Arches and Grips Flashcards
Power
- Use of full hand
- Flexion at all finger jts
- thumb can stabilise object against palm/fingers
Stages:
- Opening hand-ext
- Positioning fingers- e.g. abd
- Bringing fingers to object- shoulder/elbow
- Maintaining static phase- flex.
Precision
-e.g. writing, sewing
- Use of finger and thumb
- Involves skilful placement of object between thumb and fingers
- Palm not involved
- Not as powerful
Stages: 1. Opening hand-ext 2. Positioning fingers- more thumb/forefinger 3. Bringing fingers to object (No static phase)
Cylindrical
- power
- e.g. holding pipe
Use of flexors to carry with fingers wrapped around object
Uses:
- FDP
- FDS
- palmar int (add)
- themar muscles
- hypothemar muscles
-potentially ECU/R and brachioradialis too
Spherical
- power
- e.g. holding orange
Greater spread of fingers to grasp object
More dorsal interosseous activity than cylindrical as fingers abduct to grip around object
-main movement=abduction
Hook
- power
- e.g carrying briefcase
Primarily involves finger
Uses:
- FDP
- FDS
Pad to Pad
- precision
- e.g. squeezing peg
Opposition of pad of thumb to pad of finger
- 80% of all precision handling
- MCP/PIP flexion
- DIP ext/ slight flex
Uses:
- opponens pollicis
- FPL/B
- FD
- lumbricals
- interossei
Tip to Tip
- precision
- e.g. writing (holding pen)
Requires more IP flex than pad to pad
Interosseous of 1stDorsal and 1stPalmar
Pad to Side
- precision
- e.g. key grip
Thumb more add
More AP/FPB activity
-least precise of precision grips
Lateral Prehension
- precision
- e.g. holding between fingers
Between two adjacent fingers
Uses:
- ED
- lumbricals
- 2nd palmar
- 2nd dorsal
Arches
Prox Tranverse- concavity formed by carpals
Distal transverse- MC heads
Longitudinal- MT to distal phalanx
- trans and long tend to be deepened by activity by flexors/opponens muscles and reduced by extensors
Oblique- formed during opposition
-contribute to hand function and gripping
