The Natural History of Pediatric Trigger Thumb in the United States
: While early hominins showed signs of dexterity, research suggests the powerful, efficient thumb seen in modern humans emerged about 2 million years ago, likely fueling the development of complex tool-making cultures. mature natural thumbs
: The thumb is typically the last digit to form during embryonic development. It begins as a limb bud around Day 28 and reaches interdigital differentiation by Day 44. The Natural History of Pediatric Trigger Thumb in
Abstract