(i) Schwann Cells form neurilemma outside myelin sheath of medullated nerve fibre. They help in saltatory conduction of impulses. 

(ii) Organs of corti help in hearing by transmitting the sound impulses to the brain through the auditory nerve. In brain, the sensation of hearing is felt. 

(iii) Phellogen is the cork cambium. Its cells have bipolar activity. It cuts of compactly arranged cork cells (phellem) towards outside and loose, radially arranged secondary cortex cells (phelloderm) towards inner side. Later, the cork cells become dead, lose their protoplasm. The three together are called Periderm. 

(iv) Sertoli cells are present, along the wall of seminiferous tubule and play a role in nourishing the developing sperms. , 

(v) Neutrophils are the most numerous of all leucocytes, having many lobed nucleus, fine granules and phagocytic in nature. 

(vi) Gustatory cells are the taste cells, large in number, present inside each taste bud. They contain taste hairs, sensitive to particular chemicals only when they are dissolved in solutions that enter taste pores.