27. Nervous system 2

The nervoussystem 2

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Sensation

Sight

Hearing

Numbness

Blindness

Deafness

Diplopia Double vision, also called diplopia, causes a person to see two images of a single object. There are two types of double vision: monocular and binocular.

Paraesthesiae A spontaneous abnormal usually nonpainful sensation (for example, burning, pricking); may be due to lesions of both the central and peripheral nervous systems.

Tinnitus Ringing in the ears, is the sensation of hearing ringing, buzzing, hissing, chirping, whistling, or other sounds. The noise can be intermittent or continuous, and can vary in loudness.

Sensory loss

Motor System

The motor system is the set of central and peripheral structures in the nervous system that support motor functions, i.e. movement. Peripheral structures may include skeletal muscles and neural connections with muscle tissues. Central structures include cerebral cortex, brainstem, spinal cord, pyramidal system including the upper motor neurons, extrapyramidal system, cerebellum, and the lower motor neurons in the brainstem and the spinal cord.

Motor Impairment

Motor impairment is the partial or total loss of function of a body part, usually a limb or limbs. This may result in muscle weakness, poor stamina, lack of muscle control, or total paralysis. Motor impairment is often evident in neurological conditions such a cerebral palsy, Parkinson’s disease, stroke and multiple sclerosis.

COMA

A coma is a deep state of prolonged unconsciousness in which a person cannot be awakened, fails to respond normally to painful stimuli, light, or sound, lacks a normal wake-sleep cycle and does not initiate voluntary actions. Coma patients exhibit a complete absence of wakefulness and are unable to consciously feel, speak or move. Comas can be derived by natural causes, or can be medically induced.