medullary sheath การใช้

• Its fibers acquire their medullary sheaths early, but their connections have not been definitively determined.
• The neurolemma is underlain by the basal lamina ( referred to as the medullary sheath in the included illustrations ).
• As the nerve fibers pass through the lamina cribrosa sclerae they lose their medullary sheaths and are continued onward through the choroid and retina as simple axis-cylinders.
• One or more nerve fibres perforate the side of the capsule and lose their medullary sheaths; the axis-cylinders subdivide and end between the tendon fibers in irregular disks or varicosities ( see figure ).
• The nerve fibrils after losing their medullary sheaths enter the taste bud, and end in fine extremities between the gustatory cells; other nerve fibrils ramify between the supporting cells and terminate in fine extremities; these, however, are believed to be nerves of ordinary sensation and not gustatory.