Human Phenotype Ontology 
Grandparent Node:
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Abnormal metacarpal morphology (HP:0005916)help
Grandparent Node:
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Synostosis involving bones of the hand (HP:0004278)help
Grandparent Node:
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Synostosis of metacarpals/metatarsals (HP:0100265)help
Parent Node:
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Abnormal 1st metacarpal morphology (HP:0010009)help
Parent Node:
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Metacarpal synostosis (HP:0009701)help
..Starting node
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Synostosis involving the 1st metacarpal (HP:0009703)help
Term ID: 9703
Name: Synostosis involving the 1st metacarpal
Synonym: First metacarpophalangeal joint synostosis; Fusion involving 1st long bone of hand; Symphalangism affecting the 1st metacarpal
Definition: Fusion of the 1st metacarpal with another bone. In contrast to the proximal phalanges of the digits 2 to 5, the proximal phalanx of the thumb is embryologically equivalent to the middle phalanges of the other digits, whereas the first metacarpal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the other digits.
Comments:
Reference: HP:0009703
Genes and Diseases:
 
       Child Nodes:
........expandSynostosis of the proximal phalanx of the thumb with the 1st metatcarpal (HP:0009640) help

 Sister Nodes: 
..expandCarpometacarpal synostosis (HP:0100328) help
..expandMetacarpophalangeal synostosis (HP:0005880) help
..expandSynostosis involving the 2nd metacarpal (HP:0009705) help
..expandSynostosis involving the 3rd metacarpal (HP:0009706) help
..expandSynostosis involving the 4th metacarpal (HP:0009707) help
..expandSynostosis involving the 5th metacarpal (HP:0009708) help


Genes (2) :NONO PQBP1

Diseases (3) :ORPHA:466791 OMIM:300967 OMIM:309500
 

Human Phenotype Ontology(HPO) is developed by the Human Phenotype Ontology Consortium. The version used here is December 15 2022 release.