LABYRINTH - The internal ear, comprising
the semi-circular canals, vestibule and cochlea.
LAMINA - The flattened or arched part of the vertebral
arch, forming the roof of the spinal canal. The posterior
part of the spinal ring that covers the spinal cord
LAMINECTOMY - Excision of one or more laminae of the
vertebrae. Removal of the lamina, the bony element covering
the posterior portion of the spinal canal.
LAMINOPLASTY - The lamina are hinged laterally opened
like a door, and secured in their new position with
suture or bone to enlarge the spinal canal.
LAMINOTOMY - An opening made in a lamina. Formation
of a hole in the lamina without disrupting the continuity
of the entire lamina to approach the intervertebral
disc or neural structures.
LAPAROSCOPY a form of minimally invasive surgery using
a type of endoscope known as a laproscope. The technique
allows surgeons to perform procedures without making
major incisions that can lead to long recovery times.
LASER - Light Amplification by Stimulated Emission
of Radiation. The device that produces a focused beam
of light at a defined wavelength that can vaporize tissue.
In surgery, lasers can be used to operate on small areas
without damaging delicate surrounding tissue.
LATERAL - Situated away from the midline of the body.
LATERAL MASS - The lateral expansion of the spinal
ring in the cervical spine, consisting of the facet
joints and intervening bone as well as a tunnel through
which the vertebral artery travels in the second through
fifth cervical vertebra.
LEEDS - For scoliosis, segmental wiring of a contoured
square-ended Harrington rod.
LEPTOMENINGES - Two thin layers of fine tissue covering
the brain and spinal cord (The pia mater and arachnoid).
LEPTOMENINGITIS - Inflammation of the membranes covering
the brain and spinal cord.
LEPTOMENINGOPATHY - Disease of the arachnoid or pia
matter of the brain and spinal cord.
LEUKODYSTROPHY - Disturbance of the white matter of
LEUKOENCEPHALITIS - An inflammation of the white matter
of the brain.
LIGAMENT - A band of flexible, fibrous connective tissue
that is attached at the end of a bone near a joint.
The main function of a ligament is to attach bones to
one another, to provide stability of a joint, and to
prevent or limit some joint motion.
LIGAMENTOUS - Relating to or of the form or structure
of a ligament.
LIGAMENTUM FLAVUM - A band of yellow elastic tissue
that runs between the laminae from the axis to the sacrum;
it assists in maintaining or regaining erect position
and serves to close in the spaces between the arches.
LIMBUS ANNULARE - A mass of bone situated at the anterospuerior
margin of a vertebra. Arises from failure of fusion
of the primary and secondary ossification centers.
LINEAR ACCELERATOR - Equipment that precisely delivers
a concentrated dose of radiation to a predetermined
target using x-rays.
LIPOMA - A benign fatty tumor, usually composed of
mature fat cells.
LOCALIO - For sacral tumor; a method for partial excision
of the scarum.
LOCALIZATION - Limitation to a definite area. The reference
of a sensation to its point of origin.
LONG BEACH PEDICLE SCREW - Posterolateral fusion screw
and rod device.
LONGISSIMUS COLLI - Long muscle immediately anterior
to the cervical spine.
LONG TRACTS - The nerve fibers that connect the voluntary
muscle messages from the brain.
LORDOSCOLIOSIS - Lateral curvature of the spine associated
with backward bending of the spine.
LORDOSIS - Curvature of the spine with the convexity
Not a disease state, but the normal anterior concavity
of the neck or low back.
LOUGHHEED and WHITE - For drainage of lower abdominal
abscess; coccygectomy and drainage from space anterior
LUMBAGO - A non-medical term signifying pain in the
lumbar region. Archaic term meaning back pain.
LUMBAR - The lower part of the spine between the thoracic
and the sacrum. The lumbar spine consists of five vertebrae.
The five moveable spinal segments of the lower back
and largestof the spinal segments.
LUMBAR CURVE - Curve with apex between the first and
the fourth lumbar vertebrae.
LUMBAR DRAIN - A device (usually a long, thin, flexible
tube) inserted through the skin into the cerebrospinal
fluid space of the lower back; provides a method of
draining cerebrospinal fluid.
LUMBARIZATION - Partial or complete formation of a
free-moving first sacral segment so that it looks like
a lumbar vertebra.
LUMBAR KYPHOSIS - Reverse of the normal curve of the
LUMBAR LORDOSIS - Angle made by lines drawn from the
superior surface of the first and fifth lumbar vertebra.
LUMBAR MICRODISCECTOMY - an operation on the lumbar
spine performed using a surgical microscope and microsurgical
LUMBOSACRAL CURVE - A lateral curve with its aspect
at or between the fifth lumbar vertebra.
LUMBOSACRAL JOINT ANGLE - Angle between the inferior
of the fifth lumbar vertebra and the top of the sacrum.
LUQUE INSTRUMENTATION -A posterior method of fixation.
LUQUE ISF - For posterolateral fusion fixation; a pedicle
screw and plate device.
LUXATION - Dislocation.
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