Nerve, third cranial
The third cranial nerve is the oculomotor nerve. The cranial nerves emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column. There are twelve cranial nerves. The oculomotor nerve is responsible for the nerve supply to muscles about the eye: {{}}The upper eyelid muscle which raises the eyelid; The extraocular muscle which moves the eye inward; and The pupillary muscle which constricts the pupil. Paralysis of the oculomotor nerve results in drooping eyelid (ptosis), deviation of the eyeball outward (and therefore double vision) and a dilated (wide-open) pupil.

Medical dictionary. 2011.

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  • Third cranial nerve — Nerve, third cranial: The third cranial nerve is the oculomotor nerve. The cranial nerves emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column. There are twelve cranial nerves. The… …   Medical dictionary

  • Cranial nerve, third — The third cranial nerve is the oculomotor nerve. The cranial nerves emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column. There are twelve cranial nerves. The oculomotor nerve is… …   Medical dictionary

  • third cranial nerve — noun supplies extrinsic muscles of the eye • Syn: ↑oculomotor, ↑oculomotor nerve, ↑nervus oculomotorius • Hypernyms: ↑cranial nerve * * * noun or third nerve …   Useful english dictionary

  • cranial nerve third — nervus oculomotorius …   Medical dictionary

  • Nerve — A bundle of fibers that uses electrical and chemical signals to transmit sensory and motor information from one body part to another. See nervous system. * * * A whitish cordlike structure composed of one or more bundles (fascicles) of myelinated …   Medical dictionary

  • cranial nerve — noun any of the 12 paired nerves that originate in the brain stem • Hypernyms: ↑nerve, ↑nervus • Hyponyms: ↑olfactory nerve, ↑nervii olfactorii, ↑first cranial nerve, ↑optic nerve, ↑ …   Useful english dictionary

  • Cranial nerve III — The third cranial nerve is the oculomotor nerve. The cranial nerves emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column. There are twelve cranial nerves. The oculomotor nerve is… …   Medical dictionary

  • Nerve, oculomotor — The oculomotor nerve is the third cranial nerve. (The cranial nerves emerge from or enter the cranium, the skull, as opposed to the spinal nerves which emerge from the vertebral column). The oculomotor nerve is responsible for the nerve supply to …   Medical dictionary

  • third nerve — noun see third cranial nerve …   Useful english dictionary

  • Cranial nerves — are nerves that emerge directly from the brain stem in contrast to spinal nerves which emerge from segments of the spinal cord. Although thirteen cranial nerves in humans fit this description, twelve are conventionally recognized. The nerves from …   Wikipedia

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