BPeripheral Nervous System

The peripheral nervous system consists of the cranial and spinal nerves and their branches (see figure 1-14). Twelve pairs of cranial nerves have their roots in the brain. These nerves give off branches to the structures of the head and face. Thirty-one pairs of spinal nerves have their roots in the spinal cord. They give off branches to the structures of the body from the neck down. Each nerve supplies a specific body area or structure (called innervations). Because many of the...

Exercises Lesson

INSTRUCTIONS Answer the following exercises by marking the lettered response that best answers the question, or by completing the incomplete statement, or by writing the answer in the space provided at the end of the question. After you have completed all the exercises, turn to Solutions to Exercises at the end of the lesson, and check your answers. For each exercise answered incorrectly, reread the material referenced after the answer. 1. How many teeth are present in the normal permanent...

Surfaces Of Teeth

Lingual Facial

For convenience of description and as an aid in denoting the location of areas of decay and restorations, the crown part of a tooth is divided into a number of surfaces. Some of these surfaces are characterized by certain anatomic features such as pits, grooves, and ridges. Every dental specialist should be familiar with these terms. These surfaces are named to indicate the direction each surface faces. See figure 4-5. a. Lingual. The lingual surface is that surface of the tooth that faces...

Nerve Supply Of The Jaws And Teeth

Twelve pairs of cranial nerves arise in the brain and give off branches to the structures of the head and face. These nerves leave the cranial cavity through foramina in the base of the cranium. The fifth cranial nerve the trigeminal nerve is the largest of the twelve pairs. See figure 2-13. It is of particular importance in dentistry since it provides the nerve supply to the jaws and the teeth. The fifth cranial nerve contains both motor and sensory fibers. Thus, it has a motor root supplying...