K12 Limbs: Difference between revisions

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The arms begin to develop before the legs. If you look at the whole embryo the legs always look younger (less developed) than the arms (almost a stage behind, about 2 days difference).
The arms begin to develop before the legs. If you look at the whole embryo the legs always look younger (less developed) than the arms (almost a stage behind, about 2 days difference).
The same upper before lower is seen in the mouse and other species.
[[File:Mouse limb skeleton cartoon.jpg|600px]]


Look above at the pictures and see what changes you can see in the shape, features and position of the arm and leg.  
Look above at the pictures and see what changes you can see in the shape, features and position of the arm and leg.  

Revision as of 15:09, 12 September 2016

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Limbs - Arms and Legs

Appendicular skeleton

The arms and legs (we call them "limbs") begin as small buds on the sides of the embryo body.

Stage20-23 limbs a.jpg

Human Limb Development during week 8

From week 5 to week 8 of development, changes occur in the shape and structure of the embryo limbs.

The arms begin to develop before the legs. If you look at the whole embryo the legs always look younger (less developed) than the arms (almost a stage behind, about 2 days difference).

The same upper before lower is seen in the mouse and other species.

Mouse limb skeleton cartoon.jpg

Look above at the pictures and see what changes you can see in the shape, features and position of the arm and leg.

Towards the end of this time (9 weeks) the embryo will also begin to move the arms and legs.


K12 Links: Start Here | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 to 8 | Arms and Legs | Heart | Fetus | Brain Growth | Eyes and Ears | Animal Development Times | Humans and Animal Embryology | Comparative Embryology | Thalidomide

Words Used

arm - the upper limb or in animals the forelimb. (In anatomy, this is only the part between shoulder and elbow)

digit - word used to describe either the finger or toe.

leg - the upper limb or in animals the hindlimb. (In anatomy, this is only the part between hip and knee)

limb - word used to describe either the arm or leg.

limb bud - the first time you can see on the embryo surface where the arm or leg will form. It looks like a "bud" or "paddle" without any features.


Different Species Limbs

Limb comparison cartoon

This cartoon shows the comparative anatomy of bones within the upper limb of 4 different species.


Cite this page: Hill, M.A. (2024, March 29) Embryology K12 Limbs. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/K12_Limbs

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G