| 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) |
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| 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) |
| personal space | Invisible boundaries surrounding the individual's body which are maintained in relation to others. (12 Dec 1998) |
| pharyngeal space | The area occupied by the pharynx (naso-, oro-, and laryngopharnynx). Not to be confused with the retropharyngeal space. (05 Mar 2000) |
| pharyngomaxillary space | The space limited by the lateral wall of the pharynx, the cervical vertebrae, and the medial pterygoid muscle. Synonym: parapharyngeal space. (05 Mar 2000) |
| middle palmar space | The more medial of the central palmar spaces, bounded medially by the hypothenar compartment; related distally to the synovial tendon sheaths of digits 3 and 4 and proximally to the common flexor sheath. Synonym: medial midpalmar space, middle palmar space. (05 Mar 2000) |
| midpalmar space | Either of the two central palmar spaces (medial or lateral). (05 Mar 2000) |
| Cloquet's space | A space between the ciliary zonule and the vitreous body. (05 Mar 2000) |
| physiologic dead space | The sum of anatomic and alveolar dead space; the dead space calculated when the carbon dioxide pressure in systemic arterial blood is used instead of that of alveolar gas in Bohr's equation; it is a virtual or apparent volume that takes into account the impairment of gas exchange because of uneven distributions of lung ventilation and perfusion. (05 Mar 2000) |
| Mohrenheim's space | A triangular depression bounded by the clavicle and the adjacent borders of the deltoid and pectoralis major muscles. Synonym: fossa infraclavicularis, deltoideopectoral triangle, deltoideopectoral trigone, infraclavicular triangle, Mohrenheim's fossa, Mohrenheim's space, regio infraclavicularis, trigonum deltoideopectorale. (05 Mar 2000) |
| Waldeyer's space | The tubular space between the bladder wall and the intramural portion of the ureter as it courses obliquely through this structure; actually a space and not a true sheath. Synonym: Waldeyer's space. (05 Mar 2000) |
| Colles' space | The superficial compartment of the perineum; the space bounded above by the perineal membrane (inferior fascia of the urogenital diaphragm) and below by the superficial perineal (Colles') fascia; it contains the root structure of the penis or clitoris and associated musculature, plus the superficial transverse perineal muscle and, in the female only, the greater vestibular glands. Synonym: spatium perinei superficiale, Colles' space, superficial perineal pouch. (05 Mar 2000) |