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Example research essay topic: Cerebral Cortex Muscle Tone - 548 words

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Regardless of the etiologic factor or type of seizure, the basic mechanism is the same. The electric discharges (1) may arise form central areas in the brain that affect consciousness immediately; (2) may be restricted to one area of the cerebral cortex, producing manifestations characteristic of that particular anatomic focus; or (3) may begin in a localized area of the cortex and spread to other portions of the brain, which if sufficiently extensive, produce generalized neurologic manifestations. Seizure activity is believed to be caused by a spontaneous electric discharge initiated by a group of hyper excitable celled referred to as epileptogenic focus. Normally these discharges are restrained from spreading beyond the focal area by normal inhibitory mechanisms. In response to any of a variety of stimuli, such as cellular dehydration, abnormal blood sugar levels, electrolyte imbalance, fatigue, emotional stress, temperature elevation, and endocrine changes, these hyper excitable cells activate normal cells in surrounding areas and in distant, synaptic ally related cells.

A seizure develops when the neuronal excitation from the epileptogenic focus spreads to the brainstem (particularly the midbrain and reticular formation) or to other portions of the brain. These centers within the brainstem, known as the centro cephalic system, are responsible for the spread of the epileptic potentials. The discharges originate spontaneously in the centr encephalic system or be triggered by a focal area in the cortex. Manifestations depend on the type of seizure, which may be classified as partial or generalized. In partial seizures, the excess neuronal discharge is contained within one region of the cerebral cortex. In generalized seizures, the discharge bilaterally and diffusely involves the entire cortex.

Sometimes a focal lesion of one part of the hemisphere activates the entire cerebrum bilaterally so rapidly that it produces a generalized tonic-clonic seizure before a focal sign appears. n Consists of motor, sensory, or psychomotor phenomena without loss of consciousness. Patient may have chewing movements, smacking lips, localized numbness or tingling, localized twitching of muscles, olfactory hallucinations, visual hallucinations (flashes of light or formed images). n Consists of the patient losing contact with surroundings for 1 to 2 minutes.

Patient may stare, perform automatic purposeless movements, utter unintelligible sounds without understanding what is said, resist n Consists of loss of consciousness and motor function from the onset. Characterized by sudden flexion of the arms, forward flexion of the trunk, and extension of the legs. Last a few seconds. Poor Characterized by brief, primarily generalized attacks manifested by a 10 to 30 sec lapse of consciousness and eyelid flutterings at a rate of 3 /sec, with or without loss of axial muscle tone.

Abruptly stop activity and pick it back up as if nothing C) Generalized Tonic-Clonic Seizures Typically begin with an outcry; they continue with loss of consciousness and falling, followed by tonic, then clonic contractions of the muscles of the extremities, trunk, and head. Urinary and fecal incontinence may occur. Seizures last 1 to 2 minutes. May be aura. (Postictal = drowsy, sleepy) Primarily generalized seizures. They are characteristic of loss of muscle tone and consciousness. The child falls or pitches to the Brief, lightning jerks of a limb, several limbs, or the trunk.

Associated with fever (temperature increases rapidly without evidence of intracranial infection. They are brief, solitary, and generalized tonic-clonic in form. Bibliography:


Free research essays on topics related to: consciousness, cortex, cerebral cortex, generalized, muscle tone

Research essay sample on Cerebral Cortex Muscle Tone

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