#nerve

• Diverting / Deviating — A term describing a factor, stimulus, nervous pathway, or structural element that induces a change of direction, reflection, or deviation of a physiological impulse or a biomechanical axis. In neurophysiology, it can refer to collateral neural pathways (shunts) that divert nerve impulses from their main path during central lesions, or an orthopedic device designed to correct the deviating axis of a limb affected by spasticity.
• Abducens nerve — An anatomical and clinical term used to denote the sixth cranial nerve (abducens nerve or lateral rectus nerve), which exclusively innervates the lateral rectus muscle of the eye. In neurological semiology and clinical psychiatry, paralysis or impairment of the abducens nerve causes convergent strabism and diplopia (double vision), being a crucial indicator for diagnosing intracranial hypertension, brainstem tumors, or skull base fractures, phenomena often accompanied by acute mental confusion or organic delirium.
• Acroesthesia — An abnormal and pathological increase in tactile, thermal, or painful sensitivity localized exclusively within the body's extremities, manifesting as exaggerated sensations triggered by minor stimuli.
• Acroneurosis — A general clinical term designating a group of functional neurological disorders, vasomotor and trophic in nature, localized exclusively within the extremities of the body (hands and feet). This structural neuromuscular manifestation includes syndromes such as Raynaud's disease, acrocyanosis, or erythromelalgia, characterized by crises of pallor, cyanosis, intense pain, paresthesias, and local changes in skin temperature, without an initial destructive organic lesion of the vessels.
• Acrotrophodynia — A rare pathological clinical syndrome characterized by the association of intense pain crises (odynia) with severe trophic disorders and functional vasomotor changes localized strictly within the distal extremities of the body (hands, feet, and digits). This complex neuromuscular phenomenon is caused by structural alterations of the peripheral sympathetic vegetative innervation, leading in advanced stages to painful trophic ulcers, skin thinning, and destructive nail changes.
• Acrotrophoneurosis — A complex functional and neurovegetative neurological disorder characterized by severe trophic, dystrophic, and vasomotor disturbances localized exclusively within the distal extremities of the body (hands and feet). This structural process alters normal tissue nutrition through the dysfunction of perivascular sympathetic nerve fibers, clinically manifesting as chronic edema, persistent cyanosis (acrocyanosis), skin thinning, keratinization disorders, and altered sensitivity to thermal factors.
• Afferent — Relating directly to or dependent upon something else; in administration and finance, it describes connected or resulting costs and taxes. In legal terms, it means due or returning to someone. In anatomy, it denotes vessels or nerves carrying fluids or sensory impulses from the periphery toward a central organ or the brain.
• Afferentation — A foundational physiological process consisting of the continuous transmission of nerve impulses and excitations from peripheral receptor neurons to the central nervous system neurons and cerebral cortex.
• Algoparesthesia — A complex neurological symptom characterized by the simultaneous association of a paresthesia (abnormal sensations such as numbness, tingling, or burning) with a distinct and persistent localized pain sensation. This clinical manifestation occurs due to injury, irritation, or compression of peripheral nerve fibers.
• Nociceptor — A specialized, branched free nerve ending responsible for receiving and transforming harmful stimuli (mechanical, extreme thermal, or chemical tissue damage) into painful electrical impulses transmitted to the brain; a nociceptor. These peripheral receptors are widely distributed across the skin and joints.
• Amaurotic — Pertaining to or affected with amaurosis; characterized by total or partial loss of vision without apparent external structural lesions of the eye, caused by disorders of the retina, optic nerve, or brain. Clinically, it describes symptoms or degenerative states linked to neurological blindness.
• Amaurosis — Complete loss of vision (blindness), temporary or permanent, occurring in one or both eyes, without apparent external structural lesions of the eye. Structurally, this serious clinical condition is caused by disorders affecting the retina, optic nerve, or cranial visual pathways.
• Unmyelinated — Lacking a myelin sheath; a nerve fiber or axon devoid of the protective, insulating structural lipid layer. Amielinic (unmyelinated) fibers (such as type C fibers) are characterized by a significantly slower nerve impulse conduction velocity compared to myelinated ones, playing an essential functional role in transmitting dull pain sensations, temperature, and regulating autonomic nervous system connections.
• Numbness — A transient pathological or physiological state characterized by the partial or total loss of tactile sensitivity and voluntary mobility in a specific region of the body, often associated with tingling or prickling sensations. This phenomenon shares characteristics with paresthesia and occurs due to mechanical compression of peripheral nerves, poor blood circulation, or as a symptom of neurological disorders.
• Growing numb — The act of growing numb and its result; the physiological or pathological process through which a limb or body region temporarily loses tactile sensitivity and mobility. In a neurophysiological sense, it represents the transient blockage of nerve impulse transmission, while figuratively it indicates a state of stagnation, inactivity, torpor, or a decrease in the intensity of activities or feelings.
• Numb — Having undergone the process of growing numb; a bodily limb or cutaneous tissue that has temporarily or permanently lost its tactile sensitivity and voluntary motility due to mechanical pressure, cold, or a neurological condition. Figuratively, it describes a person or a psychic faculty devoid of energy, apathetic, torpid, or inert.
• Anacusis — Total, complete, and permanent loss of hearing in one or both ears, structurally caused by profound damage to the cochlea, the auditory nerve, or the cortical nerve centers in the temporal lobe. This clinical phenomenon differs from hypoacusis by the absolute absence of any functional residual hearing, depriving the patient of sound wave perception and requiring complex neuro-sensory rehabilitation strategies or cochlear implantation.
• Anaphia — Total loss or pathological absence, either congenital or acquired, of the sense of touch (tactile sensitivity), structurally caused by damage to peripheral receptors, ascending nerve pathways, or the somatosensory cortex in the temporal/parietal lobe. This rare clinical phenomenon deprives the patient of the ability to perceive physical touch, pressure, or object textures, differing from hypoesthesia by the absolute absence of sensory response.
• Aneuria — A rare medical term used to describe a total absence, functional arrest, or severe pathological diminution of nerve impulse and conductivity within a peripheral nerve trunk. In a clinical and structural sense, this phenomenon disrupts the transmission of motor and sensory signals, often associated with severe traumatic injuries or acute degenerative processes of the nervous system.
• Antineuralgic — A property of a substance or medication to combat, alleviate, or suppress violent pain localized along the path of a nerve; in a noun sense, it represents a complex analgesic and antipyretic pharmaceutical preparation, widely used for the rapid relief of headaches, dental or intercostal neuralgias, and mild febrile states.