HABIT - An act, behavioral response,
practice, or custom established in one's repertoire
by frequent repetition of the same act.
HALIFAX - Clamp across lamina of C-1 and C-2.
HARRINGTON ROD - An instrumentation and fusion using
a straight, stiff rod for distraction or compression;
associated with a posterior spinal fusion in the thoracic
or thoracolumbar spine for scoliosis or trauma.
HEADACHE - Pain in various parts of the head, not confined
to the area of distribution of any nerve.
HEAT - A high temperature, the sensation produced by
proximity to fire or an incandescent object, as opposed
HEMANGIOMA - A benign tumor consisting of a mass of
HEMATOMYELIA - Effusion of blood (hemorrhage) into
the substance of the spinal cord.
HEMATORRHACHIS - Spinal apoplexy; hemorrhage into vertebral
HEMISPHERECTOMY - Excision of one cerebral hemisphere
undertaken for malignant tumors, intractable epilepsy
usually associate with infantile hemiplegia due to birth
injury and other cerebral conditions.
HEMATOMA - A blood clot.
HEMIANOPIA - Loss of vision of one-half of the visual
HEMIATROPHY - Atrophy of half of an organ or half of
HEMILAMINECTOMY - The excision of only one side of
the lamina (right or left) relative to other spinous
HEMIPLEGIA - Paralysis of one side of the body.
HEMORRHAGE - Bleeding due to the escape of blood from
a blood vessel.
HEREDITARY - Transmissible from parent to offspring
by information encoded in the parental germ cell.
HEREDITY - The transmission of characters from parent
to offspring by information encoded in the parental
germ cells. Genealogy.
HERNIATED INTERVERTBRAL DISC (HID) - Extrusion of part
of the nucleus pulposus material through a defect in
the annulus fibrosus. Otpouching of a disc.
HERNIATED NUCLEUS PULPOSUS (HNP) - Extrusion of the
central portion of an intervertebral disc through the
outer cartilaginous ring. The material can compress
the spinal cord or nerves in or exiting the spinal canal.
HERNIATION - Formation of a protrusion.
HETEROTOPIC BONE FORMATION - The occurrence of bone
growth in an abnormal location.
HIBBS SPINAL FUSION - A lumbar spinal fusion that includes
fusing the spinous process, lamina, and facet for stabilization.
HODGSON - Anterior approach to C-1 and C-2 area for
drainage of tuberculosis abscess.
HOOK - For spinal applications, a metallic medical
device used to connect spinal structures to a rod.
HORMONE - A chemical substance formed in one gland
or part of the body and carried by the blood to another
organ which it stimulates to functional activity.
HUMERUS - The bone of the arm, articulating with the
scapula above and the radius and ulna below.
HYDROCEPHALUS - A condition, often congenital, marked
by abnormal and excessive accumulation of cerebrospinal
fluid in the cerebral ventricles. This dilates the ventricles
and in infants and young children causes the head to
HYDROMYELIA - Expansion of the spinal cord due to increased
size of the central canal of the cord which is filled
HYDROXYAPATITE (HA) - The lattice-like structure of
bone composed of calcium and phosphorous crystals which
deposits on collagen to provide the rigid structure
HYOID BONE - Small, vertically oriented bones lateral
to trachea, located at the level of C-3.
HYPER - Excessive, above normal.
HYPERACUSIS - Abnormal acuteness of hearing or auditory
HYPERESTHESIA - Excessive sensibility to touch, pain
or other stimuli.
HYPEREXTENSION - Extension of a limb or part beyond
the normal limit.
HYPERFLEXION - Flexion of a limb or part beyond the
HYPERLORDOSIS - Increase in the normal anterior concavity
of the cervical or lumbar spine.
HYPERTENSION - High blood pressure.
HYPOPHYSECTOMY - Excision of the hypophysis cerebri.
HYPOPHYSIS CEREBRI - A gland of internal secretion
lying on the upper surface of the sphenoid (wedge shaped)
HYPOTHALAMUS - A collection of specialized nerve cells
at the base of the brain which controls the anterior
and posterior pituitary secretions, and is involved
in other basic regulatory functions such as temperature
control and attention.
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