How to Grow Your Radix: Nasion and Suture Traction

Nasion is a point on bone: midline, where the frontal bone meets the two nasal bones. Radix is what you see around that point, bone plus cartilage plus skin. People mix them up because they sit on top of each other. This area grows when you are a kid. It still moves in adults. The suture there responds to strain. Cyclic force at the same peak grew more bone than a held pull. Stem cells in the suture go osteogenic when you expand it. That is how you work the radix. You do not win by pulling as hard as you can.

Put a finger on the dip between your eyebrows and the start of your nose. Under that skin is nasion, bone on bone, frontal meeting nasal bones. What you see in the mirror is radix: that dip plus the skin and fat over it. Close, not the same thing. Thick skin hides a high bone root. Thin skin shows a low one.

A high radix means the bridge starts up near the brow. A low radix means a deeper step from forehead into nose. Height and projection are different jobs. Two people can start the bridge at the same height and one still sticks farther forward.

The nasofrontal angle is one number for a 3D shape. Move the forehead line, the bridge line, your head pitch, or where you mark nasion, and the number changes. Use it to compare matched photos. Do not treat it as the whole root.

• Bone: nasion at the frontonasal suture.
• What you see: radix around the start of the bridge.
• One number: nasofrontal angle through forehead, nasion, nose.
• Phone trap: a shadow is lighting, not a CT of the suture.

Longitudinal cephalograms show nasion coming forward and down relative to the cranial base while kids grow (PMID 34960576). Follow kids from 6 to 18 and nasal projection increases while the nasolabial angle stays relatively still (PMID 23834271). The root is a growth site. It is not a finished adult part you are not allowed to touch.

3D anthropometry from age 4 to 73 found the nose still gaining volume, surface, and linear size with age (PMID 20729017). CT across African, European, and Arctic groups found a lot of nasal form set early, then sex and age keep editing it (PMID 34549897).

Adults are not frozen. Paired CT in Korean adults about 12 years apart: nasofrontal angle up about 3.2 degrees in men and 2.5 in women, with more profile length and bridge height (PMID 38062715). Periosteum and suture tissue here are still alive. That is the point.

Best head-to-head we have: growing rabbits, same 5 N peak, 10 minutes a day, 12 days. One group held the force. The other ran it at 1 Hz. Cyclic force opened the suture more, packed more cells, and laid more new bone at both the premaxillomaxillary and nasofrontal sutures (PMID 12619937). Same peak. The on-off pattern did the extra work.

They also ran static, sine, and square waves into those sutures. Strain in the tissue followed the wave. Peak strain under static and sine was about the same (PMID 14582615). So the cyclic win was not “more newtons.” It was timing.

Chewing already hits this suture. In miniature swine the nasofrontal suture took real compressive strain during mastication and grew faster than internasal and interfrontal sutures (PMID 10521876). You already load it when you eat. A session is you choosing the direction and the rhythm.

Four-week mice, controlled distraction of the zygomaticomaxillary suture: Gli1-lineage cells divided and sat next to Runx2-positive osteogenic cells. Block Hedgehog and the response dies. In the dish, primary cilia were the force sensors (PMID 38971766).

Single-cell work on mouse expansion: tension pushed suture stem cells off a cartilage path onto a bone path through Dalrd3, m3C, Id3, and BMP (PMID 40528244). Rat expansion tied Piezo1 and CaMKII to Runx2, Osterix, alkaline phosphatase, and remodeling right at the suture (PMID 39350680). Piezo1 is a stretch channel. You stretch the interface, calcium signaling, bone genes.

Closed adult sutures still respond. Expand the sagittal suture in adult mice and a Prrx1 skeletal stem cell pool grows and supports Wnt-linked bone (PMID 37040407). “Closed” means the gap is tight. It does not mean the cells quit.

Human mandibular mesenchymal stromal cells, 10% cyclic strain, 0.5 Hz, 7 or 14 days: osteogenic markers up, mineral up, alkaline phosphatase up (PMID 24804200). Human periodontal ligament stem cells at the same 10% / 0.5 Hz: osteogenic signaling through a microRNA-BMP2-Smad path (PMID 33433643). Human tissue, human cells.

BMP2 and Smad are how a lot of bone programs get written. Cyclic stretch turns that on. A max hold is not the same signal.

Expansion also pulls in blood vessels and immune cells. Mouse midpalate, cyclic tension: endothelial VEGFA and marrow stromal recruitment. Kill neutrophils and new bone volume drops 43.6% in seven days (PMID 38135895). Bone is not one cell type. Cycle the load and endothelium, marrow stroma, and neutrophils all show up.

Suture Traction Therapy is the face work before thumbs go on the palate. The published protocol is cranial suture traction as a planned sequence (PMID 35888588). For radix you want the frontonasal suture: frontal bone on top, nasal bones below, nasion in the joint.

Lie on your back. One hand on the forehead, spread, holding the frontal bone. Both thumbs in the dip where the nasal bones meet the forehead, the nasion/radix recess. Pull like the arrows: a little up into frontal, a little out along the root. One point of force into the periosteum. The periosteum is the living skin of the bone. Trigeminal branches run under that skin. If you crush it you are on a nerve, not on a suture.

Hold 20-30 seconds at about 40-60% of a hard pull. Jaw loose. Nose breathing. Then the same force, load and unload. Then palate. Skip the face work and you just dumped palatal force into a root you never set.

• Lie down. Head supported. Jaw unclenched.
• Hold the frontal bone with a flat hand.
• Thumbs in the nasion/radix dip. Not in the eyes. Not on tip cartilage.
• Force: one point against periosteum. 40-60%. 20-30 second holds.
• Stop if you get sharp pain, numbness, visual change, a click, or a bite that suddenly feels wrong.

A session is minutes. Your tongue is all day. If it sits in the floor of the mouth, the midface has no resting load and the traction session dies the second you stand up. After STT and palatal work: lips closed, nasal breathing, tongue on the hard palate, teeth slightly apart. See myofunctional analysis.

The face is heavily innervated. Trigeminal supplies the periosteum you are pulling. Oral posture is plastic. Maps in the brain update with clean repeats, not with one ugly max effort. Osteoblasts have TrkB. BDNF raises VEGF, migration, and osteogenic programs (PMID 28098876, PMID 32803867). Mild nasal rhythm during cyclic work is enough. You do not need to choke yourself or grind a nerve to “make it work.”

• Tongue–palate suction. Broad suction on the hard palate, back of the tongue up, teeth slightly apart. 15-20 seconds. 5 reps.
• Tongue on a spoon. Press into a spoon, lips closed, no jaw brace. 30 seconds. 2 sets.
• T, then hold. Say a clean T and keep the back of the tongue high 10-15 seconds. 3 sets.
• Nerves. Stay off the supraorbital notch, the eyeball, and nasal tip cartilage. Electric zing means nerve, not suture.
• Dose. Same peak, cycled. More force is not more bone. Pain means stop.

Cyclic force at a matched peak grew more suture bone than a hold (PMID 12619937). Suture progenitors divide and go osteogenic under expansion (PMID 38971766, PMID 37040407). Human cells do the same under cyclic stretch (PMID 24804200, PMID 33433643). So: STT on the frontonasal suture, hold a clean pull, cycle that pull, tongue on the palate.

Force on bone and periosteum you can actually reach. Even contact. Nasal breathing. Months. If it hurts like a nerve or the bite goes weird, you are done for the day.

How I teach palatal work is in what thumbpulling is. Hormones and food are in how to improve facial dimorphism. Other measurements: the measurements series.

Solar takes the profile break at nasion and estimates the nasofrontal angle against the rest of the nose, lips, and chin. A deep root next to a heavy brow is not the same read as a deep root next to a flat forehead.

Use a real side profile. Same distance, same head pitch, same light. Then you can tell if the root moved. Two random selfies are not data.

Camera level. Forehead and chin in frame. Lips and brows relaxed. No wide-angle close-up. Repeat the same setup.

• You get: visible profile and nasofrontal angle.
• You also need: forehead, nose, lips, chin together.
• Garbage: unmatched lens, pitch, or lighting.
• Do this: same camera, same posture, same light every time.

Stand the camera back. Use optical zoom, not a close wide lens. Ear canal to lower orbital rim roughly level. Teeth and lips relaxed. Mark glabella, the deepest visible root, and a stable point on the bridge.

Write more than one number. Nasofrontal angle is the bend. Radix height is where the root starts. Radix projection is how far forward it sits. Dorsal contour is straight, convex, or concave. One angle can move when the root did not.

Water, swelling, brow position, forehead tension, body fat, and lighting all change the shadow at the root. Track months on matched photos. A weekend of different lighting is not growth.

Nasion is bone. Radix is what you see. Both still change after childhood. Cyclic force grows more suture bone than a dead hold at the same peak. The cells in there make bone when you expand the joint. Your cells do the same under cyclic stretch.

Do Suture Traction Therapy, then cyclic palatal work. Read the rest of the measurements. Use Solar on a matched side profile so you are looking at geometry, not a different bathroom light.

Want this measurement read across your own facial structure? Run the Solar facial analysis.