Is is true that all hands, forefeet and wings have the relatively same bone structure?

Question

Is this true:

The same bones are in the same relative positions in the hands of primates, other mammals, bird wings, cetacean flippers, pterosaur wings and webbed amphibian legs.

Answer 1

no for example in birds wing all bone is hollow and it is lighter than bone in mammalians  and their joint is  different  

Answer 2

The limbs of mammals are all very similar.  The shapes and arrangements of the bones differ, depending on the limb's function, but there is a homology between them all, indicating common ancestry.

Between mammals and birds, the limbs are considered analogous.  They evolved in parallel, but separately (after our species split from the common ancestor).  Because of this, there are similarities, but not true homology (i.e. a dog's leg and a bat's wing are closer to each other than a bat's wing and a duck's wing).

Answer 3

This is true, and for this reason we call bird's wings, animal arms, fins, etc. homologous structures.  We all have one upper arm (or leg) bone connected to two lower arm/leg bones, connected to wrist/ankle bones, then fingers or toes.  Even though the function of a wing, an arm, or a flipper are different, they all share the same basic architecture.  This homology reflects the evolutionary origin of all animals from a common ancestor.

Answer 4

Yes - this is the pentadactyl limb.

Answer 5

Essentially, yes.  there are minor differences.

This also includes pectoral fins on fish.

Good Design -- if it ain't broke, don' fix it!

Answer 6

Yes.  The embryonic forelimb in all terrestrial vertebrates ends in the same basic structure.  From that configuration, a wide variety of terminal structures emerge.  This basic structure can be traced back to Devonian lobe finned fishes.

Answer 7

This question will without a doubt lead to evolution or creation debates.

That is because every fact of nature will be interpreted with our worldview.

Let me try to put some light on this subject.

Yes, all hands, forefeet, and wings have "relatively" the same bone structure. The answer to that is Yes because the question was so broad that the answer needs to be equally broad.

More specificaly though, there are fundamental similarities between all animal parts and fundamental differences. The similarities would include first that there are 4 limbs on animals. The limbs differ in the way they connect to the body, front to back, and they differ between different animals. I.E. My forelimbs connect to my tophalf differently then a deers forelimbs connect to its front half. Also my top limbs connect differently than do my bottom limbs.

The differences also include the design of the appendage. This will differ as to the intended use. My arms and legs are designed differently for different uses. A dogs legs are more similar in use but still differ because the front and rear legs have different uses in locomotion and in other uses. I.E. digging,swimming, turning, climbing.

I think that the similarity is due to a common designer and I see that in the fact that the more similar the use and function the more similar the design. We would note that most animals for their functional existence need limbs to swing, turn, bend, flex, rotate and othe movements in varying degrees. Even a whale or a bird will need some control as to pitch and flex of its appendage. Whales and birds have 5 digits as well as humans but those digits are used differently, grow differently, (as far as the digit number 1 through 5 and their use and dominance, birds have some digits that are not very pronounced, and these differ from their supposed dino ansestors) I find it facinating that rear limbs and forelimbs  come about from different DNA , but how could random mutations produce nearly the same limbs just with varying degrees of difference. If mutations changed a lizards claws into my fingernails and this was due to random mutations. It's a miracle that my hands and feet ended up with the same structure even though both were independantly accidentally brought about.

I know that this is sorta a rambling answer but I think it covers enough topics to give the answer you were looking for.

1. yes there are similarities

2. the similarities go as deep as you want to see them, with the naked eye they look similar, (to the layman) to the scientist, the anatomy is very different and specialized.

3. Some would say that this is due to common ansestory. (I think this is a gross oversimplification)

4. Some would say that this is due to a common designer. ( I think that this is logical due to the fact that the similarities only exist per common function and differ per different function)

5. You would have to make up your own mind on the origins, but you could be very empirical on the observation, measurement, and classification of the similarities and differences.