Positive sucking reflex

Introduction Infants have a sucking reflex for 0 to 3 months, and putting something into the baby's mouth will suck. After 6 weeks, the breathing, sucking and swallowing reflexes are coordinated, and feeding will become more efficient. The chewing function of newborn babies is not yet complete, and the breast milk or formula can only be taken by sucking action, so when an object such as a cotton swab or a finger is put into the baby's mouth, the baby will naturally have a sucking action. It will slowly disappear after 3 months. Sucking reflexes in non-childhood are more common in frontal lobe lesions and pseudobulbar paralysis.

Cause

The sucking reflex afferent nerve is the first branch of the trigeminal nerve, and the central nucleus in the anterior bridge trigeminal nerve senses the main nucleus - the reticular structure - the facial nucleus, and the facial nerve nucleus. This reflex is more common in frontal lobe lesions and pseudobulbar paralysis.

When the newborn's lips touch the nipple, the mouth is opened and the sucking action of the lips and tongue appears as sucking reflex. The reflection disappeared after 1 year of age. If the neonatal sucking reflex disappears or is significantly weakened, it indicates brain lesions; if hyperthyroidism is hunger performance. There is still a suggestion of cerebral cortical dysfunction after 1 year of age.

an examination

Related inspection

Brain CT examination

Clinical examination symptoms:

When you gently stroke or lick your lips, the orbicularis muscle contraction immediately occurs, and the upper and lower lips rise, causing a "sucking" movement. Normal people do not have this reflection.

1, appearance time: 0-3 months

2, characteristics: put things into the baby's mouth will suck. After 6 weeks, the breathing, sucking and swallowing reflexes are coordinated, and feeding will become more efficient.

3, clinical manifestations: light stroke or licking the lips, immediately the contraction of the orbicularis muscle, the upper and lower lips picked up, causing "sucking" action. Normal people do not have this reflection.

4, disappearing time: 3 months later will begin to slowly disappear. Nowadays, medicine borrows the sucking reflex of the comatose patient and turns "waste" into "treasure", and successfully puts the stomach tube.

Differential diagnosis

Differential diagnosis:

(1) Frontal lobe lesion The growth rate and direction of the tumor 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) pseudobulb palsy (pseudobul baupalsy) clinical manifestations of poor articulation, fulminant 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 (alzheimer's disease) can occur at any age after 30 years of age, no gender difference, insidious onset, forgetting for the earliest and most prominent symptoms, 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.

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