To further complicate card type detection, this mapping changes when card companies allocate new numbers, form partnerships with other card companies, or go out of business. When implemented correctly, automatically detecting card type improves payment form usability.
Masseter muscle. In human anatomy, the masseter is one of the muscles of mastication. In the animal kingdom, it is particularly powerful in herbivores to facilitate chewing of plant matter. The most obvious muscle of mastication is the masseter muscle, since it is the most superficial and one of the strongest. Contents.
The masseter muscle can become enlarged in patients who habitually clench or grind (with bruxism) their teeth and even in those who constantly chew gum. This masseteric hypertrophy is asymptomatic and soft; it is usually bilateral but can be unilateral.