| 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 |
| 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) |
| pneumatic space | Any one of the paranasal sinuses. (05 Mar 2000) |
| Poiseuille's space | The layer of the bloodstream in the capillary vessels, next to the wall of the vessel, that flows slowly and transports the white blood cells along the layer wall, while in the centre the flow is rapid and transports the red blood cells. Synonym: plasma layer, Poiseuille's space, sluggish layer. (05 Mar 2000) |
| corneal space | One of the stellate space's between the lamellae of the cornea, each of which contains a cell or corneal corpuscle. Synonym: lacuna. (05 Mar 2000) |
| Cotunnius' space | The blind pouch at the end of the endolymphatic duct. (12 Dec 1998) |
| cranial epidural space | The intracranial dura mater, consisting of two layers: the outer periosteal layer which normally always adheres to the periosteum of the bones of the cranial vault; and the inner meningeal layer which in most places is fused with the outer. The two layers separate to accommodate meningeal vessels and large venous (dural) sinuses. The meningeal layer is also involved in the formation of the various dural folds, such as the falx cerebri and tentorium cerebelli and is comparable to and continuous with the dural mater of the spinal cord. The cranial epidural space is then a potential space between the bone and the combined periosteum/periosteal layer of the dura mater realised only pathologically and is neither continuous with or comparable to the vertebral epidural space. Synonym: dura mater cranialis, dura mater encephali, cerebral part of dura mater, cranial epidural space. (05 Mar 2000) |
| popliteal space | The diamond-shaped space posterior to the knee joint bounded superficially by the diverging biceps femoris and semimembranosus muscles above and inferiorly by the two heads of the gastrocnemius muscle; deeply, the fossa is bound superiorly by the diverging supracondylar lines of the femur and the soleal line of the tibia inferiorly. Contents: tibial nerve, popliteal artery, vein, fat. Synonym: fossa poplitea, poples, ham, popliteal region, popliteal space, popliteus. (05 Mar 2000) |
| postpharyngeal 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) |
| cyst, synovial, of the popliteal space | A swelling in the space behind the knee (the popliteal space). The swelling is composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Commonly called Baker's cyst. (12 Dec 1998) |
| Proust's space | A pocket formed by the deflection of the peritoneum from the rectum to the bladder in the male. Synonym: excavatio rectovesicalis, Proust's space. (05 Mar 2000) |
| Prussak's space | A space in the mucous membrane on the inner surface of the tympanic membrane between the flaccid part of the membrane and the neck of the malleus. Synonym: recessus membranae tympani superior, Prussak's pouch, Prussak's space. (05 Mar 2000) |
| His' perivascular space | A tunnel-like extension of the subarachnoid space surrounding blood vessels that pass into the brain or spinal cord from the subarachnoid space; the lining of the channel is composed of pia and glial feet of astrocytes; a continuation of the space around capillaries and nerve cells probably does not occur. Synonym: His' perivascular space. (05 Mar 2000) |
| pterygomandibular space | The area between the mandibular ramus and the pterygoid process of the sphenoid bone. (05 Mar 2000) |