Evolution of human hand by Rajesh

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Evolution of human’s hand regarding it’s external surface & anatomical explanation of bone’s..:

By:- Rajesh kumar hemathkar mohan kumar.. From:- University of Geomedi. Evolution of human’s hand regarding it’s external surface & anatomical explanation of bone’s ..

Content’s.:

This all stages will appear next of Homo erectus. Stone sage in human’s evolution start’s from homo ergaster stage , where human’s start’s to use stone’s in there daily life style to make there daily progress more active.. Homo ergaster. Homo antecessor. Homo rhodesiensis. Homo sapiens. Content’s.

1.Homo ergaster.:

This stage appear b/w 1.8 – 1.2 MYA. Short thumb finger. Large palm. We find long metacarpal’s bone. But very sort phalanges, especially thumb. 1.Homo ergaster.

2.Homo antecessor.:

This stage appear b/w 1.2 MYA – 0.8 KYA. Compare to ergaster, Length of index, middle, ring, & pinky finger increase’s. Surface area of palm decreases. Most considerable thing is length of thumb increase’s. Length of 3 rd horizontal line on palm reduces. 2.Homo antecessor.

Slide5:

Length of metacarpal’s reduces compare to privies stage. Length of phalanges especially thumb increases.

3.Hemo rhodesiensis.:

This stage appear b/w 300 – 120 KYA. Surface area of palm decreases in large scale compere to previse stage. Thumb length slightly increase’s. But length of index, middle, ring, pinky finger decreases. 3.Hemo rhodesiensis.

Slide7:

Length of metacarpal’s reduces compare to privies stage. Length of phalanges reduces except thumb increases.

4.Homo sapiens (modern human).:

4.Homo sapiens (modern human). This stage started at 40 KYA & right now also it’s going on. Surface area of palm decreases. We see decrease in the length of index, middle. Ring. Pinky finger. Length of thumb increases.

Slide9:

Length of metacarpal’s reduces compare to privies stage. Length of phalanges reduces except thumb (increases). & we know that modern human hand consists of totally 27 bones (carpal's – 12, metacarpal’s – 5, phalanges – 14)

This picture tell’s what is advantage of modern human hand’s compared to old chimpanzee hand’s..:

This picture tell’s what is advantage of modern human hand’s compared to old chimpanzee hand’s..

All this information collected from ,, & article name “Homo sapiens” written by  Emma Groeneveld..:

Thank’s for you’r attention.. All this information collected from ,, & article name “Homo sapiens” written by   Emma Groeneveld..

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