What is it ?
The pyramidal syndrome refers to all motor disorders caused by an attack of the pyramidal pathway. The pyramidal tract, also called pyramidal tract or cortico-spinal route is the support of the voluntary motricity: it transmits the motor control of the central nervous system from the cortex to the spinal cord. This syndrome results in a set of motor deficit that makes it difficult, if not impossible, everyday actions such as walking and clothing, as well as spasticity. Physiotherapy allows the patient to fight, to a certain extent, against the alteration of his motor skills.
Symptoms of pyramidal syndrome
The symptoms associated with a pyramidal syndrome depend on the location of the lesions of the pyramidal tract. The main function of the pyramidal pathway is to ensure motor skills through the will. Its involvement causes paralysis or paresis (partial or transient paralysis) of muscles of the body, making for example difficult walking (claudication) or impossible.
The pyramidal route also has the function of inhibiting muscle tone (muscle contraction) and reflexes (tendon). Its involvement therefore leads to an exaggeration of muscular contractions (hypertonia) and reflexes (spasticity). A person whose cortico-spinal pathway has been injured has a clonus, that is, a series of rapid and reflex muscular contractions.
The plantar skin reflex, often called the Babinski sign, is the only specific sign of pyramidal involvement. : to the stimulation of the sole of the foot, the affected person responds with an extension of the big toe in a slow and so-called “majestic” way, instead of bending the toes by reflex.
Constructive apraxia can also be associated with the pyramidal syndrome, preventing the affected person from coordinating their movements to perform complex tasks such as dressing or talking. The pyramidal syndrome also results in a loss of the ability of the individual to perform fine movements, especially with the fingers.
The origins of the disease
The pyramidal syndrome results from a localized lesion at any level of the cortico-spinal pathway: the involvement of the cerebral cortex causes contralateral partial hemiplegia; the involvement of the internal capsule causes massive hemiplegia; Brain stem involvement causes contralateral hemiplegia when the lesion is above the facial nucleus and overall hemiplegia if the lesion is located below the facial nucleus.
Risk factors for pyramidal syndrome
A stroke (stroke), cerebral hemorrhage, traumatic injury, tumors (benign or malignant), multiple sclerosis, or a generalized seizure, are all causes of damage to the road corticobasal spinal and therefore risk factors for the appearance of a pyramidal syndrome.
Prevention and treatment of pyramidal syndrome
The treatment varies according to the location of the nerve lesion and its cause. Several medications are used to treat muscle spasticity. It is also treated with intramuscular injections of botulinum toxin. This toxin produced from the bacterium Clostridium botulinum inhibits the release of the neurotransmitter acetylcholine and causes relaxation of the muscle fibers. Physiotherapy (or physiotherapy) rehabilitation of muscles with paresis is at the heart of treatment.