Evidence for a metameric pattern in the development of the chick humerus.

Evidence for a metameric pattern in the development of the chick humerus.

Journal of embryology and experimental morphology (1981-02-01)

T D Stephens, T R McNulty

ABSTRACT

It has been proposed that the wing bud is induced by some axial influence at a specific confined location and that the ZPA is the residual influence of such induction. The purpose of the present investigation was to test this hypothesis. Tantalum foil barriers were placed lateral to the mesonephric duct and parallel to the long axis of the embryo in the wing field of stage-12 to -15 chick embryos. These barriers blocked the somatopleure's communication with more medial tissues at specific somitic levels. The results of these experiments demonstrate that (1) the limb is not induced at one specific point, (2) portions of the humerus appear to be induced segmentally along the entire limb field and (3) the ZPA is not induced by axial structures. We propose a model of wing development suggesting that the humerus is induced as several separate components which then fuse to form the definitive bone.

MATERIALS

Product Number

Brand

Product Description

GF23883576

Tantalum, foil, 1m coil, thickness 0.1mm, coil width .62mm, as rolled, 99.9%

GF42443984

Tantalum, foil, not light tested, 100x100mm, thickness 0.01mm, 99.9%

GF11923589

Tantalum, foil, light tested, 25x25mm, thickness 0.006mm, 99.9%

GF19254472

Tantalum, foil, not light tested, 25x25mm, thickness 0.0005mm, 99.9%

GF63410048

Tantalum, foil, light tested, 50x50mm, thickness 0.0075mm, 99.9%

GF01901539

Tantalum, foil, not light tested, 50x50mm, thickness 0.002mm, 99.9%

GF83507238

Tantalum, foil, light tested, 100x100mm, thickness 0.03mm, as rolled, 99.9%

GF42889517

Tantalum, foil, light tested, 150x300mm, thickness 0.075mm, annealed, 99.9%

GF15731186

Tantalum, foil, light tested, 25x25mm, thickness 0.01mm, 99.9%

GF15979494

Tantalum, foil, light tested, 50x50mm, thickness 0.075mm, annealed, 99.9%

GF52742099

Tantalum, foil, light tested, 100x100mm, thickness 0.034mm, as rolled, 99.9%

GF65369324

Tantalum, foil, light tested, 100x100mm, thickness 0.05mm, annealed, 99.9%

GF48352798

Tantalum, foil, light tested, 50x50mm, thickness 0.006mm, 99.9%

GF00815958

Tantalum, foil, not light tested, 25x25mm, thickness 0.001mm, 99.9%

GF53850371

Tantalum, foil, light tested, 25x25mm, thickness 0.003mm, 99.9%

GF64866202

Tantalum, foil, not light tested, 82x100mm, thickness 0.006mm, 99.9%

GF84327510

Tantalum, foil, not light tested, 25x25mm, thickness 0.01mm, 99.9%

GF69076839

Tantalum, foil, light tested, 50x50mm, thickness 0.034mm, as rolled, 99.9%

GF93289090

Tantalum, foil, light tested, 25x25mm, thickness 0.004mm, 99.9%

GF15129817

Tantalum, foil, not light tested, 50x50mm, thickness 0.01mm, 99.9%

GF90076989

Tantalum, foil, not light tested, 50x50mm, thickness 0.0015mm, 99.9%

GF12486618

Tantalum, foil, 8mm disks, thickness 0.02mm, 99.9%

GF24472616

Tantalum, foil, 50mm disks, thickness 0.075mm, annealed, 99.9%

GF87367405

Tantalum, foil, 4mm disks, thickness 0.75mm, annealed, 99.9%

GF72426821

Tantalum, foil, 6mm disks, thickness 0.015mm, 99.9%

GF38684964

Tantalum, foil, 8mm disks, thickness 0.25mm, annealed, 99.99%

GF35633785

Tantalum, foil, light tested, 25x25mm, thickness 0.015mm, 99.9%

GF42457686

Tantalum, foil, 5m coil, thickness 0.025mm, coil width 0.75mm, annealed, 99.9%

GF66499891

Tantalum, foil, 6mm disks, thickness 0.02mm, 99.9%

GF15417154

Tantalum, foil, not light tested, 25x25mm, thickness 0.003mm, 99.9%