Glossary
- 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 enlarge.
- HYDROMYELIA
- Expansion of the spinal cord due to increased size of the central canal of the cord which is filled with CSF.
- HYDROXYAPATITE (HA)
- The lattice-like structure of bone composed of calcium and phosphorous crystals which deposits on collagen to provide the rigid structure of bone.
- 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 sensation.
- 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 normal limit.
- 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) bone.
- 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.
- IDIOPATHIC SCOLIOSIS
- Structural lateral curvature of an unknown cause.
- ILIAC BONE
- A part of the pelvic bone that is above the hip joint and from which autogenous bone grafts are frequently obtained.
- ILIAC CREST
- The large, prominent portion of the pelvic bone at the belt line of the body.
- ILIOPSOAS MUSCLE
- Large muscles starting at L-1 and becoming wider as it picks up segments from the lower lumbar spine; combines with the iliacus muscle before attaching to the lesser trochanter of the hip.
- IMMOBILIZATION
- Limitation of motion or fixation of a body part usually to promote healing.
- IN VITRO
- Describing biological phenomena that are made to occur outside the living body traditionally in a test tube. In vitro is Latin for in glass.
- IN VIVO
- Within a living body. In vivo is Latin for in life.
- INFANTILE SCOLIOSIS
- Lateral curvature of the spine that begins before age 3.
- INFERIOR
- Situated below or directed downward.
- INFORMED CONSENT
- Consent of the patient who has received sufficient information to have surgery, receive medication, or participate in a clinical study.
- INFRATENTORIAL
- Beneath the tentorium.
- INFUNDIBULUM
- A stalk extending from the base of the brain to the pituitary gland.
- INSTITUTIONAL REVIEW BOARD (IRB)
- A committee designated by an institution, such as a hospital, to review and approve research projects; e.g., clinical studies in that institution.
- INSTRUMENTATION
- the use of instruments such as metal screws or braces during a surgical procedure to support bone as it heals.
- INTERBODY
- between the bodies of two adjacent vertebrae
- INTERCOSTALS
- The muscles between the ribs.
