Bell-Magendie Law

in anatomy and physiology, a fundamental principle of the distribution of motor and sensory fibers in the nerve roots of the spinal cord. The Bell-Magendie law was established in 1822 by the French physiologist F. Magendie. At its base lay, in part, the observations of the English anatomist and physiologist C. Bell, published in 1811. According to the Bell-Magendie law, efferent (motor) nerve fibers emerge from the spinal cord as part of the anterior roots, and the afferent (sensory) fibers enter the spinal cord as part of the posterior roots. The efferent nerve fibers that innervate the smooth muscles, blood vessels, and glands also emerge from the anterior roots.

Bell-Magendie law

Bell law

(bel), the ventral spinal roots are motor, the dorsal are sensory. Synonym(s): Bell-Magendie law, Magendie law

Bell, Sir Charles

(bel) Scottish physiologist and surgeon, 1774–1842.

Bell law

, Bell-Magendie lawThe fact that anterior spinal nerve roots contain only motor fibers and posterior roots only sensory fibers. Synonym: law of Magendie

Bell nerve

Long thoracic nerve; nervus thoracicus longus.

BELL PALSY: Asymmetrical smile in patient with Bell Palsy

Bell palsy

Paralysis of the facial nerve. Bell palsy is usually caused by a reactivation of herpes simplex virus although other infections (such as syphilis or Lyme disease) are sometimes implicated. Complications may include corneal drying and ulceration and mild dysarthria. Either side of the face may be affected. Attacks recur in about 10% of cases. Synonym: Bell paralysisfacial palsy; facial nerve palsy; facial nerve paralysis; facial paralysis

Symptoms

Paralysis of the facial nerve typically results in an asymmetrical facial appearance. The affected patient is unable to raise one side of the mouth to smile or to wrinkle or raise the eyebrow on the same side. This peripheral nerve dysfunction is distinguished from strokes that alter facial movement by the involvement of both the forehead and the mouth. Paralysis of the face caused by strokes usually only limits movement of the oral muscles. See: illustration

Treatment

Tapering doses of prednisone without antiviral drugs provide the most effective results. In addition, the affected eye should be protected from drying with artificial tears or unmedicated ointments. Some practitioners advise wearing sunglasses during the palsy or patching the eye to protect it from foreign bodies or drying.

Prognosis

Partial facial paralysis is usually resolved within several months. The likelihood of complete recovery after total paralysis varies from 20% to 90%.

Bell paralysis

Bell palsy.

Bell phenomenon

Rolling of the eyeball upward and outward when an attempt is made to close the eye on the side of the face affected in peripheral facial paralysis.

Bell law

, Bell-Magendie lawThe fact that anterior spinal nerve roots contain only motor fibers and posterior roots only sensory fibers. Synonym: law of MagendieSee also: Bell, Sir Charles

Bell,

Sir Charles, Scottish surgeon, anatomist, and physiologist, 1774-1842. Bell law - the ventral spinal roots are motor, the dorsal are sensory. Synonym(s): Bell-Magendie law; Magendie lawBell-Magendie law - Synonym(s): Bell lawBell palsy - paresis or paralysis, usually unilateral, of the facial muscles, caused by dysfunction of the 7th cranial nerve. Synonym(s): peripheral facial paralysisBell phenomenon - upward movement of the eye on attempted eyelid closure in a patient with peripheral facial paralysis.Bell respiratory nerve - Synonym(s): long thoracic nerveBell spasm - involuntary twitching of the facial muscles. Synonym(s): facial ticexternal respiratory nerve of Bell - Synonym(s): long thoracic nerve

Magendie,

François, French physiologist, 1783-1855. Bell-Magendie law - Synonym(s): Bell lawMagendie foramen - Synonym(s): medial aperture of the fourth ventricleMagendie law - Synonym(s): Bell lawMagendie spaces - space between the pia and arachnoid at the level of the fissures of the brain.Magendie-Hertwig sign - skew deviation of the eyes in acute cerebellar lesions. Synonym(s): Magendie-Hertwig syndromeMagendie-Hertwig syndrome - Synonym(s): Magendie-Hertwig sign

单词	bell-magendie law
释义	Bell-Magendie Law Bell-Magendie Law in anatomy and physiology, a fundamental principle of the distribution of motor and sensory fibers in the nerve roots of the spinal cord. The Bell-Magendie law was established in 1822 by the French physiologist F. Magendie. At its base lay, in part, the observations of the English anatomist and physiologist C. Bell, published in 1811. According to the Bell-Magendie law, efferent (motor) nerve fibers emerge from the spinal cord as part of the anterior roots, and the afferent (sensory) fibers enter the spinal cord as part of the posterior roots. The efferent nerve fibers that innervate the smooth muscles, blood vessels, and glands also emerge from the anterior roots. Bell-Magendie law Bell law (bel), the ventral spinal roots are motor, the dorsal are sensory. Synonym(s): Bell-Magendie law, Magendie law Bell, Sir Charles (bel) Scottish physiologist and surgeon, 1774–1842. Bell law , Bell-Magendie lawThe fact that anterior spinal nerve roots contain only motor fibers and posterior roots only sensory fibers. Synonym: law of Magendie Bell nerve Long thoracic nerve; nervus thoracicus longus. BELL PALSY: Asymmetrical smile in patient with Bell Palsy Bell palsy Paralysis of the facial nerve. Bell palsy is usually caused by a reactivation of herpes simplex virus although other infections (such as syphilis or Lyme disease) are sometimes implicated. Complications may include corneal drying and ulceration and mild dysarthria. Either side of the face may be affected. Attacks recur in about 10% of cases. Synonym: Bell paralysisfacial palsy; facial nerve palsy; facial nerve paralysis; facial paralysis Symptoms Paralysis of the facial nerve typically results in an asymmetrical facial appearance. The affected patient is unable to raise one side of the mouth to smile or to wrinkle or raise the eyebrow on the same side. This peripheral nerve dysfunction is distinguished from strokes that alter facial movement by the involvement of both the forehead and the mouth. Paralysis of the face caused by strokes usually only limits movement of the oral muscles. See: illustration Treatment Tapering doses of prednisone without antiviral drugs provide the most effective results. In addition, the affected eye should be protected from drying with artificial tears or unmedicated ointments. Some practitioners advise wearing sunglasses during the palsy or patching the eye to protect it from foreign bodies or drying. Prognosis Partial facial paralysis is usually resolved within several months. The likelihood of complete recovery after total paralysis varies from 20% to 90%. Bell paralysis Bell palsy. Bell phenomenon Rolling of the eyeball upward and outward when an attempt is made to close the eye on the side of the face affected in peripheral facial paralysis. Bell law , Bell-Magendie lawThe fact that anterior spinal nerve roots contain only motor fibers and posterior roots only sensory fibers. Synonym: law of MagendieSee also: Bell, Sir Charles Bell, Sir Charles, Scottish surgeon, anatomist, and physiologist, 1774-1842. Bell law - the ventral spinal roots are motor, the dorsal are sensory. Synonym(s): Bell-Magendie law; Magendie lawBell-Magendie law - Synonym(s): Bell lawBell palsy - paresis or paralysis, usually unilateral, of the facial muscles, caused by dysfunction of the 7th cranial nerve. Synonym(s): peripheral facial paralysisBell phenomenon - upward movement of the eye on attempted eyelid closure in a patient with peripheral facial paralysis.Bell respiratory nerve - Synonym(s): long thoracic nerveBell spasm - involuntary twitching of the facial muscles. Synonym(s): facial ticexternal respiratory nerve of Bell - Synonym(s): long thoracic nerve Magendie, François, French physiologist, 1783-1855. Bell-Magendie law - Synonym(s): Bell lawMagendie foramen - Synonym(s): medial aperture of the fourth ventricleMagendie law - Synonym(s): Bell lawMagendie spaces - space between the pia and arachnoid at the level of the fissures of the brain.Magendie-Hertwig sign - skew deviation of the eyes in acute cerebellar lesions. Synonym(s): Magendie-Hertwig syndromeMagendie-Hertwig syndrome - Synonym(s): Magendie-Hertwig sign
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