| limb bud | The limbs of vertebrates start as outpushings of mesenchyme surrounded by a simple epithelium. The distal region is referred to as the progress zone. There has been extensive study of positional information within the limb bud that determines, for example: the proximal distal pattern of bone development and the anterior posterior specification of digits. (18 Nov 1997) |
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| liver bud | The primordial cellular diverticulum of the embryonic foregut endoderm that gives rise to the parenchyma of the liver. (05 Mar 2000) |
| lung bud | The endodermal lung primordium which will give rise to the epithelial lining of the respiratory tract. Synonym: lung bud. (05 Mar 2000) |