Transverse process: The wing of bone on either side of each vertebral arch where the pedicle meets the lamina.
Tremor: A neurologic movement disorder characterized by involuntary fine rhythmic tremor of a body part or parts, primarily the hands and arms (upper limbs). In many affected individuals, upper limb tremor may occur as an isolated finding. However, in others, tremor may gradually involve other anatomic regions, such as the head, voice, tongue, or roof of the mouth (palate), leading to difficulties articulating speech (dysarthria). Less commonly, tremor may affect muscles of the trunk or legs. More about essential tremor.
Trigeminal nerve: The fifth cranial nerve and the largest, it is primarily sensory except for a small motor branch that supplies the muscles for chewing. The branches of the trigeminal nerve provide sensation to the eye and forehead, midface, and upper and lower jaw.
Trigeminal neuralgia: Paroxysmal pain in the face. Pain may be so severe that it causes an involuntary grimace or "tic" (tic douloureux). More about trigeminal neuralgia.
Ultrasound: The use of high-frequency sound to create images of internal body structures.
Vascular: Related to blood vessels. Cerebrovascular disorders are those that affect the blood vessels in the brain. More about Cerebrovascular Surgery.
Vasodilatation: An increase in the diameter of blood vessels.
Vasopressin: A hormone secreted by the hypothalamus and stored in the posterior pituitary, which raises blood pressure and increases reabsorption of water by the kidneys.
Vasopressor: An agent which constricts the arteries and raises blood pressure.
Vasospasm: A state of spasm that tightens and narrows blood vessels around a brain aneurysm that are irritated by the blood from cerebral hemorrhage. The body's own attempt to prevent a second hemorrhage by restricting the flow of blood around the aneurysm.
Venous: Related to veins.
Ventricle: The cavities or chambers within the brain that contain the cerebrospinal fluid. There are two lateral ventricles and midline third and fourth ventricles.
Ventricular drainage: Insertion of a small tube into the ventricles to drain cerebrospinal fluid, usually when pressure is increased.
Ventriculitis: Inflammation and/or infection of the ventricles.
Ventriculo-atrial: Describing a cerebrospinal fluid shunt from one of the ventricles in the brain to the right atrium of the heart.
Ventriculo-peritoneal: Describing a cerebrospinal fluid shunt from one of the ventricles of the brain to the peritoneal cavity in the abdomen.
Ventriculogram: An x-ray study of the ventricles.
Ventriculomegaly: Enlarged cerebral ventricles. See also hydrocephalus.
Ventriculostomy: An opening into the ventricles of the brain, such as by inserting a small, thin, hollow catheter.
