Facial nerve paralysis. Facial nerve paralysis most commonly causes a unilateral, but sometimes bilateral, paralysis of the muscles responsible for facial expression. Patients often present unable to move the lip or blink and with a droopy ear and severe ptyalism.
The Fourth World is an extension of the Three-World Model, used variably to refer to. Sub-populations socially excluded from global society; Hunter-gatherer, nomadic, pastoral, and some subsistence farming peoples living beyond the modern industrial norm.
Fourth market. Refers to the practice of institutional investors trading large blocks of securities directly to avoid brokerage commissions. See: Instinet. Fourth Market. The over-the-counter market for the sale of listed securities between institutional investors. For example, if a mutual fund sells stock in Google to a hedge fund without going through an exchange, the transaction is said to occur on the fourth market.