File:Haines1947 fig03.jpg

Fig. 3. 10.5 mm 5.5 weeks embryo Hind-limb

10.5 mm Smout’s 5.5 weeks embryo, 16.1.4. Hind-limb

The skeletal blastema of the femoral (fm.), tibial (tb.) and foot-plate (f.p.) regions are distinguishable. The pre-muscle masses of the thigh (p.m.) are more condensed than the general mesenchyme, but those for the more distal part of the limbs have not yet appeared.

At 10 mm just before the first chondrifications become recognizable, the skeletal blastema is more clearly marked off from the surrounding tissues, but is still continuous in some places with the pre-muscle masses. The blastema of the upper arm is marked off from the extensor mass, but between it and the median nerve there is as yet no sign of differentiation of the intervening condensed mesenchyme. The blastema as a whole has the general form of the future skeleton (as shown in Lewis’s and Bardeen’s reconstructions), but though the general positions where the scapula and the long bones will appear later can already be distinguished, there is no sign of any morphological differentiation at these sites. The hind-limb of this embryo shows a similar structure, but the tissues are less well differentiated.

Reference

Haines RW. The development of joints. (1947) J. Anat. 81, 33-55.

Cite this page: Hill, M.A. (2024, April 24) Embryology Haines1947 fig03.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Haines1947_fig03.jpg

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