Orbicularis Oris

This muscle is innervated by the bucal branch of the facial nerve. 

As a sphincter muscle around the mouth, this muscle is anchored to the nasal septum and the maxilla above and the mandible below. There is no clear point of origin or insertion. This muscle is in close connection with several small muscles, which give an infinite variety of expressions to the facial activity. 

Patient is supine with head in neutral position. 

One-finger s breadth lateral to the angle of the mouth the electrode is inserted through the skin at a 20 angle and is advanced toward either the upper or the lower lip. The tip of the electrode should not be closer than 2cm from the midline. 

One of the important functions of this muscle is to open and close the mouth voluntarily for a variety of reasons. Furthermore, in conjunction with all of the small muscles it is attached to, it becomes an important muscle that conveys a large number of different emotional states associated with mirth or grief delight or sadness fear or despair. The paralysis of part of this sphincter produces a marked impact on the ability to express all of these emotional states. This muscle also plays an important role in the proper pronunciation of words and in eating food (chewing). Whisfiing becomes very difficult and the individual may drool from the comer of his mouth on the affected side. 

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What were the ancient Romans talking about when they described orbicularis oris activity as osculum, basium, or saviolunii... 

Figure 9.12 Mold for cleft lip model and orbicularis oris muscle.

Two types of equation are needed to compute the network myoelastic eqmtions that describe the physical behaviour of the walls of the pipes and aerodynamic eqmtions that describe the evolution of the movements and pressures of the air in the network. The variables for these equations are specified by means of 29 parameters that metaphorically describe the actions of the vocal tract muscles and organs, such as cricothyroid, styloglossus, orbicularis oris and masseter, to cite but four. This s)mthesiser is capable of producing utterances with an... 

Retroauricular Frontalis Orbicularis oculi Elevator nostril Orbicularis oris... 

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