 



D. Large blood- vessels of epineurial sheath. 



E. Perineurium surrounding funiculi. 



F. Lymph-spaces of last. 



G. Medullated nerve-fibers in T. S. supported by connective tissue endotieurium. 



The formula E. P. E. N., composed of the initials of the nances 

 of the investments from without inward, will aid the memory. 



The epineurium serves to protect the nerve in its course, and 

 to support the nutrient blood-vessels and the channels of lym- 

 phatics. The fibers run both longitudinally and transversely. 

 The perineurium, arranged in dense bands, forms distinct sheaths 



