His Bundle is a short tract of specialized heart muscle that carries electrical signals from the upper chambers to the lower chambers. It sits at the junction between the atria (top chambers) and ventricles (bottom chambers). It is a key part of the heart’s conduction system, which coordinates each heartbeat. Clinicians most often discuss it during evaluation and treatment of heart rhythm and pacing problems.
Central canal most commonly refers to the central space within the spine that houses the spinal cord and nearby nerves. It is also a term used for a tiny channel inside the spinal cord, but in routine spine care it usually means the spinal canal. Clinicians discuss the Central canal when describing spinal stenosis, disc problems, trauma, tumors, or infection. It is frequently referenced in MRI and CT reports of the neck (cervical), mid-back (thoracic), and low back (lumbar).
The Bundle of His is a short segment of the heart’s electrical wiring system. It carries the electrical signal from the atrioventricular (AV) node to the ventricles. It is commonly discussed when interpreting ECGs and diagnosing conduction problems. It can also be a clinical target in specialized pacemaker procedures.
The Spinal canal is the hollow space inside the spine that protects the spinal cord and nerve roots. It runs from the base of the skull through the neck, mid-back, and low back. Clinicians use the term when describing MRI or CT findings such as “stenosis” (narrowing). It is also a key reference point in spine surgery planning and neurological exams.
The AV Node is a small cluster of specialized heart cells that helps control how electrical signals travel from the upper to the lower chambers. It sits at the center of the heart’s electrical “wiring,” between the atria and the ventricles. Its job is to slow and coordinate signals so the heart pumps in an organized sequence. Clinicians commonly reference the AV Node when interpreting ECGs, evaluating palpitations, or treating certain arrhythmias.
The Sympathetic chain is a paired nerve pathway that runs along the front and sides of the spine from the neck to the pelvis. It is part of the autonomic nervous system, which controls “automatic” body functions like blood flow, sweating, and temperature regulation. Clinicians discuss it often when evaluating certain pain patterns, circulation problems, or sweating disorders. It is also a key anatomic structure to recognize during spine, chest, and vascular procedures.
The Atrioventricular Node is a small cluster of specialized heart cells that helps control the timing of each heartbeat. It sits between the atria (upper chambers) and ventricles (lower chambers) and relays electrical signals from top to bottom. It is commonly discussed when evaluating heart rhythm problems, slow heart rates, or “heart block.” It is also a key concept in electrocardiograms (ECGs) and in electrophysiology (EP) procedures.
Radicular nerve is a term used to describe a spinal nerve root as it leaves the spinal cord region and travels toward the arm or leg. It is commonly discussed when symptoms “radiate” along a limb, such as sciatica or arm pain from the neck. Clinicians use the concept to match symptoms and exam findings to a specific spinal level. It is also used to plan imaging, injections, and—when needed—surgical decompression.
The SA Node is a small cluster of specialized heart cells that normally starts each heartbeat. It sits in the upper right chamber of the heart (the right atrium) near where a major vein enters. It acts like the heart’s natural “pacemaker” by generating electrical signals. Clinicians commonly reference it when interpreting an ECG, evaluating palpitations, or assessing slow or fast heart rhythms.
A Nerve root is the first segment of a spinal nerve as it exits the spinal cord region. It carries sensory and motor signals between the spinal cord and a specific body region. Clinicians often discuss the Nerve root when evaluating radiating neck, back, arm, or leg symptoms. It is also a key target in spine imaging, electrodiagnostic testing, injections, and decompression surgery.