The Supraspinous ligament is a strong band of connective tissue that runs along the tips of the spine’s spinous processes (the “bumps” you can feel in the midline of your back). It helps link many vertebrae together from the upper back down to the low back. Clinicians most often discuss it when evaluating spinal stability, injury, and certain types of back pain. It is also an important midline landmark during spine examinations and some procedures.

The Middle Cardiac Vein is a vein on the back surface of the heart. It helps drain “used” (oxygen-poor) blood from the heart muscle into the heart’s main venous channel, the coronary sinus. Clinicians most often mention it during heart imaging, electrophysiology procedures, and some surgical or catheter-based planning.

The Interspinous ligament is a band of fibrous tissue that connects the bony “spinous processes” of neighboring vertebrae. It is part of the back (posterior) ligament system that helps guide and limit spinal motion. It is commonly discussed in spine imaging reports, injury evaluations, and surgical planning.

The Great Cardiac Vein is a vein on the surface of the heart that helps drain blood from the heart muscle. It runs along the front and left side of the heart and usually empties into the coronary sinus. Clinicians most often refer to it during cardiac imaging, electrophysiology procedures, and device planning. It is part of the heart’s normal venous (vein) drainage system.

Ligamentum flavum is a pair of elastic spinal ligaments that connect the laminae (back parts) of adjacent vertebrae. It helps the spine move smoothly while supporting the spinal canal where nerves travel. Clinicians often discuss it when evaluating spinal stenosis, back and leg pain, or neck and arm symptoms. It is also a key tissue encountered in common spine injections and decompression surgeries.

The Coronary Sinus is a large vein on the back of the heart that collects most of the heart muscle’s venous blood. It drains into the right atrium, which is one of the heart’s filling chambers. Clinicians refer to the Coronary Sinus in cardiac imaging and in procedures that require access to the heart’s veins. It is especially important in electrophysiology and certain cardiac surgeries.

Posterior longitudinal ligament is a strong band of connective tissue that runs inside the spinal canal. It lies along the back of the vertebral bodies and intervertebral discs, from the neck down to the lower back. It helps support spinal alignment and interacts closely with the spinal cord and nerve roots. Clinicians commonly discuss it when evaluating disc herniation, spinal stenosis, trauma, and certain calcification/ossification conditions.

PDA most commonly means **patent ductus arteriosus**, a blood vessel connection that remains open after birth. It is a **congenital heart condition**, meaning it is present from birth. PDA is frequently discussed in **newborn medicine, pediatric cardiology, and adult congenital heart disease** care. Clinicians also use “PDA” as shorthand when planning tests and treatments that evaluate or close this connection.

The Anterior longitudinal ligament is a strong band of connective tissue that runs along the front of the spine. It helps stabilize the vertebrae and limits excessive backward bending of the neck and back. Clinicians discuss it when evaluating spine injuries, degenerative changes, and certain deformities. Spine surgeons also consider it during anterior (front-of-spine) surgical approaches.

The Posterior Descending Artery is a coronary artery that runs along the back side of the heart. It typically travels in a groove between the heart’s lower chambers (the posterior interventricular sulcus). It supplies blood to parts of the heart’s inferior (bottom) wall and the wall between the ventricles (septum). Clinicians commonly reference it in coronary angiography, heart attack evaluation, and bypass or stent planning.