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spinal nerves

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biceps jerk

Overview page. Subjects: Medicine and Health.

A deep tendon reflex mediated by the fifth cervical spinal nerve (C5). The examiner’s thumb or index finger is placed over the patient’s biceps tendon in the elbow crease and struck sharply...

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coccygeal nerve

Overview page. Subjects: Psychology.

Either of a pair of spinal nerves attached to the bottom of the spinal cord, serving the striped muscles, the skin, and the autonomic nervous system. [From Greek kokkyx the cuckoo, from the...

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cranial nerves

Overview page. Subjects: Medicine and Health — Science and Mathematics.

(kray-niăl)

the 12 pairs of nerves that arise directly from the brain and leave the skull through separate apertures. Compare spinal nerves.

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nerve

Overview page. Subjects: Dentistry.

A cordlike structure that transmits impulses either from the brain or spinal cord to muscles and glands (motor nerves), or in the opposite direction from the sense organs to the brain and...

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patellar reflex

Overview page. Subjects: Medicine and Health.

(knee jerk) reflex contraction of the quadriceps (thigh) muscle so that the leg kicks, elicited in a patient sitting with one knee crossed over the other by sharply tapping the tendon of...

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peripheral nervous system

Overview page. Subjects: Science and Mathematics.

All parts of the nervous system excluding the central nervous system. It consists of all the cranial and spinal nerves and their branches, which link the receptors and effectors with the...

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root

Overview page. Subjects: Biological Sciences.

The lower part of a plant, usually underground, by which the plant is anchored and through which water and mineral nutrients enter the plant.

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root

Overview page. Subjects: Medicine and Health.

n. 1. (in neurology) a bundle of nerve fibres at its emergence from the spinal cord. The 31 pairs of spinal nerves have two roots on each side, an anterior root...

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sacral nerves

Overview page. Subjects: Medicine and Health.

The five pairs of spinal nerves that emerge from the spinal column in the sacrum. The nerves carry sensory and motor fibres from the upper and lower leg and from the anal and genital...

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spinal cord

Overview page. Subjects: Medicine and Health — Science and Mathematics.

The portion of the central nervous system that lies in the vertebral canal, and from which spinal nerves emerge.

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