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Chapter 21
Peripheral Nervous System
| Term | Definition |
|---|---|
| Olfactory Nerves | Composed of axons of neurons whose dendrites and cell bodies lie in the nasal mucosa, high up along the septum and superior conchae (turbinates). |
| Optic Nerves | Axons from the innermost layer of sensory neurons of the retina compose the second pair of cranial nerves. |
| Abducens Nerve | A motor nerve with fibers originating from a nucleus in the pons in the floor of the fourth ventricle and extend-ing to the lateral rectus muscles of the eyes. |
| Cochlear Nerve | Consists of peripheral axon fibers starting in the organ of Corti in the cochlea of the inner ear. |
| Hypoglossal Nerve | Contains sensory fibers from proprioceptors in muscles of the tongue. |
| Reflex | The action that results from a nerve impulse passing over a reflex arc. |
| Autonomic Reflexes | Consist of contractions of smooth or cardiac muscle or secretion by glands. |
| Somatic Reflexes | Contractions of skeletal muscles. |
| Reflex Center | Synapses in anterior gray column between axons of sensory neurons and dendrites and cell bodies of LMNs. |
| Axons | In anterior roots of second, third, and fourth lumbar spinal nerves and femoral nerves; terminate in quadriceps femoris muscle. |
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