The jugular notch is the visible, fingertip-sized dip at the top of your breastbone, centered between the inner ends of your two collarbones. You can feel it right now by running a finger down the front of your throat until it drops into a shallow, concave hollow just above the chest. Anatomists also call it the suprasternal notch or the “sternal notch,” and despite its simple appearance, this small depression serves as a surprisingly important landmark in emergency medicine, cardiac imaging, surgery, forensic science, and even wearable health technology.
What Exactly Is the Jugular Notch
The notch is formed by the upper border of the manubrium, the thick, trapezoidal top segment of the sternum. The manubrium is the part of the breastbone that connects to the first pair of ribs and to both clavicles, making it a structural keystone for the upper chest. The concavity itself faces upward and slightly forward, and its depth and width vary from person to person. A forensic study of sternums from Northwest India found that the shape of the jugular notch differs meaningfully between sexes and age groups: most subjects had a “deep and narrow” notch, and the variation in shape was statistically significant enough to help distinguish male from female remains and younger from older individuals.1Forensic Science International. Sex and age related non-metric variation of the human sternum in a Northwest Indian postmortem sample: a pilot study
The name “jugular” comes from the Latin jugulum, meaning throat or collarbone area. It does not refer to the jugular veins specifically, although those veins do run in the general neighborhood. The notch sits at roughly the level of the second or third thoracic vertebra, which places it right at the boundary between the neck and the chest cavity. That border zone is why it keeps showing up in so many different clinical contexts: it is the gateway between two anatomical compartments, and a lot of critical anatomy is packed just behind it.
The Surprisingly Crowded Space Beneath It
If the jugular notch looks quiet on the surface, the space directly behind it is anything but. Major blood vessels, the trachea, the esophagus, and the tops of the lungs all converge within centimeters of this bony dip. A large imaging study using CT scans found that in over half of adults, part of a major blood vessel sits right in front of the trachea at the level of the suprasternal notch, most commonly the brachiocephalic artery (also called the innominate artery). At the notch itself, roughly 53% of scans showed a vessel in that position; moving just one centimeter higher, only about a quarter did, and by three centimeters above the notch, only 1% of scans showed a vessel there.2PubMed. Prevalence of major vessels anterior to the trachea at sites of potential front-of-neck emergency airway access in adults
The brachiocephalic artery is the first large branch off the aortic arch, and its position varies quite a bit. A topographic classification study found that this artery was “cervical” or “high-riding,” meaning it extended up to or above the level of the suprasternal notch, in about 49% of people. It reached or crossed the plane of the notch in roughly 64% of cases. By contrast, the aortic arch itself and the left brachiocephalic vein were high-riding in only about 3% and 5% of people, respectively.3PubMed Central. Major Vessels of the Interclavicular Suprasternal Space: A Suprasternal Notch-Referenced Topographic Classification with Potential Procedural Relevance This matters enormously for any procedure that involves approaching the trachea from the front of the neck, because a doctor performing an emergency surgical airway needs to know whether a large artery is sitting in the way.
A Window Into Your Breathing
One of the most practical everyday uses of the jugular notch is something parents, nurses, and emergency physicians watch for constantly: suprasternal retractions. When someone, especially a child, is struggling to breathe because of an obstruction in the upper airway, the soft tissue in and around the jugular notch visibly sinks inward with each labored breath. This happens because the person is generating abnormally strong negative pressure inside the chest to pull air past a narrowed or blocked airway. Suprasternal retractions, along with stridor (a high-pitched breathing sound) and voice changes, are considered sentinel signs of upper airway obstruction.4PubMed. Acute upper airway obstruction
Watching for retractions at the jugular notch is one of the first things taught in pediatric emergency assessment. Because the notch is easy to see even through clothing and doesn’t require any equipment to evaluate, it provides an immediate visual signal that a child’s breathing effort has become dangerously high. In adults, the same sign can appear during severe asthma attacks, anaphylaxis, or anything else that critically narrows the upper airway.
An Acoustic Window to the Aorta
Place an ultrasound probe in the jugular notch, angle it downward toward the chest, and you get a remarkably clear view of the aortic arch and the great vessels branching off it. This “suprasternal notch view” has been used in cardiac ultrasound for decades, and its value is hard to overstate. Because the notch sits right above the aortic arch with relatively little tissue in between, sound waves travel a short path and produce good images of structures that are otherwise hard to reach from standard echocardiographic windows on the chest wall.
The technique was described in pediatric cardiology as early as the late 1970s and studied in over a thousand children with congenital heart disease. In the long-axis view, with the transducer angled between the right nipple and left shoulder blade, the entire aortic arch, the branching head and neck vessels, and even the right pulmonary artery can be imaged. This view proved valuable for evaluating coarctation of the aorta (a dangerous narrowing), hypoplastic left heart syndrome, and other congenital anomalies. A short-axis view, obtained by rotating the transducer into a coronal plane, reveals the transverse aorta, pulmonary artery, left atrium, and the veins draining into the heart from above.5PubMed. Suprasternal notch echocardiography: a two-dimensional technique for evaluating congenital heart disease Pediatric cardiologists consider the suprasternal examination an essential part of a standard echocardiographic workup in children.6PubMed. Suprasternal notch echocardiography. Assessment of its clinical utility in pediatric cardiology
In adults, the suprasternal notch view has gained renewed interest as a tool for rapid assessment in the emergency department. A study of 79 patients compared aortic measurements taken from this view using bedside ultrasound with those from CT angiography. The suprasternal view was obtainable in 97% of patients, and emergency physicians rated it as “easy” to acquire in about two-thirds of cases. The measurements were impressively close to the CT standard, with mean differences of roughly a millimeter at most locations along the aorta.7PubMed Central. Evaluation of the Aortic Arch from the Suprasternal Notch View Using Focused Cardiac Ultrasound For a bedside technique that takes minutes and requires no radiation, that level of accuracy is remarkable. It gives emergency doctors a fast way to screen for aortic dilation or dissection when time is critical.
The Surgical Reference Point
Surgeons use the jugular notch as a fixed anatomical reference in a wide variety of operations, from thyroid removal to breast reconstruction, and even during emergency airway procedures. It is a reliable surface landmark because it barely moves with posture changes and is easy to palpate in almost everyone regardless of body habitus.
In thyroid surgery, the notch is central to defining and managing substernal goiters, which are enlarged thyroids that grow downward behind the breastbone. The American Thyroid Association defines a substernal goiter as a thyroid that protrudes radiologically or clinically below the sternal notch or clavicle when the patient is lying with the neck slightly extended.8PubMed Central. Substernal Goiter: From Definitions to Treatment Other definitions in the literature use the notch as a measuring starting point: some define it as 50% or more of the thyroid mass extending below the notch, while others use a threshold of three or more centimeters of extension beyond the notch.9PubMed Central. Extracervical Approaches to Substernal Thyroid Goiter Resection: A Systematic Review and Meta-Analysis
These distinctions are not academic hairsplitting. How far a goiter extends below the jugular notch directly affects the surgical approach. A study of substernal goiter surgeries found that when the goiter extended five or more centimeters below the sternal notch into the mediastinum, the need for a sternotomy (splitting the breastbone) could be predicted with 94% sensitivity and about 87% specificity.10PubMed. Depth of mediastinal extension can predict sternotomy need for substernal thyroid goiters In other words, the jugular notch provides the zero-point from which surgeons gauge whether a relatively routine neck operation will become a much larger and riskier chest surgery.
The notch also matters in central line placement. When doctors need to insert a catheter into the subclavian vein for intravenous access, the suprasternal notch is one of the surface landmarks used to guide the needle’s trajectory.11Anesthesia & Analgesia. An Anatomic Landmark to Simplify Subclavian Vein Cannulation: The “Deltoid Tuberosity” In breast reduction surgery, the distance from the sternal notch to the nipple is a standard measurement for planning how much tissue to remove and where to reposition the nipple. One series of breast reductions using a semicircular technique reported an average reduction of about 13 centimeters in the sternal-notch-to-nipple distance.12PubMed Central. Semicircular Horizontal Approach in Breast Reduction: Clinical Experience in 38 Cases
Thyroid Cancer and Suprasternal Lymph Nodes
A less well-known clinical role for the jugular notch region involves the lymph nodes that sit just behind it, in the suprasternal space. In patients with papillary thyroid cancer that has already spread to lymph nodes on the side of the neck, there is a meaningful chance that cancer has also reached these suprasternal nodes. One study of 85 such patients found that about 13% had confirmed suprasternal lymph node metastasis at surgery. This spread was more likely when the primary tumor sat in the lower part of the thyroid gland and when lymph nodes at a particular level low in the neck (level IV) were also involved. Having two or more positive level IV nodes was the strongest predictor.13Gland Surgery. Risk factors of suprasternal lymph node metastasis in papillary thyroid carcinoma with clinical lateral cervical lymph node metastasis This finding has implications for how thoroughly surgeons need to dissect the area around the jugular notch during thyroid cancer operations.
Vulnerability to Penetrating Injury
The jugular notch is one of the most vulnerable spots on the human torso because it is the only point where the central chest contents are not protected by bone. The sternum shields the heart and great vessels below, and the cervical spine protects from behind, but the notch itself is essentially a soft-tissue window into the upper mediastinum. Penetrating injuries in this area can be catastrophic.
A case report described a polytrauma patient who arrived at the hospital with a ballpoint pen lodged just above the sternal notch. On surgical exploration via sternotomy, the pen was found to have penetrated the anterior wall of the aortic arch and was resting inside its lumen.14PubMed Central. An unusual occurrence of penetrating aortic arch injury by a ball-point pen: a case report and review of the literature Another case involved a gunshot wound to the neck in the same zone that damaged both the right common carotid and right subclavian arteries, requiring emergency ligation of both vessels.15PubMed Central. Penetrating neck injury: Collaterals for another life after ligation of common carotid artery and subclavian artery Cases like these underscore why the jugular notch region is classified as “zone I” of the neck in trauma surgery, the zone considered most dangerous because of the concentration of great vessels and the difficulty of gaining surgical control there.
Even without penetrating trauma, the vessels behind the notch can occasionally cause trouble on their own. When the brachiocephalic artery becomes abnormally dilated or tortuous with age, it can bulge upward into the suprasternal space and present as a visible, pulsating lump. This can be alarming for the patient and tricky for doctors to diagnose, since the differential includes aneurysms and tumors. One reported case involved a 70-year-old woman with a pulsating suprasternal lump caused by innominate artery dilatation combined with a common origin of the left common carotid and innominate arteries, an anatomic variant that required surgical reimplantation to resolve her shortness of breath.
Wearable Sensors and the Jugular Notch
A newer and somewhat unexpected role for the jugular notch is in digital health monitoring. Researchers developing soft, skin-worn sensors for tracking breathing and swallowing have found that the suprasternal notch is often the ideal placement site for one of the two sensors in a dual-sensor system. The notch captures throat vibrations and mechanical movements from swallowing, while a second sensor placed slightly lower on the breastbone captures chest-wall motion from breathing. By comparing the two signals, the system filters out noise from body movement and isolates the respiratory and swallowing patterns the clinicians actually want to see.16npj Digital Medicine. Soft skin-interfaced mechano-acoustic sensors for real-time monitoring and patient feedback on respiratory and swallowing biomechanics
The notch works well for this because it is mechanically coupled to both the trachea and the larynx, it moves with swallowing, and it is relatively stable during general physical activity. For patients whose swallows produce only small throat movements, the sensor can be shifted slightly higher, up to the laryngeal prominence (“Adam’s apple”), to boost signal strength. This kind of real-time monitoring has applications in rehabilitating patients with swallowing disorders after stroke or head and neck surgery, where knowing whether a patient is swallowing safely can prevent aspiration pneumonia.
How the Notch Forms Before Birth
The embryonic development of the manubrium, and therefore the jugular notch, turns out to be more complex than anatomy textbooks have traditionally suggested. Detailed study of human embryos has shown that the manubrium does not simply develop from the sternal bands (paired strips of cartilage that grow toward each other and fuse at the midline to form most of the sternum). Instead, the upper portion of the manubrium arises primarily from a distinct mass of tissue called the interclavicular mesenchyme, which is continuous with the developing clavicles.17PubMed. Morphogenesis of the manubrium of sternum in human embryos: a new concept
Because parts of the clavicle develop from neural crest cells (the same embryonic cell population that gives rise to much of the face and skull), the interclavicular tissue that forms the top of the manubrium likely shares that origin. The sternal bands, by contrast, come from a different embryonic layer. The two tissues eventually merge, with the small upper end of the sternal bands integrating into the interclavicular region to form the complete primitive manubrium. The sternoclavicular joints and their ligaments also develop from this same interclavicular tissue. So the jugular notch sits at a developmental crossroads where at least three distinct embryonic cell populations converge, which may help explain why the shape and depth of the notch vary so much between individuals and why congenital sternal anomalies, though rare, tend to cluster in this area.