RobStC
A-List Customer
- Messages
- 371
- Location
- Edinburgh, Scotland
KILO NOVEMBER said:If you start counting where the digit connects to the hand, every finger BUT the thumb has two additional joints. Thumbs only have one, that's what makes them special. I can imagine the first knuckle (where the thumb attaches to the hand) and the second knuckle (the only other joint on the thumb), but I am mystified as to the location of the third one.
Could you clarify?
Presumably a reference to the joint between the metacarpal bone on the thumb side of the hand (which often moves as the 'thumb' is articulated) and the carpals at the wrist. So not technically a phalanx of the thumb at all , but certainly part of the functional articulation of the thumb side of the hand.....
A bit like the clavicle not usually being included as part of the arm (conventionally seen as starting at the gleno-humeral joint), but the clavicle clearly forming part of the articulation system for movement of the upper limb in certain directions of movement.
Clear as mud??
RobStC
(And don't let's start discussing in any detail whether the hyoid is actually a bone or just a lump of gristle that acts like a bone , otherwise we'll be here all day!!!)