Decerebrate Rigidity

decerebrate rigidity

[dē′ser·ə‚brət ri′jid·əd·ē] (medicine) Exaggerated postural tone in the antigravity muscles due to release of vestibular nuclei from cerebral control.

Decerebrate Rigidity

a sharp increase in the tonus of extensor muscles and a relative relaxation of the flexor muscles, arising as a result of severing the brain stem—that is, decerebration. In decerebrate rigidity the reflexes that maintain body balance and the ability to move are lost; the trunk and all the animal’s extremities are extended and stretch spasmodically and the head is thrown back (so-called opisthotonos). The cause of decerebrate rigidity is the freeing of the tonic centers of the medulla oblongata and the spinal cord from the inhibitory control of the reticular formation of the medulla oblongata and the midbrain.

decerebrate rigidity

decerebrate

[de-ser´ĕ-brāt] 1. to eliminate cerebral function by transection of the brainstem or ligation of the common carotid arteries and basilar artery at the center of the pons.2. a laboratory animal so prepared.decerebrate rigidity a posture found in those with lesions of the upper part of the brainstem or severe bilateral lesions of the cerebrum; the patient lies in rigid extension with the arms internally rotated at the shoulders, elbows, knees, and hips extended, and fingers, ankles, and toes flexed. The jaw may be clenched with the neck hyperextended. Called also decerebrate posturing.

Decerebrate rigidity (or posturing).

rigidity

[rĭ-jid´ĭ-te] inflexibility or stiffness.clasp-knife rigidity increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease. Called also clasp-knife reflex.cogwheel rigidity tension in a muscle that gives way in little jerks when the muscle is passively stretched; seen in parkinson's disease.decerebrate rigidity see decerebrate rigidity.decorticate rigidity see decorticate rigidity.paratonic rigidity an intermittent abnormal increase in resistance to passive movement in a comatose patient.

de·cer·e·brate ri·gid·i·ty

a postural change that occurs in some comatose patients, consisting of episodes of opisthotonos, rigid extension of the limbs, internal rotation of the upper extremities, and marked plantar flexion of the feet; produced by a variety of metabolic and structural brain disorders. Synonym(s): decerebrate state

de·cer·e·brate ri·gi·di·ty

(dē-ser'ĕ-brăt ri-jid'i-tē) A postural change that occurs in some comatose patients, consisting of episodes of opisthotonos, rigid extension of the limbs, internal rotation of the upper extremities, and marked plantar flexion of the feet; produced by a variety of metabolic and structural brain disorders.
See also: decorticate rigidity

decerebrate rigidity

The marked increase in tension (tone) that occurs in the antigravity muscles when the brain is no longer exercising control.

decerebrate rigidity

a state in which the limb extensor muscles go into tonic contraction and the limbs are held rigidly out from the body. This occurs if the brain is transected immediately behind the ganglionic centre (red nucleus) of the midbrain.

单词	decerebrate rigidity
释义	DictionarySeedecerebrate Decerebrate Rigidity decerebrate rigidity [dē′ser·ə‚brət ri′jid·əd·ē] (medicine) Exaggerated postural tone in the antigravity muscles due to release of vestibular nuclei from cerebral control. Decerebrate Rigidity a sharp increase in the tonus of extensor muscles and a relative relaxation of the flexor muscles, arising as a result of severing the brain stem—that is, decerebration. In decerebrate rigidity the reflexes that maintain body balance and the ability to move are lost; the trunk and all the animal’s extremities are extended and stretch spasmodically and the head is thrown back (so-called opisthotonos). The cause of decerebrate rigidity is the freeing of the tonic centers of the medulla oblongata and the spinal cord from the inhibitory control of the reticular formation of the medulla oblongata and the midbrain. decerebrate rigidity decerebrate [de-ser´ĕ-brāt] 1. to eliminate cerebral function by transection of the brainstem or ligation of the common carotid arteries and basilar artery at the center of the pons.2. a laboratory animal so prepared.decerebrate rigidity a posture found in those with lesions of the upper part of the brainstem or severe bilateral lesions of the cerebrum; the patient lies in rigid extension with the arms internally rotated at the shoulders, elbows, knees, and hips extended, and fingers, ankles, and toes flexed. The jaw may be clenched with the neck hyperextended. Called also decerebrate posturing. Decerebrate rigidity (or posturing). rigidity [rĭ-jid´ĭ-te] inflexibility or stiffness.clasp-knife rigidity increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease. Called also clasp-knife reflex.cogwheel rigidity tension in a muscle that gives way in little jerks when the muscle is passively stretched; seen in parkinson's disease.decerebrate rigidity see decerebrate rigidity.decorticate rigidity see decorticate rigidity.paratonic rigidity an intermittent abnormal increase in resistance to passive movement in a comatose patient. de·cer·e·brate ri·gid·i·ty a postural change that occurs in some comatose patients, consisting of episodes of opisthotonos, rigid extension of the limbs, internal rotation of the upper extremities, and marked plantar flexion of the feet; produced by a variety of metabolic and structural brain disorders. Synonym(s): decerebrate state de·cer·e·brate ri·gi·di·ty (dē-ser'ĕ-brăt ri-jid'i-tē) A postural change that occurs in some comatose patients, consisting of episodes of opisthotonos, rigid extension of the limbs, internal rotation of the upper extremities, and marked plantar flexion of the feet; produced by a variety of metabolic and structural brain disorders. See also: decorticate rigidity decerebrate rigidity The marked increase in tension (tone) that occurs in the antigravity muscles when the brain is no longer exercising control. decerebrate rigidity a state in which the limb extensor muscles go into tonic contraction and the limbs are held rigidly out from the body. This occurs if the brain is transected immediately behind the ganglionic centre (red nucleus) of the midbrain.
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