| ossific centre | The site of earliest bone formation via accumulation of osteoblasts within connective tissue (membranous ossification) or of earliest destruction of cartilage prior to onset of ossification (endochondral ossification). Synonym: punctum ossificationis, ossific centre, point of ossification. (05 Mar 2000) |
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| epiotic centre | The centre of ossification of the petrous part of the temporal bone that appears posterior to the posterior saemicircular canal. (05 Mar 2000) |
| expiratory centre | The region of the medulla oblongata that is electrically active during expiration and where electrical stimulation produces sustained expiration. (05 Mar 2000) |
| Kerckring's centre | An occasional independent ossification centre in the occipital bone; it appears in the posterior margin of the foramen magnum at about the sixteenth week of gestation. Synonym: Kerckring's ossicle. (05 Mar 2000) |
| feeding centre | A region of the lateral zone of the hypothalamus, electrical stimulation of which in the rat elicits uninterrupted eating; destruction of the region causes long-lasting anorexia. (05 Mar 2000) |
| fibrillar centre | <cell biology> Location of the nucleolar ribosomal chromatin at telophase: as the nucleolus becomes active the ribosomal chromatin and associated ribonucleoprotein transcripts compose the more peripherally located dense fibrillar component. (12 Nov 1997) |