| retroinguinal space | A triangular space between the peritoneum and the transversalis fascia, at the lower angle of which is the inguinal ligament; it contains the lower portion of the external iliac artery. Synonym: Bogros' space, spatium retroinguinale. (05 Mar 2000) |
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| retromylohyoid space | The sulcus at the posterior end of the mylohyoid line. (05 Mar 2000) |
| retroperitoneal space | An area occupying the most posterior aspect of the abdominal cavity. It is bounded laterally by the borders of the quadratus lumborum muscles and extends from the diaphragm to the brim of the true pelvis, where it continues as the pelvic extraperitoneal space. (12 Dec 1998) |
| 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) |
| 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) |
| 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) |