Sushruta Samhita, Sharira 5.33
Nabhi sarvanadinam moola — The navel is the root of all Nadi (channels). From the Nabhi, the 72,000 Nadi of the body radiate outward. It is therefore simultaneously the most important therapeutic Marma and one of the most dangerous — injury to Nabhi disrupts the entire channel system simultaneously.

Trunk Marma documentation

MarmaLocationCategorySignificance
HridayaCentre of chest — cardiac regionSadyah PranaharaSeat of Ojas. Injury is immediately fatal. The most important Marma in the trunk — governing Prana, consciousness, and the root of Rasavaha Srotas.
StanamulaBase of each breast (bilateral)Sadyah PranaharaGoverns Stanya (breast milk) channels and the cardiac-respiratory junction.
StanarohitaUpper chest, above Stanamula (bilateral)Kalantara PranaharaUpper respiratory-cardiac junction.
ApastambhaBilateral chest, flanking HridayaKalantara PranaharaGoverns Pranavaha Srotas laterally.
NabhiNavelSadyah PranaharaThe seat of Samana Vata and the convergence of all 72,000 classical channels (Nadi). The umbilicus is documented as the primary Marma for digestive and systemic assessment. Injury produces death through the central nerve-Vata disruption.
BastiSuprapubic — urinary bladder regionVaikalyakaraGoverns Mutravaha Srotas. Injury produces urinary dysfunction.
GudaAnal regionVaikalyakaraGoverns Purishavaha Srotas and Apana Vata. The seat of the primary downward Vata force.
KatikatarunaPosterior iliac spine (bilateral)VaikalyakaraThe lumbosacral junction — governs lower limb innervation and the pelvic channel.
KukundaraBilateral gluteal — sacroiliac regionVaikalyakaraGoverns hip joint function and the descending Vata channels.
NitambaUpper gluteal (bilateral)VaikalyakaraHip joint connection.
ParshvasandhiLateral thorax — axillary line (bilateral)VaikalyakaraThe lateral thoracic junction — governs the lateral channel flow.
VrihatiPosterior thorax, bilateral paraspinalVaikalyakaraPosterior respiratory channels.
Nabhi as the therapeutic centre
The Nabhi Marma is the most therapeutically targeted trunk Marma in classical Ayurveda. Nabhi Basti (warm oil pooled in a dough ring on the navel) is a classical procedure for digestive conditions, lower back pain, and Vata disorders — the oil's warmth and pharmacological compounds act directly through the Nabhi Marma on the concentrated channel junctions it governs. The procedure is documented in Ashtanga Hridayam's Bahya Snehana section.