Chapter 2. Prehension

372 Appendices
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thumb
.....
I. S.
Distal extended two Distal grasp
..... .... / ,> ........ .,
I Internal precision;
External precis In.
:(directional grasp): : (writinggrip) 1
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Figure B.l. Summary of postures identified by various researchers. Postures
are grouped by oppositions. For palm opposition, there are four basic ways to
hold the object against the palm with the fingers. For pad opposition, there
are eight basic ways to use the fingers and thumb to hold and manipulate an
object. For side oppositions, there are two basic ways to hold an object
laterally. Note that some postures (e.g., power grasp, internal precision, etc.)
are combinations of basic postures. These combined grasps are not labelled
with a letter.
statically affixing the object in the hand. A bridge, or link, between
these two poles is the lateral pinch (letter F in Table B.l and Figure