noun
ape hand; simian hand
Medical term for a deformity where the thumb is permanently extended and cannot oppose the fingers, resembling a monkey's hand. Often caused by median nerve palsy.
正中神経麻痺により猿手を呈することがある。
Median nerve palsy can result in an ape hand deformity.
猿手では母指の対立運動が障害される。
In ape hand, opposition of the thumb is impaired.
Compound of 猿 (さる, 'monkey') and 手 (て, 'hand'), directly describing the hand's resemblance to a monkey's hand.