Strong grip reflex

Introduction It is caused by damage to the anterior region of the movement. It is manifested by the involuntary groping of the contralateral upper limb in the air. If the object touches the palm of the patient's limb, the contact is not relaxed, and it is called strong grip radiation. When the palm is touched with a blunt object, the finger flexion and gripping action is positive, suggesting that the contralateral frontal lobe is damaged.

Cause

Strong grip reflex: When the vertebral body bundle is damaged, the brain loses its inhibitory effect on the brainstem and spinal cord, and abnormal reflex occurs. More common in frontal lobe lesions, especially in the anterior segment of the movement. The presence of one side is of great significance, suggesting contralateral frontal lobe lesions. Children under two years of age have this reflex as physiological and have no clinical significance. Tonic sputum reflexes are more common in the contralateral side of the lesion, occasionally on the same side, and this reflex is an original reflex.

an examination

Related inspection

Cerebrospinal fluid calcitonin gene-related peptide

Inspection method: When the moving object (such as the percussion hammer handle) or the finger touches the palm of the patient, the hand is continuously gripped, that is, the strong grip reflection is positive. This reflection disappeared after the age of two. Or this reflection persists and is a symptom of pyramidal damage.

The performance of the pyramidal tract is damaged, so it is called pathological reflex. Pathological reflexes must be impaired in the central nervous system. However, infants under 1 year of age are normal original protective reflexes. Later, as the nervous system matures, the pyramidal and extrapyramidal systems gradually mature. Later, as the nervous system matures, the pyramidal beam and the extrapyramid gradually mature to form the myelin sheath, so that these reflections are suppressed by the pyramidal bundle. When the pyramidal tract is damaged, the inhibition is released and pathological reflexes appear.

Differential diagnosis

(1) Frontal lobe lesions: The growth rate and direction of tumor growth are different, and the clinical symptoms appear different. Such as the bilateral side of the buckle back to the front of the invasion of mutism, autonomic disorders, one or both lower extremity spasms and left hand disuse, the use of consciousness disorder. Invasion of the premotor zone lesions showed strong positive reflexes on the opposite side. Sucking reflex positive, or Hoffmam sign and Babinski sign positive, the presence of frontal ataxia or psychiatric symptoms should be highly suspected of the possibility of frontal lesions.

(B) pseudo-ball paralysis: clinical manifestations of poor articulation, outbreak language. The lip sound and throat sound are ambiguous, the pronunciation is monotonous, low dumb, and blunt. Eating is difficult, and the food cannot be pushed to the pharynx. Soft palate and pharyngeal muscle paralysis appear ruminating. The soft palate disappears and the pharyngeal reflex exists, which is an important sign of pseudobulbar paralysis. It is more diagnostic in the early stage. Pseudobulbar paralysis is an upper motor neuron paralysis, so in addition to physiological brain stem reflexes active or hyperactive, there are some pathological reflexes, called pathological brainstem reflexes, which can have sucking reflexes, palmar reflexes, head reflexes, and mandibular reflexes. These reflections can be elicited without significant pyramidal or cerebral signs, making early diagnosis valuable.

(3) Alzheimer's disease: Any age can be affected after 30 years of age, no gender difference, insidious onset, forgetting is the earliest and most prominent symptom, and near memory loss is more prominent. Progressive mental decline, unresponsiveness, decreased judgment and understanding, repeated language and meaningless repetitive actions. Misconduct, excitement, exaggeration, euphoria, and loss of ability to work. In the later stage, there may be confusion, no expression, few blinks, and often tongues, sucking and tongue reflexes. Semi-flexed posture, slow movement, eventually severe dementia, bedridden, brain CT can be seen brain atrophy and ventricular enlargement. When the moving object (such as the percussion hammer handle) or the finger touches the palm of the patient, the hand is continuously held, that is, the strong grip reflection is positive. This reflection disappeared after the age of two. Or this reflection persists and is a symptom of pyramidal damage.

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