limb bud


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bud

 [bud]
1. a structure on a plant, often round, that encloses an undeveloped flower or leaf.
2. something resembling the bud of a plant, especially a protuberance in the embryo from which an organ or part develops.
end bud the remnant of the embryonic primitive knot, from which arises the caudal part of the trunk.
limb bud one of the four lateral swellings appearing in vertebrate embryos, which develop into the two pairs of limbs.
tail bud
the primordium of the caudal appendage.
taste b's end organs of the gustatory nerve containing the receptor surfaces for the sense of taste.
ureteric bud a dorsal outgrowth of the mesonephric duct near its entry into the cloaca; it is the primordium of the ureter, renal pelvis, calices, and collecting tubules of the kidneys.
bud of urethra bulb of urethra.

limb bud

an ectodermally covered mesenchymal outgrowth on the embryonic flank giving rise to either the forelimb or hindlimb.

limb bud

(lim bŭd)
An ectodermally covered mesenchymal outgrowth from the embryonic trunk giving rise to either the upper limb or lower limb.

bud

a structure resembling the bud of a plant, especially a protuberance in the embryo from which an organ or part develops.

end bud
the remnant of the embryonic primitive knot, from which arises the tail and caudal part of the trunk.
horn bud
bilateral cranial protuberances, destined to develop to a fighting horn or antler stage.
limb bud
one of the four lateral swellings appearing in vertebrate embryos, which develop into the two pairs of limbs.
tail bud
1. the primordium of the caudal appendage.
2. end bud.
taste b's
end organs of the gustatory nerve containing the receptor surfaces for the sense of taste.
ureteric bud
an outgrowth of the mesonephric duct giving rise to all but the nephrons of the permanent kidney.
bud of urethra
bulb of urethra.
References in periodicals archive ?
On the cellular level, the differentiation of limb bud into separate digits occurs via a complicated cascade of molecular signaling and pathways.
For example, in the developing limb bud, tissue regression has been largely associated to the molecular control of self-induced cell death (apoptosis).
The in situ hybridization analysis indicated that the lmbr1 expression levels were coincident with the Q-PCR results in HH21, HH23 and HH24 stages, with the expression sites located in ectoderm of the limb buds.
The resulting blastema, a mass of unspecialized cells, proliferates rapidly to form a limb bud.
Congenital birth defects of the arms, legs, hands or feet result from improper development of limb bud tissues during embryogenesis.
Cell lines with chondrogenic potential, such as C3H10T1/2 cells, and primary limb bud mesenchymal cells plated at high density undergo differentiation to form distinct cartilage nodules.
When the tissue wedge was grafted onto an untreated limb bud, it made the chick grow an extra set of digits.