Table 1 Grasp types and sizes
From: Cognitive vision system for control of dexterous prosthetic hands: Experimental evaluation
Type of opposition | Grasp type and aperture size | Grasp ID |
|---|---|---|
Palm opposition | ||
All palmar surfaces of the fingers and the palm are involved and the thumb is in opposition to other fingers (as in grasping a bottle). | Palmar Large | PL |
Palmar Medium | PM | |
Palmar Small | PS | |
Side opposition | ||
The thumb opposes the radial aspect of the index finger (as in grasping a key). | Lateral Large | LL |
Lateral Medium | LM | |
Lateral Small | LS | |
Pad opposition | ||
The opposition is formed between the fingertips of the thumb and the fingers (as in lifting a pin from a flat surface). | 3-digit Medium (index, middle finger and thumb) | TM |
3-digit Small | TS | |
2-digit (index finger and thumb) | B |