A 
ABDOMINAL AORTA:
The continuation into the abdomen of the thoracic aorta, which divides into the two common iliac arteries.
image
image
image
Abdominal Aortic Aneurysm
ABDUCT:
A movement away from the medial plane (see also antonym - ADDUCT). In the orbit, the abducens nerve supplies the lateral rectus muscle that pulls the eye laterally outward. Vocal Cords ABDUCTED and ADDUCTED (laryngeal tomograms).
image
ACETABULUM:
A large cup-shaped cavity that is the point of articulation between the femur and the os coxae of the pelvis. image
ACROMIOCLAVICULAR JOINT:
The articulation between the acromion process and clavicle.
image
image
image
ACROMION PROCESS:
The vertical extension of the scapula, above the glenohumeral joint. (from the Greek "acros", literally the "end" or the "top" - like the "acropolis" in Athens, the "top" of the city)
image
image
image
image
ADDITUS AD ANTRUM:
The mastoid air spaces connecting the mastoid antrum with the epitympanic recess.
image
ADDUCT (adductor magnus):
A movement toward the midline. The adductor magnus muscle in the thigh pulls the leg toward the medial plane.
image
ADRENAL GLAND:
The gland located superior to the kidney which is responsible for the production of epinephrine. ("epi" - above + "nephros" - kidney)
image
image
image
ANGIOGRAPHY:
An radiologic procedure that produces images of blood vessels (ateries and veins). Angiographic images can be constructed by MR (MRA), CT (CTA), and by conventional X-ray techniques using a cather injection.
image
ANGLE OF LOUIS:
The point of junction between the manubrium and the body of the sternum.
image
ANKLE JOINT:
A "mortise and tenon" joint between the two bones of the lower leg (tibia and fibula) and the talus of the foot.
image
ANTERIOR ARCH (C1):
The curved structure located at the forward part of the atlas (ventral side of body).
image
image
ANTERIOR RIB:
The portion of the rib locted on the ventral side of the body.
image
ANTERIOR TIBIAL ARTERY:
Artery originating from the popliteal artery and branching into the posterior and anterior tibial recurrent, and lateral and medial anterior malleolar arteries, and lateral and medial malleolar retes.
image
ANTERIOR URETHRA:
The part of the male urethra that extends from the bulb to the meatus of the glans penis.
image
ANTRUM:
An entry or opening cavity or chamber.
ANTRUM OF STOMACH:
The dilated portion of the pyloric region of the stomach, near the junction with the duodenum.
image
ANEURYSM:
The dilation of the wall of an artery, vein, or the heart, that forms a sac-like structure.
image
ANTERIOR CLINOID PROCESS:
The bony process located on the medial end of the posterior border of the lesser wing of the sphenoid bone.
image
AORTA:
The main trunk of the arterial system which originates from the left ventricle of the heart and extends to the level of the fourth lumbar vertebra.
image
Abdominal Aortic Aneurysm
Abdominal Aortic Aneurysm
Abdominal Aortic Aneurysm
AORTIC ARCH:
The portion of the aorta which bends over inorder to extend into the thorax.
image
image
AORTIC BIFURCATION:
The point where the abdominal aorta divides into the two common iliac arteries.
image
AORTIC SINUS:
Dilations of the aortic wall superior to each valve.
image
AP VIEW:
A front to back view of the body.
image
APEX OF HEART:
The bottom most portion of the heart, formed by the left ventricle.
image
APPENDIX:
(Veriform appendix) appendage of the cecum.
image
ARTERIOGRAM:
A radiograph of arteries after they have been injected with a contrast material.
image
ATHEROMATOUS PLAQUE:
image
ARTHROGRAM:
A roentgenographic record of a joint after the introduction of contrast material.
image
image
image
ARTICULAR CARTILAGE:
Usually hyaline, located on the articular surfaces of bones within a synovial joint.
image
ARTICULAR FOSSA:
A hollow of depressed area within a joint.
image
ARTICULAR SURFACE:
The surfaces of bone or cartilage which form a joint.
image
ARYTENOID CARTILAGE:
Paired cartilage of the larynx which articulates with the lamina of the cricoid cartilage.image
ASCENDING AORTA:
The portion of the aorta that originates from the left ventricle and gives rise to the right and left coronary arteries.
image
ASCENDING COLON:
The part of the colon that lies between the cecum and the right colic flexure.
image
ATLAS and AXIS:C1 (the atlas) sits atop C2 (the axis) and can rotate about the dens - a vertical post from C2.
image
image
FX C2 Axis
ATRIAL APPENDAGE:
The ear-shaped appendage of either atrium of the heart.
image
AV GROOVE:
A groove on the surface of the heart which separates the atria from the ventricles.
image
AXIAL VIEW:
The axial imaging plane is a "cross-section" - perpendicular to the long axis of a cylinder.
NOTE: For vertebrate anatomy, this is parallel to the floor for humans (bipedal) and perpendicular to the floor for quadruped.
image
AXILLARY VEIN:
The continuation of the basilic vein which ends at the lateral border of the first rib, becoming the subclavian vein.
image
AZYGOUS ARCH:
The point where the azygous vein arches over the root of the right lung to empty into the superior vena cava.
image
AZYGOUS LOBE:
A normal variant produced by an indentation in the R. upper lobe of the lung by four layers of pleura (two layers of visceral pleura and two layers of parietal pleura). It is produced by invagination of the azygous vein. This is not a true lobe, since it does not have a separate bronchus.
image
Azygous Lobe.
AZYGOESOPHAGEAL RECESS:
An area of lucency on the frontal chest image, representing a portion of the Right lower lobe that crosses the midline anterior to the spine, and ends at the azygous vein and or the esophagus.
image
image
image
AZYGOUS VEIN:
A vertical paraspinal vein that connects the superior venae cava with abdominal veins.
image
Bug Report
Portions © 1997, 2002 J.G. Smirniotopoulos, M.D. and others.