| space sense | The faculty of perceiving the relative positions of objects in the external world. (05 Mar 2000) |
|---|---|
| space sickness | Dizziness as result of changes in inner ear resulting from absence of gravity. Synonym: physiologic vertigo. (05 Mar 2000) |
| space simulation | An environment simulating one or more parameters of the space environment, applied in testing space systems or components. Often, a closed chamber is used, capable of approximating the vacuum and normal environments of space. This also includes simulated extravehicular activity studies in atmosphere exposure chambers or water tanks. (12 Dec 1998) |
| space suits | Pressure suits for wear in space or at very low ambient pressures within the atmosphere, designed to permit the wearer to leave the protection of a pressurised cabin. (12 Dec 1998) |
| space-time clustering | A statistically significant excess of cases of a disease, occurring within a limited space-time continuum. (12 Dec 1998) |
| subarachnoid space | The space between the arachnoidea and pia mater, traversed by delicate fibrous trabeculae and filled with cerebrospinal fluid. Since the pia mater immediately adheres to the surface of the brain and spinal cord, the space is greatly widened wherever the brain surface exhibits a deep depression (for example, between the cerebellum and medulla); such widenings are called cisternae. The large blood vessels supplying the brain and spinal cord lie in the subarachnoid space. Synonym: cavum subarachnoideum, subarachnoid cavity. (05 Mar 2000) |
| subchorial space | The part of the placenta adjacently beneath the chorionic plate; it joins with irregular channels to form the marginal lakes. Synonym: subchorial lake. (05 Mar 2000) |
| subdural space | Originally thought to be a narrow fluid-filled interval between the dural and arachnoid; now known to be an artificial space created by the separation of the arachnoid from the dura as the result of trauma or some ongoing pathologic process; in the healthy state, the arachnoid is attached to the dura and a naturally occurring subdural space is not present. Synonym: spatium subdurale, cavum subdurale, subdural cavity, subdural cleavage, subdural cleft. (05 Mar 2000) |
| subgingival space | The space between the surface of the tooth and the free gingiva. Synonym: sulcus gingivalis, gingival crevice, gingival space, subgingival space. (05 Mar 2000) |
| Nuel's space | An interval in the spiral organ (of Corti) between the outer pillar cells on one side and the phalangeal cells and hair cells on the other. (05 Mar 2000) |
| dead space | A cavity, potential or real, remaining after the closure of a wound which is not obliterated by the operative technique. See: anatomical dead space, physiologic dead space. (05 Mar 2000) |
| suprasternal space | A narrow interval between the deep and superficial layers of the cervical fascia above the manubrium of the sternum through which pass the anterior jugular veins. Synonym: Burns' space. (05 Mar 2000) |
| denture space | That portion of the oral cavity which is, or may be, occupied by maxillary and/or mandibular denture(s), the space between the residual ridges which is available for dentures. See: interarch distance. (05 Mar 2000) |
| disk space | On radiographs of the spine, the radiolucent region between each pair of vertebral bodies. (05 Mar 2000) |
| Disse's space | The potential extravascular space between the liver sinusoids and liver parenchymal cells. Synonym: Disse's space. (05 Mar 2000) |