Right middle — ether (ākāśa)
Anatomical-right hand
The anatomical-right middle finger is marked as ether or space in the selected hand correspondence. It gives the circuit a containing pole, but the front-view location is an inset projection rather than a textual body coordinate.
Point 3 of 10 in Mudrās — Hand Element Circuits (मुद्रा)
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Vasant Lad, Ayurveda: The Science of Self-Healing (secondary)
Hand-mudrā section, five-element finger correspondence; middle finger is assigned to ether/space in the convention used here.
Kularṇava Tantra (primary)
Chapter 17, mudrā teaching and ritual hand gestures.