the rounded portion of the brain, directly behind the cerebrum in birds and mammals, that serves mainly to coordinate movement, posture, and balance. [1555â65; < Latin: brain, diminutive of cerebrum (for formation see castle)] cer`eâ¢belâ²lar, adj.
A pulled muscle is a painful injury that is caused when muscle fibers become torn. These injuries are usually caused by engaging in physical activity without properly warming up first. They can also occur when a person who is not in shape does something that is strenuous to the muscles.
Muscle strains, also called pulls, occur when the small fibers within a muscle are stretched beyond their limits, which results in a partial or complete tear (rupture). All muscle pulls are categorized as either Grade I (tearing of a few fibers), Grade II (more extensive fiber damage) or Grade III (complete rupture).