Rare diseases · Sign or symptom
Abnormal 1st metacarpal morphology
Abnormality of the 1st long bone of hand
HP:0010009
What it means
A structural anomaly of the first metacarpal.
In contrast to the metacarpals 2-5, the first metacarpal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the digits 2-5, whereas the proximal phalanx of the thumb is equivalent to the middle phalanges of the other digits.
Part of the broader category
Also called: Abnormality of the 1st metacarpal
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.