Spine-axis base
Lower ascent threshold
This lower midline point begins the drawn spine axis above the seated base and gives the ascent a visible bodily threshold. Seiðr sources do not describe a spinal channel, so this point and its coordinate are a transparent modern synthesis of trance travel and posture evidence.
Point 4 of 8 in Seiðr Norse Trance — body projection
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Poetic Edda (primary_canonical)
Vǫluspá sts. 22 and 28–29 provide the principal Eddic vocabulary of the vǫlva, seiðr, prophecy, and visionary questioning. They establish the poem's trance-and-prophecy register, not a literal spinal channel or lower-axis point.
Neil Price, The Viking Way: Magic and Mind in Late Iron Age Scandinavia (scholarly_modern)