Domain: Healthcare — Anthropotomy
Target concept: Morphology and Structure of the Humerus

Video generation prompt: Three adult humeral specimens are placed on the table for observation of their overall morphology, structures of both ends, and major bony landmarks.

Evaluation guide:
(i) Target concept: Static, multi-specimen macroscopic osteological observation of normal adult humeral morphology.
Minimum mechanism: Specimens must be rigid, dry, intact human cadaveric or high-fidelity replica bones placed in stable, unoccluded, anatomically faithful configuration on a fixed plane under static illumination.
(ii)Storyline: [Frame 0] Table surface enters view → [Frames 1–3] Three humeri enter field simultaneously (or are already fully in frame) in side-by-side alignment → [Frames 4–10] Continuous static shot holds all specimens in fixed orientation; viewer observes proximal ends (head, tubercles, sulcus) and distal ends (trochlea, capitulum, epicondyles) without obstruction; viewpoint remains locked, lighting stable, no motion or intervention.

Manual:
Experimental Procedure
1. Place three intact adult humeral specimens side-by-side on a neutral flat table.
2. Orient each so proximal end (head + tubercles) faces left, distal end (condyles) faces right.
3. Ensure no overlap and full visibility of both ends and all major bony landmarks.
Observation of Experimental Phenomena
- Proximal end: spherical head, greater/lesser tubercles separated by intertubercular sulcus.
- Distal end: medial trochlea (spool-shaped) and lateral capitulum (rounded), flanked by medial/lateral epicondyles.
- Diaphysis: straight cylindrical shaft connecting ends.
Summary of Experimental Principles
The humerus is a typical long bone with characteristic proximal and distal articular structures and palpable bony landmarks essential for musculoskeletal assessment.

Prompt Grounding rubric:
level_1: No humeral specimens are visible on the table at all; or the objects shown do not look like humerus bones (no long shaft, no rounded head, no condyles); or there is no table surface; or zero specimens are present.
level_2: At least one specimen is recognizable as a humerus (a shaft, a rounded proximal head, and condyles at the distal end), but fewer than three humeri are shown, or a specimen sits on something other than a table (e.g., the floor or someone's hand), or a hand/object blocks a full view of either end of a specimen.
level_3: Three humeral specimens are fully visible on a plain table surface; on each one, both the proximal end (head region) and the distal end (condyle region) are unobstructed and facing the camera.
level_4: All score 3 conditions hold, and the three humeri sit side by side with their shafts running parallel and their proximal ends lined up on the same side, without touching or overlapping one another, and with no tools, labels, or hands anywhere in the shot.
level_5: All score 4 conditions hold, and on every specimen the following landmarks are each clearly distinguishable: the rounded proximal head, the greater and lesser tubercles with the intertubercular sulcus between them, and at the distal end the medial epicondyle, lateral epicondyle, trochlea, and capitulum, all visible from the front or a slight angle without guesswork.

Scientific and Causal Correctness rubric:
level_1: At least one specimen shows a shape that no real humerus has: e.g., the tubercles fused into one lump, no trochlea at all, the head and condyles swapped ends, or proportions like a bird or rodent bone; or the 'bone' looks like glossy plastic, is a uniform unnatural color, or bends like rubber.
level_2: At least one specimen is missing a major feature it should have (no head at the proximal end, or neither epicondyle visible at the distal end), or shows a deformity (heavy bowing, a healed-fracture lump, a tumor-like growth) that a normal adult humerus would not have.
level_3: Every specimen shows the expected adult humerus features: a clear shaft, a rounded proximal head, separate greater and lesser tubercles with the sulcus between them, and at the distal end a spool-shaped medial trochlea next to a rounded lateral capitulum, with nothing contradicting this.
level_4: All score 3 conditions hold, and the landmarks sit in the correct positions relative to each other on every specimen: the greater tubercle is lateral to the lesser tubercle, the trochlea is medial and lower than the capitulum, and the medial epicondyle is more prominent than the lateral epicondyle; none swapped or mirrored.
level_5: All score 4 conditions hold, and on every specimen each landmark keeps a natural, life-like contour: the head is smoothly rounded, the trochlea shows its groove, the capitulum is dome-shaped, and the epicondyles flare out as real bone would, with no landmark smoothed away or simplified into a featureless bump.

Spatiotemporal Consistency rubric:
level_1: A specimen's position or orientation changes abruptly between frames with no motion shown, or a specimen vanishes and comes back, or part of a specimen (e.g., a condyle) appears fragmented in one frame and whole in the next.
level_2: The three specimens stay in place, but the picture is visibly unstable: persistent shake, warping of the bone outlines, or a lighting shift that makes a landmark (e.g., the intertubercular sulcus) disappear into shadow for several consecutive frames.
level_3: All three specimens stay visible and motionless in the same spot on the table for the whole video; nothing teleports, flickers, or breaks apart; the lighting stays bright enough that both ends and all landmarks of every specimen stay visible throughout.
level_4: All score 3 conditions hold, and the camera itself never pans, tilts, or zooms; no specimen changes size relative to another; nothing (hand, shadow, or frame edge) sweeps across a specimen to block its landmarks.
level_5: All score 4 conditions hold, and the three specimens keep the exact same spacing and parallel side-by-side arrangement in every frame with no drift in their position or angle relative to one another, and none of the bones appears stretched, squashed, or otherwise distorted by perspective.