| 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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| bones of upper limb | These include the superior limb girdle (scapula and clavicle) and the skeleton of the free superior limb (humerus, radius, ulna, wrist bones, metacarpus, and bones of the fingers). Synonym: ossa membri superioris, bones of superior limb. (05 Mar 2000) |
| regions of upper limb | The topographic divisions of the upper limb: deltoid, arm, elbow, forearm, carpal region, and hand. Synonym: regiones membri superioris, regions of superior limb. (05 Mar 2000) |
| joints of free upper limb | The joints uniting the bones of the free superior limb girdle; they are the shoulder joint, elbow joint, radioulnar joints, and joints of the wrist and hand. Synonym: articulationes membri superioris liberi, joints of free superior limb, juncturae membri superioris liberi. (05 Mar 2000) |
| upper limb | The shoulder, arm, forearm, wrist, and hand. Synonym: membrum superius, superior limb, thoracic limb, upper extremity. (05 Mar 2000) |
| medial nasal primordium | An ectodermally covered mesenchymal swelling lying medial to the olfactory placode or pit in the embryo. Synonym: medial nasal fold, medial nasal primordium, medial nasal process. (05 Mar 2000) |
| primordium | An aggregation of cells in the embryo indicating the first trace of an organ or structure. Synonym: anlage. Origin: L. Origin, fr. Primus, first, + ordior, to begin (05 Mar 2000) |
| lateral nasal primordium | An ectodermally covered mesenchymal swelling separating the embryonic olfactory pit from the developing eye. Synonym: lateral nasal fold, lateral nasal primordium, lateral nasal process. (05 Mar 2000) |
| frontonasal primordium | The unpaired embryonic prominence between the medial nasal elevations, which eventually merges with them to contribute to the bridge of the nose and the underlying nasal septum. Synonym: forebrain eminence, forebrain prominence, frontonasal primordium, frontonasal process. (05 Mar 2000) |
| bronchial bud | One of the outgrowths from the primordial endodermal laryngotracheal tube giving rise to the primary bronchi. See: laryngotracheal diverticulum. (05 Mar 2000) |
| bud | <botany> A small swelling or projection on a plant, from which a shoot, cluster of leaves, or flowers develops, a rudimentary, undeveloped shoot, leaf, or flower. (09 Oct 1997) |
| bud fission | 1. <biology> The formation of a new individual, either animal or vegetable, by a process of budding; an asexual method of reproduction; gemmulation; gemmiparity. See Budding. 2. <botany> The arrangement of buds on the stalk; also, of leaves in the bud. Origin: Cf. F. Gemmation. Source: Websters Dictionary (01 Mar 1998) |
| bud stage | First stage of tooth development; development of the primordia of the enamel organs, the tooth buds. (05 Mar 2000) |
| vascular bud | An endothelial sprout arising from a blood vessel. (05 Mar 2000) |
| mary-bud | <botany> The marigold; a blossom of the marigold. Source: Websters Dictionary (01 Mar 1998) |