Bug Report

LACRIMAL GLANDS: The tear producing glands that are located in a bone depression (fossae) in the upper outer angle of the orbit. Tears serve several functions, including lubrication, moisturizing, and antisepsis for the eyeball. Tears have both a mucus layer, as well as a more liquid layer, and are partially composed of cellulose. image

LAMINA: Any thin bone. The lamina of the spine (arcus vertebrae) is a thin bone plate extending posteriorly from the pedicles and fusing to provide the dorsal portion of the neural arch (surrounding the spinal cord), forming the base for the spinous process. image

LARYNX: The cartilage support structures that connect the superior trachea, the pharynx inferior to the tongue, and the hyoid bone. It supports the sphincter at the entrance to the trachea (the glottis or true vocal cords) and is therfore also the organ responsible for voice. image

LATERAL MASS (C1): The lateral portions of the atlas bone (C1) that connect the arches (anterior/posterior), the articulating surfaces (superior/inferior), and the transverse processes for the first vertebral segment. image

LATERAL PTERYGOID PLATE: A pair of projections (medial/lateral) from the greater wing of the sphenoid bone that forms the medial wall of the infratemporal fossa. The medial and lateral pterygoid muscles attach the mandible to the pterygoids. image

LATERAL SEMICIRCULAR CANAL: Part of the vestibular system of the inner ear that provides sensation for balance and "inertial guidance". The lateral semicircular canal contains the ductus semicircularis lateralis. image

LATERAL VENTRICLE: The CSF filled cavities located in each cerebral hemisphere. image

LATERAL (VIEW): Lateral is the opposite of medial/median. A side view. image

LATTISIMUS DORSI: Muscle that originates from the spines of the thoracic and lumbar vertebrae, thoracolumbar fascia, iliac crest, lower ribs, and inferior angle of the scapula, and inserts into the humerus (along the crest of the intertubercular sulcus). It is responsible for the adduction, extension, and medial rotation of the humerus.

LEFT ATRIUM: Chamber on the left side of the heart that recieves blood from the pulmonary veins, directing it to the left ventricle through the mitral valve. image

LEFT COLIC ARTERY: Artery which originates from the inferior mesenteric, and supplies the descending colon. image

LEFT COMMON CAROTID ARTERY: The artery that originates directly from the aortic arch and splits into the left internal and external carotid arteries.image

LEFT GASTROEPIPLOIC ARTERY: Originating from the splenic artery it branches into the gastric and omental arteries. image

LEFT MAINSTEM BRONCHI: Derived from the trachea, the left main bronchos that conducts air into the left lung. image

LEFT MARGINAL ARTERY: Artery which originates from the circumflex artery, and follows the left border of the heart, supplying the left ventricle. image

LEFT PULMONARY ARTERY: Artery originating from the main pulmonary trunk and branching into the arteries of the superior and inferior lobes of the left lung. image

LEFT VENTRICLE: The major systemic pumping chamber of the heart that directs blood out through the aorta and into the systemic arteries. image

LENS: The transparent biconvex structure of the eye that is located between the posterior chamber and vitreous body. The lens is living tissue, but is almost "crystalline" in composition and is "crystal clear". It is one of the driest tissues in the body, and therefore has low signal intensity on MR. image

LESSER CURVATURE (STOMACH): The medial/superior border of the stomach, site of attachment for the gastric mesentery. image

LESSER TROCHANTER (FEMUR) : A process on the medial surface of the posterior border of the neck of the femur. image

LESSER WING OF SPHENOID: The triangular plate of bone that extends from the anterior portion of the sphenoid bone and helps form the roof of the orbit and floor of the anterior cranial fossa. image

LEVATOR PALPEBRAE MUSCLE: Muscle responsible for raising the upper eyelid. It originates at the upper border of the optic foramen/orbital rim and inserts into the tarsal palate (cartilage) of the upper eyelid. image

LONGUS CAPITUS MUSCLE: Muscle responsible for flexing the head. It originates at the transverse processes of the third to the sixth cervical vertebrae, and inserts into the basal portion of the occipital bone. image

LONGUS COLLI MUSCLE: The long muscles of the neck, responsible for flexion and support of the cervical vertebrae.FONT> image

LP NEEDLE: Lumbar puncture needle. image

LUMBAR ARTERY: A segmental artery which originates from the abdominal aorta and branches into dorsal and spinal branches. image

LUMBAR SPINE: Portion of the vertebral column located between the thorax and the pelvis. image

LYMPH NODES: Regions of lymphoid tissue organized into lymphoid organs located along the lymphatic vessels. They are the main source of production of circulating lymphocytes and "filter" lymph to remove noxious agents. image

LYMPHATIC VESSELS: Vessels through which lymph is transported throughout the body. image

Bug Report
Portions © 1997 J.G. Smirniotopoulos, M.D. and others.