Human Hand with opposable Thumb
Modern human thumb and index finger (right hand) during pad-to-pad precision grasping in ulnar view.
The box shows the anatomy of the pollical distal phalanx and its relationship with soft structures related to refined manipulation: a huge proximopalmar fossa (orange), associated with a palmarly protruding ridge (red) for insertion of the flexor pollicis longus; a compartmentalized digital pulp to accommodate the shape of the object being manipulated; this is reflected in the presence of an ungual fossa (green), associated to the large and mobile proximal pulp, as well as a wide apical tuberosity associated with the smaller and less mobile distal pulp; and finally, the ungual spines (yellow), where the collateral intraosseous ligaments that sustain the nail bed insert.
Source:
Almécija S, Moyà-Solà S, Alba DM (2010) Early Origin for Human-Like Precision Grasping: A Comparative Study of Pollical Distal Phalanges in Fossil Hominins. PLoS ONE 5(7): e11727. doi:10.1371/journal.pone.0011727
Bonobo at the San Diego Zoo "fishing" for termites.
A bonobo "fishing" for termites, an example of incomplete/"untrue" opposition.
Opposable thumb on rear foot of a Virginia Opossum.
http://animaldetector.blogspot.com/
Date 9/15/08
Modern human thumb and index finger (right hand) during pad-to-pad precision grasping in ulnar view.
The box shows the anatomy of the pollical distal phalanx and its relationship with soft structures related to refined manipulation: a huge proximopalmar fossa (orange), associated with a palmarly protruding ridge (red) for insertion of the flexor pollicis longus; a compartmentalized digital pulp to accommodate the shape of the object being manipulated; this is reflected in the presence of an ungual fossa (green), associated to the large and mobile proximal pulp, as well as a wide apical tuberosity associated with the smaller and less mobile distal pulp; and finally, the ungual spines (yellow), where the collateral intraosseous ligaments that sustain the nail bed insert.
Source:
Almécija S, Moyà-Solà S, Alba DM (2010) Early Origin for Human-Like Precision Grasping: A Comparative Study of Pollical Distal Phalanges in Fossil Hominins. PLoS ONE 5(7): e11727. doi:10.1371/journal.pone.0011727
A bonobo "fishing" for termites, an example of incomplete/"untrue" opposition.
http://animaldetector.blogspot.com/
Date 9/15/08
No comments:
Post a Comment