tonic labyrinthine reflexes

tonic labyrinthine reflexes

[′tän·ik ‚lab·ə′rin‚thēn ′rē‚flek·səz]
(physiology)
Rotation or deviation of the head causes extension of the limbs on the same side as the chin, and flexion of the opposite extremities: dorsiflexion of the head produces increased extensor tonus of the upper extremities and relaxation of the lower limbs, while ventroflexion of the head produces the reverse; seen in the young infant and patients with a lesion at the midbrain level or above.
References in periodicals archive ?
Cerebral palsy(CP) is an irreversible maldevelopment of brain in prenatal, perinatal or postnatal stage, which is demonstrated by prolonged retention of reflexes and abnormal muscular tone.1 Most of the time this motor disability disorder leads to insufficient development of postural reflex mechanism.2 The primitive and retained reflexes cause the abnormal movements, defective visual abilities, learning difficulties and emotional disturbances.3 Brainstem reflexes comprise tonic labyrinthine reflexes (TLRs), asymmetric and symmetric tonic reflexes, and these usually appear throughout the first four months of a child's life.4 These primitive reflexes are modified afterwards in righting reactions of neck and body that contribute toward the skeletal stabilisation.