Cervical spinal stenosis is the narrowing of the spinal canal in the neck. The spinal canal is the open area in the bones (vertebrae) that make up the spinal column.The spinal cord is a collection of nerves that runs through the spinal canal from the base of the brain to the lower back. Stiffness, pain, numbness, or weakness in the neck, shoulders, arms, hands, or legs. 2  Balance and coordination problems, such as shuffling or tripping while walking. 3  Cervical spinal stenosis can be crippling if the spinal cord is damaged.
Its singular form is called stoma, and it means 'mouth'. Stomata function is to regulate the process of photosynthesis, transpiration, respiration, etc. In this article we are going to discuss this structure and function in plants, which is an important part of plant biology. Positioning and Structure.
This is an adaptation to check excessive transpiration in these plants. Number of Stomata (Stomatal Frequency): The number of stomata in a definite area of leaf varies from plant to plant. Xerophytes possess larger number of stomata than mesophytes. Number of stomata/sq cm. is 1000 â 60,000 in different plant species. The number of stomta per unit area of leaf is called Stomatal Frequency. Stomata frequency of trees and shrubs is higher than herbs. Stomata nearly occupy one to two percent of total leaf area when fully open.