The lingual artery is the principal blood supply to the tongue, the floor of the mouth, and a handful of surrounding structures. It typically branches off the external carotid artery at roughly the level of the hyoid bone, then takes a winding path deep into the tongue’s muscular core. For most people, the lingual artery is invisible and unremarkable, but for surgeons, interventional radiologists, and anyone facing oral or throat cancer, its anatomy and behavior carry real consequences. The vessel’s location is less predictable than textbook diagrams suggest, and its management can mean the difference between a routine procedure and a life-threatening bleed.
Where It Runs and What It Supplies
The lingual artery arises from the front surface of the external carotid artery, usually at the level of the greater horn of the hyoid bone. From there it loops upward and forward, passing deep to the hyoglossus muscle, a thin sheet of muscle that forms part of the tongue’s underside and serves as a key surgical landmark.1PubMed Central. Anatomical variability of the lingual artery: a comprehensive narrative review with clinical and surgical applications The artery then gives off branches in stages as it travels forward: the suprahyoid artery near the hyoid bone, the dorsal lingual branches supplying the back of the tongue and nearby structures, the sublingual artery feeding the floor of the mouth, and finally the deep lingual artery, which is essentially the terminal continuation running along the underside of the tongue all the way to its tip.
One underappreciated feature of the tongue’s blood supply is how well it is partitioned. A fibrous midline wall called the lingual septum divides the tongue into left and right halves, and each half gets its own lingual artery. Except for a small network of vessels in the mucous membrane on top of the tongue, the two sides have almost no cross-communication. Arterial connections across the septum are rare and small, typically only about 2 mm in diameter.2PubMed. Anatomic bases of tongue flaps This separation matters a great deal in surgery: cutting off one lingual artery does not automatically doom the entire tongue, because the other side maintains its own independent supply. But it also means each half is vulnerable if its own artery is damaged with nothing to fall back on.
The Surgical Triangles That Help Surgeons Find It
Because the lingual artery runs hidden beneath muscle, surgeons approaching from outside the neck need reliable surface landmarks to locate it. Over the past two centuries, anatomists have described several small triangles in the neck that serve as guides. The three most clinically relevant for the lingual artery are Lesser’s triangle, Pirogov’s triangle, and Béclard’s triangle.
Lesser’s triangle is bounded by the two bellies of the digastric muscle and the hypoglossal nerve. Its floor is the hyoglossus muscle, and the lingual artery lies directly beneath that floor. In cadaver studies, this triangle was present in about 88% of specimens. When it was absent, the reason was usually that the hypoglossal nerve ran below the digastric muscle instead of between its bellies. Lesser’s triangle is considered a go-to landmark for getting to the lingual artery when a surgeon needs to control a severe bleed in the floor of the mouth.3Anatomy & Cell Biology. Triangles of the neck: a review with clinical/surgical applications
Pirogov’s triangle, named after the Russian surgeon Nikolai Pirogov, is essentially the back portion of Lesser’s triangle. It is defined by the hypoglossal nerve above, the intermediate tendon of the digastric muscle behind and below, and the posterior edge of the mylohyoid muscle in front. In one study it appeared in about 88% of specimens, while another found it in only about 58%, suggesting its reliability varies by population and dissection method. The lingual artery was consistently found deep to the hyoglossus within it.4Anatomy & Cell Biology. Triangles of the neck: a review with clinical/surgical applications
Béclard’s triangle sits a bit further back, bordered by the posterior belly of the digastric muscle, the posterior edge of the hyoglossus, and the greater horn of the hyoid bone. It was found in about 82% of specimens and consistently contained both the lingual artery and the hypoglossal nerve, making it useful for identifying both structures at once.5Anatomy & Cell Biology. Triangles of the neck: a review with clinical/surgical applications Despite their long history, these triangles are sometimes called “forgotten” landmarks because they receive less attention in modern surgical training than they deserve.6PubMed Central. Forgotten triangles of neck
How Often the Anatomy Surprises You
Textbooks tend to depict the lingual artery as a standalone branch of the external carotid, neatly arising between the superior thyroid artery below and the facial artery above. In reality, the picture is messier. The lingual artery shares a common trunk with the facial artery in a substantial minority of people, and less commonly it can share a trunk with the superior thyroid artery or even arise from the common carotid artery itself.
A scoping review of imaging and cadaver studies found that the “typical” pattern, where the superior thyroid, lingual, and facial arteries each arise independently, was present in only about 50 to 90% of cases. A linguo-facial trunk, where the lingual and facial arteries share a single origin, turned up in roughly 7 to 24% of cases. A thyro-lingual trunk occurred in about 1 to 10%, while a thyro-linguo-facial trunk, with all three sharing one origin, appeared in up to about 3%. Truly aberrant origins from the common carotid or the carotid bifurcation showed up in about 1 to 7%.7PubMed Central. Mapping the lingual artery: a scoping review and proposed imaging-informed risk classification for surgical and radiological practice
One cadaver study proposed a classification system with multiple course types and found that while most lingual arteries arose from the external carotid as expected, some originated from the facial artery or even the submental artery.8PubMed. Gross anatomical classification of the courses of the human lingual artery These variations are not merely academic curiosities. A surgeon who assumes the lingual artery will be exactly where the textbook says risks inadvertently cutting it or, conversely, failing to find it when they need to tie it off during a hemorrhage.
Relationship to the Hypoglossal Nerve
The hypoglossal nerve, which controls the tongue’s movement, runs in close company with the lingual artery. Their spatial relationship is a daily concern during neck dissections and transoral surgeries for throat cancer. In a study of 33 surgical cases, the lingual artery was found directly deep to the hypoglossal nerve about 64% of the time. In another 21% of cases, the artery sat within 5 mm below the nerve. Only about 6% of the time was the artery above the nerve.9PubMed. Lingual Artery Identification for Ligation in Neck Dissection and Transoral Surgery for Oropharyngeal Tumors This tells surgeons that if they find the hypoglossal nerve, the lingual artery is almost always right beneath it, but they should be prepared for the occasional case where it is not.
A three-dimensional mapping study of the artery’s main trunk found that it runs for about 32 mm on average before giving off any major branches. That stretch of unbranched trunk has been interpreted as a surgical safe zone for transoral robotic surgery on the base of the tongue, since incisions in that area are less likely to encounter a branch that could bleed profusely if nicked.10PubMed. A 3D map of the lingual artery-The perfect tool for transoral robotic surgeries on the base of tongue
The Lingual Artery in Cancer Surgery
Cancers of the tongue and the base of the tongue are some of the most challenging tumors to operate on, precisely because the lingual artery and its branches permeate the tissue that needs to be removed. The artery is both an obstacle and a resource during these procedures.
It is an obstacle because cutting into it causes rapid, hard-to-control bleeding. But it is also a resource because the artery can serve as a recipient vessel for microsurgical reconstruction. After removing a tumor, surgeons often need to rebuild the defect with a free tissue flap, a piece of tissue transplanted from elsewhere in the body and connected to local blood vessels. In patients who have already had neck surgery and whose usual recipient vessels are scarred or missing, the lingual artery can fill the gap. A five-year single-institution series found that using the contralateral lingual artery as a recipient vessel for second or third free flaps in patients with recurrent oral cancers worked without causing tongue or floor-of-mouth tissue death, and without injuring the hypoglossal nerve.11PubMed Central. Lingual Artery as the Recipient Vessel of Choice in Patients Requiring a Second or Third Free Flap in Recurrent Oral Cancers and Vessel-Depleted Neck: A 5-Year Experience in a Single Institute
Preserving both lingual arteries when possible is a priority. A case series describing a midline split approach for tumors at the root of the tongue showed that removing the cancer through the midline while keeping both lingual arteries intact allowed for good postoperative recovery of swallowing and speech.12PubMed. Resection of Tumors at the Root of the Tongue and Free Flap Reconstruction: Midline Split With Bilateral Lingual Artery Preservation Losing both lingual arteries would leave the entire tongue without its primary blood supply, a scenario that can lead to devastating tissue loss.
Stopping a Bleed Without Open Surgery
When the lingual artery bleeds, whether from trauma, surgery, or a tumor eroding into the vessel wall, the results can be dramatic. The tongue and floor of the mouth are highly vascular, and a ruptured lingual artery can produce life-threatening hemorrhage quickly. Historically, the response was to open the neck surgically and tie off the artery. Today, interventional radiologists offer a less invasive alternative: embolization, where tiny particles or glue-like substances are threaded through a catheter and injected directly into the bleeding vessel to seal it.
Superselective embolization of the lingual artery has become a preferred approach for controlling massive oral bleeding because it allows the radiologist to identify the exact source of the hemorrhage and shut it down without a neck incision.13Eurasian Journal of Emergency Medicine. Bilateral Lingual Artery Embolization to Control Massive Oral Bleeding That Leads to Cardiac Arrest A dedicated study of cyanoacrylate glue embolization for oropharyngeal hemorrhage in head and neck cancer patients reported a 100% technical success rate with no tongue tissue death in the embolized territory.14Research Square. Cyanoacrylate embolization of the lingual artery for oropharyngeal hemorrhage in head and neck cancer: a dedicated cohort study The lack of tongue necrosis is reassuring and likely relates, again, to the midline septum dividing the tongue’s blood supply. As long as the contralateral lingual artery remains intact, the embolized side can survive on whatever collateral flow exists.
Pseudoaneurysms
A pseudoaneurysm is a contained rupture of an artery wall. Unlike a true aneurysm, where all layers of the vessel wall balloon outward, a pseudoaneurysm involves a breach through the inner layers with blood held in place only by surrounding tissue. Pseudoaneurysms of the lingual artery are rare but dangerous. They can develop after neck surgery, radiation therapy, infection, or direct trauma, and they tend to present as sudden, massive oral bleeding that can seem to come out of nowhere.15PubMed Central. Pseudoaneurysms of the lingual artery: two case reports and a systematic review
The most common scenario involves a patient who has undergone head and neck cancer treatment. Surgery, radiation, and chemotherapy can all weaken the arterial wall, and weeks or months later the weakened spot gives way. Because the tongue is a confined, muscular space, even a small pseudoaneurysm can compress surrounding tissue or rupture with little warning.16JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH. Lingual Artery Pseudoaneurysm after Total Laryngectomy: A Case Report Treatment usually involves either surgical ligation or catheter-based embolization, depending on the patient’s overall condition and how accessible the lesion is.
Delivering Chemotherapy Directly Through the Lingual Artery
The same anatomy that makes the lingual artery a hazard during surgery also makes it a potential drug-delivery route. Because the artery feeds directly into tongue tissue, threading a catheter into it and infusing chemotherapy allows much higher drug concentrations to reach a tongue tumor than would be possible through a standard IV drip.
One approach involves superselective catheterization through the superficial temporal artery into the lingual artery. A study comparing this technique against conventional intra-arterial infusion found that the superselective method delivered more than twice the platinum concentration to the tumor tissue, with a mean of about 10.5 micrograms per gram of wet tissue versus about 4.3 for the conventional route.17PubMed. New superselective intra-arterial infusion via superficial temporal artery for cancer of the tongue and tumour tissue platinum concentration after carboplatin (CBDCA) infusion
Another technique goes further, using microencapsulated chemotherapy drugs injected into the deep lingual artery so that the capsules lodge in the small terminal branches and release their contents locally over time. In a series of 78 patients with tongue cancer, this deep lingual arterial embolization with microencapsulated carboplatin produced a five-year survival rate of about 89% and a ten-year survival rate of about 53%.18PubMed Central. Deep lingual arterial chemoembolization of tongue carcinoma with microcapsuled anticancer drug These are encouraging numbers, though the technique remains specialized and is not yet standard of care in most cancer centers. The idea is appealing: rather than flooding the entire body with a toxic drug, park it right where the cancer is.
Giant Cell Arteritis and Tongue Necrosis
The lingual artery can also be affected by systemic diseases that target blood vessel walls. Giant cell arteritis is an inflammatory condition of medium and large arteries, most commonly affecting the temporal arteries in the head. It is best known for causing severe headaches and vision loss. But when the inflammation extends to the lingual artery, the consequences can be extreme.
In rare cases, giant cell arteritis has caused bilateral tongue necrosis, where the tissue of the tongue dies because its blood supply is choked off by inflamed, swollen artery walls. One case report described an elderly woman who initially presented with neck swelling and tongue pain that progressed to complete bilateral necrosis and eventual loss of the tongue.19PubMed Central. Tongue necrosis as an initial manifestation of giant cell arteritis: case report and review of the literature This is an exceptionally uncommon presentation, but it underscores the tongue’s vulnerability when both lingual arteries are compromised simultaneously. The midline septum that normally protects each half of the tongue from problems on the other side offers no help when both arteries are inflamed at once.
Blood Flow Changes During Speech and Thermoregulation
The lingual artery does not simply deliver a fixed volume of blood to the tongue and call it a day. Blood flow through it changes dynamically depending on what the tongue is doing. A pilot study using Doppler ultrasound found that blood flow at peak systole increased significantly during speech gestures, meaning the tongue demands more blood when it is working hard to form words.20PubMed. Effects of lingual gestures on blood flow into the tongue: a pilot study This makes intuitive sense. The tongue is one of the most active muscles in the body, and rapid, precise movements require robust blood supply to meet metabolic demand.
In some animals, the lingual artery plays an even more dramatic physiological role. Dogs, which lack sweat glands over most of their bodies, rely on panting to dump excess heat. During panting, lingual blood flow increases sharply. In one study, flow rose from resting levels to an average of about 60 milliliters per minute, reaching nearly 75 milliliters per minute at peak panting rates of around 272 breaths per minute. This increase was driven by a drop in local vascular resistance while blood pressure stayed constant, and it contributed substantially to evaporative heat loss from the tongue’s wet surface.21PubMed. Lingual blood flow and its hypothalamic control in the dog during panting Humans do not thermoregulate this way, but the finding illustrates how the lingual artery can be co-opted for purposes beyond simple nutrition of the tongue tissue. The vessel’s capacity to modulate flow rapidly, expanding and contracting in response to neural signals, is part of what makes the tongue such a versatile organ across species.