HISTOLOGY 49 



the fiber into sarcomeres), and the delicate cell 

 membrane (sarcolemma). 



310. The connective tissue cells. Inside the fasciculus 

 they are called endomysium, around the fasciculi 

 they are known as perimysium, while outside the 

 muscle they form the epimysium. 



Drawing 27. Sketch a section of the muscle and a 

 detail of one liber. 



5. Nerve. (Cross-section of Sciatic Nerve) 

 In the sections of the nerve, observe: 



311. The individual nerve fibers. Unlike the muscle 

 fibers each is composed of more than a single cell. 

 In the individual fiber observe under high power 



312. the axis cylinder. Under the highest powers fine 

 dots, cross-sections of fibrils, appear. The fiber is 

 surrounded by a delicate exolemma. The nuclei 

 are in the spinal cord or ganglia. 



313. The medullary sheath surrounds the axis cylinder. 



314. The sheath is in turn surrounded by a delicate 

 membrane, the neurolemma. The nuclei of the 

 neurolemma are small and compact. 



315. Around the nerve is a layer of connective tissue, the 

 perineurium. 



Drawing 28. Draw a sector of the nerve under high 

 power. 



6. The Skin 



In the section of the skin, identify the following structures. 



316. The epidermis, stratified epithelium. It consists of 

 two layers, 



317. the stratum corneum, squamous epithelium, at the 

 outer surface, and 



