| 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) |
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| 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) |
| Henke's space | Retropharyngeal space. (05 Mar 2000) |
| 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) |
| space | 1. Extension, considered independently of anything which it may contain; that which makes extended objects conceivable and possible. "Pure space is capable neither of resistance nor motion." (Locke) 2. Place, having more or ess extension; room. "They gave him chase, and hunted him as hare; Long had he no space to dwell [in]" (R. Of Brunne) "While I have time and space." (Chaucer) 3. A quantity or portion of extension; distance from one thing to another; an interval between any two or more objects; as, the space between two stars or two hills; the sound was heard for the space of a mile. "Put a space betwixt drove and drove." (Gen. Xxxii. 16) 4. Quantity of time; an interval between two points of time; duration; time. "Grace God gave him here, this land to keep long space." "Nine times the space that measures day and night." (Milton) "God may defer his judgments for a time, and give a people a longer space of repentance." (Tillotson) 5. A short time; a while. "To stay your deadly strife a space." 6. Walk; track; path; course. "This ilke [same] monk let old things pace, And held after the new world the space." (Chaucer) 7. A small piece of metal cast lower than a face type, so as not to receive the ink in printing, used to separate words or letters. The distance or interval between words or letters in the lines, or between lines, as in books. Spaces are of different thicknesses to enable the compositor to arrange the words at equal distances from each other in the same line. 8. One of the intervals, or open places, between the lines of the staff. Absolute space, Euclidian space, etc. See Absolute, Euclidian, etc. Space line, a fine, thin, short metal rule of the same height as the type, used in printing short lines in tabular matter. Origin: OE. Space, F. Espace, from L. Spatium space; cf. Gr. To draw, to tear; perh. Akin to E. Span. Cf. Expatiate. Source: Websters Dictionary (01 Mar 1998) |
| space adaptation syndrome | <syndrome> Alterations in normal physiology that occur during prolonged exposure to weightlessness, unless preventive measures are taken. Characterised by muscle atrophy, loss of mineral from bones, cardiovascular changes, etc. (05 Mar 2000) |
| space flight | Travel beyond the earth's atmosphere. (12 Dec 1998) |
| space frame | Three-dimensional optical bench that holds laser components stable from vibrational and thermal excursions. (09 Oct 1997) |
| space maintainer | <dentistry> A gadget used to maintain a space in your mouth. You would use a space maintainer when you lose one of your baby teeth. The space maintainer will keep a space in your mouth until a permanent tooth comes in to fill the space. (08 Jan 1998) |
| space medicine | The field of medicine concerned with physiologic diseases or disturbances resulting from the unique conditions of space travel. (05 Mar 2000) |