Dentaltown - Ben Kenobi: Did Obi-Wan Kenobi have an oral sphincter? Obi-Wan. Now there's a name I've not heard in a long, long time. A long time. Luke Skywalker: Do you know the oral sphincter? Ben Kenobi: Of course I know him...he's not a sphincter, he's the orbicularis oris muscle, a complex muscle consisting of fibers that completely encircle the mouth. Its function is apparent when pursing the lips, as occurs during whistling. Some of its fibers originate near the midline from the maxilla s
Dentaltown - Dental Anatomy and Tooth Morphology. Innervation of the teeth are branches of the trigeminal nerve (CN V). The superior alveolar nerves innervate the upper teeth and gingivae; the inferior alveolar nerves innervate the lower teeth and gingivae. The trigeminal nerve (the fifth cranial nerve, or simply CN V) is a nerve responsible for sensation in the face and motor functions such as biting and chewing; it is the largest of the cranial nerves.
Dentaltown - Dental Anatomy and Tooth Morphology. The mandible is a U-shaped bone. It is the only mobile bone of the facial skeleton, and, since it houses the lower teeth, its motion is essential for mastication. It is formed by intramembranous ossification. The mandible is composed of 2 hemimandibles joined at the midline by a vertical symphysis. The hemimandibles fuse to form a single bone by age 2 years. Each hemimandible is composed of a horizontal body with a posterior vertical extension te