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Hypotonia is a state of low muscle tone [1] (the amount of tension or resistance to stretch in a muscle), often involving reduced muscle strength. Hypotonia is not a specific medical disorder, but a potential manifestation of many different diseases and disorders that affect motor nerve control by the brain or muscle strength.
altered muscle tone (hypotonia or hypertonia) – a decrease or increase in the baseline level of muscle activity; decreased endurance; exaggerated deep tendon reflexes including spasticity, and clonus (a series of involuntary rapid muscle contractions) Such signs are collectively termed the "upper motor neuron syndrome".
Hypertonia is a term sometimes used synonymously with spasticity and rigidity in the literature surrounding damage to the central nervous system, namely upper motor neuron lesions. [1] Impaired ability of damaged motor neurons to regulate descending pathways gives rise to disordered spinal reflexes , increased excitability of muscle spindles ...
Another form of hypertonia is paratonia, which is associated with dementia. [5] Hypotonia is seen in lower motor neuron disease like poliomyelitis. Hypotonia can present clinically as muscle flaccidity, where the limbs appear floppy, stretch reflex responses are decreased, and the limb's resistance to passive movement is also decreased. [1]
Hypotonia or atonia – Tone is not velocity dependent. Hyporeflexia - Along with deep reflexes even cutaneous reflexes are also decreased or absent. Strength – weakness is limited to segmental or focal pattern, Root innervated pattern [clarification needed] The extensor plantar reflex (Babinski sign) is usually absent. Muscle paresis ...
The weakness is indicated as hypotonia, or lack of muscle tone, which can make an infant seem unstable. [1] [5] Eventually, most patients develop joint contractures or fixed joint deformities. [6] Children may be slow with their motor skills; such as rolling over, sitting up or walking, or may not even reach these milestones of life. Some of ...
1p36 deletion syndrome is a congenital genetic disorder characterized by moderate to severe intellectual disability, delayed growth, hypotonia, seizures, limited speech ability, malformations, hearing and vision impairment, and distinct facial features. The symptoms may vary, depending on the exact location of the chromosomal deletion.
Landau reflex or Landau reaction refers to a reflex seen in infants when held horizontally in the air in the prone position. [1] It emerges 3 months after birth and lasts until up to 12 months to 24 months of age. [2]