has part has part characteristic of inheres in has modifier Single transverse palmar crease Simian line Single transverse palmar creases Single palmar crease HP:0000954 HP:0006214 Transverse palmar crease The presence of a single palmar crease (instead of the two palmar creases that are typically present). Simian crease Single flexion crease UMLS:C0424731 Single palmar creases Simian creases The distal and proximal transverse palmar creases are merged into a single transverse palmar crease. SNOMEDCT_US:248409006 Abnormality of the palmar creases abnormal decreased amount palmar skin crease