Central facial palsy tongue bias to the unaffected side

Which side of the mental and tongue muscles are paralyzed and the tongue protrudes to which side, and there is no such thing as biasing towards the unaffected side.

Correct answer: e

Analysis: The internal capsule lesion leads to paralysis and hemiplegia of the facial muscles, tongue muscles and limbs of the contralateral lower side, which is the "three deviations" of movement

Brainstem lesions lead to cross-paralysis, in which the level of injury: peripheral paralysis; Below the level of injury: central paralysis.

The thalamus is generally associated with sensory impairment, and cerebellar and spinal cord lesions do not cause facial tongue palsy.

This question examines the localization and diagnosis of the motor system, and learning anatomy well is the key to understanding this part of the content.

In central facial paralysis, the tongue is often deviated to the affected side (facial paralysis side), because the cortical nucleus bundle formed by the axons of pyramidal cells in the lower part of the anterior gyrus descends through the knee of the inner capsule to the medial part of the cerebral foot 3 5, from which downward, the fibers are successively divided, most of which terminate in the motor nuclei of bilateral cranial nerves (oculomotor nucleus, trochlear nucleus, abducens nucleus, trigeminal nerve motor nucleus, facial nerve motor nucleus innervating the cell population of the upper facial muscle, suspicious nucleus and accessory nerve spinal nucleus), innervating extraocular muscles, masticatory muscles, Facial facial expression muscles, sternocleidomastoid muscles, trapezius muscles, and throat muscles. A small portion of the fibers completely crosses to the contralateral side and terminates at the motor nucleus of the facial nerve innervating the cell population of the lower facial muscles and the hypoglossal nerve nucleus, innervating the lower facial expression and tongue muscles.

Thus, with the exception of the facial nerve nucleus and the hypoglossal nerve nucleus, which innervate the inferior facial muscles, which are unilateral (contralateral), the motor nuclei of the other cranial nerves receive fibers from bilateral cortical nucleus tracts. Damage to one upper motor neuron can produce paralysis of the facial muscles below the contralateral eye cleft and the contralateral tongue muscle, which is manifested as the disappearance of the nasolabial fold on the opposite side of the lesion, the lower hanging of the corners of the mouth and the deviation of the lesion side, salivation, inability to do cheek bulging, tooth baring and other movements, and the tip of the tongue is biased to the opposite side of the lesion when the tongue is protruded.

In the case of peripheral facial nerve palsy on one side, all facial muscles on the lesion side can be paralyzed, which is manifested as the disappearance of frontal striae, the inability to close the eyes, the drooping corners of the mouth, and the disappearance of nasolabial folds. Damage to the motor neuron under the hypoglossal nerve on one side can cause paralysis of all tongue muscles on the lesion side, which is manifested by the deviation of the tip of the tongue to the lesion side when the tongue is protruded. In isolated cases of peripheral facial nerve palsy, a deviation of the tongue may be seen, in which case the tongue is always deviated toward the unaffected side.

This is due to paralysis of the styloid and palatohylossal muscles, which are innervated by the facial nerve.

Hello SPAN, central facial paralysis refers to facial paralysis caused by lesions located between the facial nerve nucleus and the center of the cerebral cortex, that is, when one cortical brainstem tract is damaged. In general, the facial expression muscles above the eyelids are not paralyzed, so the patient's eye closure, frowning, and eyebrow raising movements are normal, and the depth of the frontal muscles, eyebrow height, and palpebral fissure size on both sides are not abnormal. /span

SPAN recommends that you should go to a regular facial nerve hospital for treatment in time, on the one hand, it will alleviate the condition, on the other hand, early detection and early **, save medical costs, and do not blindly use drugs by yourself, so as not to interfere with the diagnosis and affect the efficacy, and the gains outweigh the losses. In addition, combined with diet, exercise, etc., I believe that your illness will be cured soon. Good luck with a speedy **.

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How is facial paralysis diagnosed? Central facial palsy is serious and teaches you how to recognize it quickly.