44 



80. Sensory. Free nerve endings in 

 Demonstration. Stained by Golgi's rapid method. 



Illustrates the branching and free termination of the axis-cylin- 

 der in an epithelium. 



81. Pacinian corpuscles. Cat. From the mesentery. 

 Demonstration. Note the core (inner bulb) in which the axis-cyl- 

 inder of thenerve fiber terminates and the concentric connective 

 tissue lamellae of the capsules. 



82. Meissner's corpuscles. From the human finger. Dem- 

 onstration. There is shown a corpuscle in one of the papillae of 

 the skin. Observe the form and structural appearance. 



Examine 17 for transected corpuscles in the papillae of the skin. 

 Personal preparations showing 81 and 82 will probably be obtained 

 later. (149, 153). 



TOPICS FOR QUIZ nth Week. 



THE NERVOUS TISSUES ; THE PERIPHERAL NERVOUS SYSTEM. 



1. Distinction (a) central, (b) peripheral nervous systems. 



2. What are neurones, nerve cells, nerve fibers, neuroglia? 



3. What is the relation of nerve fiber and nerve cell ? 



4. Structure of a nerve cell considering : (a) Nucleus, (b) cell-body, (c) 

 processes, neurites and dendrites. 



5. What is the structure of the nerve cells in (a) a spinal ganglion, (b) a 

 sympathetic ganglion? 



6. Give two general types of nerve cells. 



7. Nerve fibers, varieties. 



8. Structure of a myelinic nerve fiber, axis cylinder, myelinic sheath, 

 neurilemma, nerve nuclei or corpuscles? 



9. What are nodes of Ranvier ? Internodes ? 



10. Amyelinic nerve fibers ; structure compared with myelinic nerve fibers. 



n. Where found, at least two places? 



12. How is the nerve impulse transmitted from one nerve cell to another? 



