Dorsal root is the sensory (feeling) branch of a spinal nerve. It carries signals like pain, touch, temperature, and vibration from the body to the spinal cord. Dorsal root is discussed in spine care when symptoms such as radiating pain, numbness, or tingling suggest nerve irritation. It is also a target in some diagnostic tests and interventional pain procedures.

The Cardiac Skeleton is a strong framework of dense connective tissue inside the heart. It supports the heart valves and helps the heart keep its shape during each beat. It also electrically separates the upper and lower chambers, guiding how impulses travel. Clinicians and trainees most often discuss it in valve disease, imaging, and heart surgery.

Cardiac Base is an anatomical term for the broad “top” portion of the heart where the great vessels connect. It is the region opposite the heart’s tip (the apex). Clinicians use it to describe where heart sounds are heard, where structures are located on imaging, and where disease may be centered. You may see the term in anatomy lessons, echocardiography reports, CT/MRI descriptions, and surgical discussions.

Filum terminale is a thin strand of connective tissue at the very end of the spinal cord. It helps anchor the spinal cord within the spinal canal. Clinicians most often discuss it when evaluating tethered cord–type conditions. It is also a standard anatomical structure described in spine and neuroanatomy.

Cauda equina is the bundle of spinal nerve roots that continues below the end of the spinal cord in the lower back. Its name means “horse’s tail,” describing how the nerves fan out in the spinal canal. It is commonly discussed in spine care because these nerves control sensation and movement in the legs and important pelvic functions. Clinicians use the term when describing anatomy, interpreting MRI findings, and evaluating urgent neurologic symptoms.

Cardiac Apex is the pointed, lower tip of the heart where the left ventricle tapers. It sits in the left side of the chest and helps define where the heart’s “beat” is often felt. Clinicians use it as a landmark in the physical exam and in cardiac imaging. It is also referenced in some heart procedures that involve access near the left ventricular tip.

Conus medullaris is the tapered, lower end of the spinal cord. It sits inside the spinal canal, usually around the upper lumbar spine. It is a key anatomical landmark on spine MRI and during many spinal procedures. Clinicians use the term when discussing spinal cord level, nerve function, and certain emergencies.

The Spinal cord is a long bundle of nerve tissue that connects the brain to the body. It runs inside the spinal canal, protected by the vertebrae (spinal bones). It carries movement, sensation, and autonomic (automatic body function) signals. It is central to how spine specialists evaluate and treat neurologic problems related to the neck and back.

The Interatrial Septum is the wall of tissue that separates the heart’s two upper chambers (the right atrium and left atrium). It helps keep oxygen-poor and oxygen-rich blood on the correct sides of the heart. Clinicians commonly reference it during heart imaging and during certain catheter-based procedures. It is also central to understanding openings or defects between the atria, such as a patent foramen ovale (PFO) or atrial septal defect (ASD).

The Interventricular Septum is the wall of heart muscle that separates the left and right ventricles. It helps keep oxygen-rich blood on the left side and oxygen-poor blood on the right side. Clinicians refer to it in heart imaging, electrocardiograms, and structural heart assessments. It is also important in certain cardiomyopathies, heart attacks, and congenital heart conditions.