| NASA | National Aeronautics and Space Administration |
|---|---|
| PAS | para aminosalicylate; Parent Attitude Scale; patient administration system; patient appointments and... |
| PES | Patient Escort Service; photoelectron spectroscopy; physicians' equity services; polyethylene sulfon... |
| PLES | parallel-line equal space |
| RRS | retrorectal space; Richards-Rundle syndrome |
| 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) |
| Westberg's space | The space surrounding the origin of the aorta which is invested with the pericardium. (05 Mar 2000) |
| plantar space | One of four areas between fascial layers in the foot, where pus may be confined when the foot is infected. (05 Mar 2000) |
| pleural space | Although reference is often made to the pleural space (one dictionary defines pleural effusion as the presence of fluid in the pleural space ), there is normally only a small amount of fluid between the two layers of the pleura. (12 Dec 1998) |