Microscopic anatomy of the thin‐walled vessels leaving the heart of the lobster<i>Homarus americanus</i>: anterior median artery
Bibliographic record
Abstract
Abstract.The anterior median artery is an unpaired vessel that leaves the anterior end of the lobster (Homarus americanus) heart and supplies hemolymph to the brain, the antennae, and the eyestalks. This vessel has a trilaminar organization, consisting of a tunica interna with elastic fibrils, a tunica intermedia represented by a bilayered cell mass, and a tunica externa with collagen fibrils. The exposed ends of the medial cells in the tunica intermedia exhibit small, diffuse bundles of microfilaments that are penetrated by microtubules. These bundles have a circumferential or a slightly oblique orientation relative to the lumen of the vessel. The precise role of the microfilaments is unresolved. If the irregularly shaped bundles are static structures, they might contribute to the non‐linear elasticity of the artery. Alternatively, if they generate force, a coordinated contraction of the medial cells might reduce the luminal diameter of the artery and, thus, retard hemolymph flow. Microfilaments of the medial cells anchor to subplasmalemmal filamentous mats, some of which are integral to intermediate junctions and some of which are associated with unbounded cell membranes (hemi‐intermediate junctions). Contraction of the microfilament‐bearing cells would have to occur without the benefit of nervous innervation or the participation of communicating (gap) junctions. If cell contractility is confirmed, a reclassification of the anterior median artery, from capacitance vessel to resistance vessel, is in order, and the bilayered cell mass in the tunica intermedia would likely qualify as the first unstriated muscle found in crustaceans.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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".