The Volar Base of the Third Metacarpal Is Not a Palpable Landmark in the Palm
Bibliographic record
Abstract
Various techniques have been described to identify the topographical projection of the thenar branch of the median nerve (TBMN). This study explores two hypotheses: (1) There is a palpable landmark overlying the volar base of the third metacarpal, and (2) this landmark is the transverse carpal ligament, not the third metacarpal base itself. Using four upper extremities from two cadavers, manual palpation was performed to identify and mark the palpable landmark overlying the volar base of the third metacarpal using a radiopaque marker. The distance between the palpable landmark and the volar base of the third metacarpal was measured using fluoroscopy. Anatomic dissection was then performed to identify the basis of the landmark. The palpable landmark was confirmed to be the distal end of the transverse carpal ligament in all specimens. Therefore, there is a palpable landmark beneath the palmar skin overlying the volar base of the third metacarpal, and it is the distal edge of the transverse carpal ligament, not the metacarpal base.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".