#brainstem

• abducens — 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.
• abducție — The movement by which a limb, a limb segment, or the eyeball is moved away from the median axis of the body or a reference line. In neurological semiology, testing abduction (such as ocular abduction, performed by cranial nerve VI) is essential for locating brainstem lesions. In clinical psychiatry, resistance to passive abduction of the limbs is analyzed as a marker for waxy flexibility or catalepsy in catatonic syndromes.