| posterior region of forearm | The area between the radial and ulnar borders of the forearm posteriorly. Synonym: regio antebrachialis posterior, facies antebrachialis posterior, posterior antebrachial region, posterior surface of forearm. (05 Mar 2000) |
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| posterior region of leg | The back of the leg. Synonym: regio cruralis posterior, posterior crural region, posterior surface of leg. (05 Mar 2000) |
| posterior region of neck | The back of neck, including the suboccipital region. Synonym: regio nuchalis, nuchal region, posterior neck region, regio cervicalis posterior. (05 Mar 2000) |
| posterior region of thigh | The back of the thigh. Synonym: facies femoralis posterior, posterior surface of thigh, regio femoralis posterior. (05 Mar 2000) |
| preoptic region | The most anterior part of the hypothalamus surrounding the anterior or preoptic part of the third ventricle and including the lamina terminalis; containing the lateral and medial preoptic nucleus continuous caudally with, respectively, the lateral and anterior hypothalamic nucleus; rostrally the preoptic region is continuous with the precommissural septum, laterally with the innominate substance. Synonym: preoptic area. (05 Mar 2000) |
| presternal region | The part of the chest over the sternum. Synonym: regio presternalis. (05 Mar 2000) |
| presumptive region | In experimental embryology, an area of the blastula from which a specific tissue or organ may be expected to develop. (05 Mar 2000) |
| pretectal region | A narrow, transversally oriented rostral zone of the mesencephalic tectum, bounded caudally by the superior colliculus, rostrally by the habenular trigone, and laterally by the pulvinar thalami; the area contains several nuclei that receive fibres from the optic tract; it has bilateral efferent connections with the Edinger-Westphal nucleus of the oculomotor nuclear complex by way of which it mediates the pupillary light reflex. Synonym: pretectal region, pretectum. (05 Mar 2000) |
| sacral region | The area of the back overlying the sacrum. Synonym: regio sacralis. (05 Mar 2000) |
| scapular region | The area of the back corresponding to the outlines of the scapula. Synonym: regio scapularis. (05 Mar 2000) |
| hinge region | <immunology, molecular biology> Flexible region of a polypeptide chain for example: as in immunoglobulins between Fab and Fc regions and in myosin the S2 portion of heavy meromyosin. (18 Nov 1997) |
| second-stability region | <radiobiology> A high pressure region where the plasma becomes stable to the pressure-gradient-driven ballooning instability. The plasma is stable in the limit of small pressure gradients, becomes unstable at some intermediate pressure, and then becomes stable again at still higher pressures. Tokamaks operating in the second-stability region would be more attractive because the higher pressures (beta) would provide more fusion reactivity per unit volume of plasma, allowing smaller reactors to be built. (09 Oct 1997) |
| pubic region | The lower central region of the abdomen below the umbilical region. Synonym: hypogastrium, regio pubica. (05 Mar 2000) |
| homogeneously staining region | <molecular biology> A region on a chromosome which, when stained, is uniform in appearance. (Normally, a stained chromosome shows a banding pattern.) Homogeneously staining regions contain multiple copies of a single gene. (09 Oct 1997) |
| Shine Dalgarno region | A poly purine sequence found in bacterial mRNA about 7 nucleotides in front of the initiation codon, AUG. The complete sequence is 5' AGGAGG 3' and almost all messengers contain at least half of this sequence. It is complementary to a highly conserved sequence at the 3' end of 16s ribosomal RNA, 3' UCCUCC 5' and it is thought to be involved in the binding of the mRNA to the ribosome. (18 Nov 1997) |