| retropharyngeal space | That part of the peripharyngeal spatium located posterior to the pharynx. In the normal adult it measures 4 mm (at C3 level), but is considered abnormal when greater than 7 mm. Can be icreased with a cervical spine fracture, retropharyngeal abscess. Synonym: spatium retropharyngeum, postpharyngeal space. (21 Jun 2000) |
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| retropubic space | The area of loose connective tissue between the bladder with its related fascia and the pubis and anterior abdominal wall. Synonym: spatium retropubicum, cavum retzii, Retzius' cavity, Retzius' space. (05 Mar 2000) |
| retrosternal space | On lateral chest radiographs, the region dorsal to the sternum and ventral to the ascending aorta. Synonym: anterior clear space. (05 Mar 2000) |
| Retzius' space | The area of loose connective tissue between the bladder with its related fascia and the pubis and anterior abdominal wall. Synonym: spatium retropubicum, cavum retzii, Retzius' cavity, Retzius' space. (05 Mar 2000) |
| perforated space | See: anterior perforated substance, posterior perforated substance. (05 Mar 2000) |
| Chassaignac's space | Potential space between the pectoralis major and the mammary gland. (05 Mar 2000) |
| perichoroidal space | The interval between the choroid and the sclera filled by the loose meshes of the lamina fusca of sclera and the suprachoroid lamina. Synonym: spatium perichoroideale, perichoroid space. (05 Mar 2000) |
| perichoroid space | The interval between the choroid and the sclera filled by the loose meshes of the lamina fusca of sclera and the suprachoroid lamina. Synonym: spatium perichoroideale, perichoroid space. (05 Mar 2000) |
| perilymphatic space | Space between the bony and membranous portions of the labyrinth. Synonym: spatium perilymphaticum, cisterna perilymphatica. (05 Mar 2000) |
| perinuclear space | <cell biology> Gap 10-40 nm wide separating the two membranes of the nuclear envelope. (18 Nov 1997) |
| peripharyngeal space | The space, filled with loose areolar tissue, around the pharynx; it is divided into two portions, lateral pharyngeal spatium and retropharyngeal spatium. Synonym: spatium peripharyngeum. (05 Mar 2000) |
| periplasmic space | Structureless region between the plasma membrane and the cell wall of gram-negative bacteria. (18 Nov 1997) |
| periportal space of Mall | A tissue space between the limiting lamina and the portal canal in the liver. (05 Mar 2000) |
| perisinusoidal space | The potential extravascular space between the liver sinusoids and liver parenchymal cells. Synonym: Disse's space. (05 Mar 2000) |
| perivitelline space | The space between the vitelline membrane and the zona pellucida, appearing in an ovum immediately following fertilization. (05 Mar 2000) |