| C region | <immunology> The parts of the heavy or light chains of immunoglobulin molecules that are of constant sequence, in contrast to variable or V regions. The constancy of sequence is relative because there are several constant region genes and alleles thereof (see allotypes), but within one animal homozygous at the light and heavy chain constant region genes all immunoglobulin molecules of any one class have constant sequences in their C regions. The constant region sequences for the various different types of immunoglobulin for example IgG, IgA, etc. Will vary. (18 Nov 1997) |
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| posterior antebrachial region | 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) |
| posterior brachial region | The back of arm. Synonym: facies brachialis posterior, regio brachialis posterior, posterior brachial region, posterior surface of arm. (05 Mar 2000) |
| posterior carpal region | The posterior part of the wrist. Synonym: regio carpalis posterior. (05 Mar 2000) |
| posterior crural region | The back of the leg. Synonym: regio cruralis posterior, posterior crural region, posterior surface of leg. (05 Mar 2000) |
| posterior cubital region | The back of the elbow. Synonym: facies cubitalis posterior, regio cubitalis posterior, posterior cubital region, posterior surface of elbow. (05 Mar 2000) |
| posterior knee region | The posterior region of the knee, including the popliteal fossa. Synonym: regio genus posterior. (05 Mar 2000) |
| posterior neck region | 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 arm | The back of arm. Synonym: facies brachialis posterior, regio brachialis posterior, posterior brachial region, posterior surface of arm. (05 Mar 2000) |
| posterior region of elbow | The back of the elbow. Synonym: facies cubitalis posterior, regio cubitalis posterior, posterior cubital region, posterior surface of elbow. (05 Mar 2000) |
| 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) |
| 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) |