| SNR | selective nerve root [block]; signal-to-noise ratio; substantia nigra zona reticulata; supernumerary... |
|---|---|
| SNRB | selective nerve root block |
| SRT | sedimentation rate test; simple reaction time; sinus node recovery time; sitting root test; speech r... |
| VR | right arm [electrode]; valve replacement; variable ratio; vascular resistance; venous reflux; venous... |
| VRP | ventral root potential |
| mandibular foramen | The opening into the mandibular canal on the medial surface of the ramus of the mandible giving passage to the inferior alveolar nerve, artery, and vein. Synonym: foramen mandibulae, inferior dental foramen. (05 Mar 2000) |
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| venous foramen | <anatomy> A minute inconstant foramen in the greater wing of the sphenoid bone, anterior and medial to the foramen ovale, transmitting a small emissary vein from the cavernous sinus. Synonym: emissary sphenoidal foramen, venous foramen, Vesalius' foramen. (05 Mar 2000) |
| venous plexus of foramen ovale | A venous network around the mandibular nerve connecting the cavernous sinus and the pterygoid plexus. Synonym: plexus venosus foraminis ovalis, rete foraminis ovalis. (05 Mar 2000) |
| vertebral foramen | The foramen formed by the union of the vertebral arch with the body; in the articulated vertebral column, the vertebral foramen collectively form the vertebral column. Synonym: foramen vertebrale. (05 Mar 2000) |
| carotid foramen | The opening at each extremity of the carotid canal in the petrous portion of the temporal bone; the external carotid foramen is on the inferior surface of the pyramid; the internal is at the apex. (05 Mar 2000) |
| vertebroarterial foramen | Foramen processus transversus. Synonym: foramen processus transversi, foramen transversarium, foramen vertebroarterialis, foramen of transverse process, vertebroarterial foramen. (05 Mar 2000) |
| parietal foramen | An inconstant foramen in the parietal bone occasionally found bilaterally near the sagittal margin posteriorly; when present it transmits an emissary vein to the superior sagittal sinus. Synonym: foramen parietale. (05 Mar 2000) |
| Vesalius' foramen | <anatomy> A minute inconstant foramen in the greater wing of the sphenoid bone, anterior and medial to the foramen ovale, transmitting a small emissary vein from the cavernous sinus. Synonym: emissary sphenoidal foramen, venous foramen, Vesalius' foramen. (05 Mar 2000) |
| mastoid foramen | An opening at the posterior portion of the mastoid process, transmitting the mastoid branch of the occipital artery to the dura and an emissary vein to the sigmoid sinus. Synonym: foramen mastoideum. (05 Mar 2000) |
| Vicq d'Azyr's foramen | <anatomy> A small triangular depression at the lower boundary of the pons that marks the upper limit of the median fissure of the medulla oblongata. Synonym: foramen caecum posterius, Vicq d'Azyr's foramen. (05 Mar 2000) |
| Retzius' foramen | One of the two lateral openings of the fourth ventricle into the subarachnoid space at the cerebellopontine angle. Synonym: apertura lateralis ventriculi quarti, foramen lateralis ventriculi quarti, foramen of Key-Retzius, foramen of Luschka, Retzius' foramen. (05 Mar 2000) |
| mental foramen | The anterior opening of the mandibular canal on the body of the mandible lateral to and above the mental tubercle giving passage to the mental artery and nerve. Synonym: foramen mentale, mental canal. (05 Mar 2000) |
| greater palatine foramen | An opening in the posterolateral corner of the hard palate opposite the last molar tooth, marking the lower end of the pterygopalatine canal. Synonym: foramen palatinum majus, anterior palatine foramen. (05 Mar 2000) |
| great foramen | <anatomy> The large hole at the base of the skull which allows passage of the spinal cord. (12 Dec 1998) |
| petrosal foramen | An occasional opening in the greater wing of the sphenoid bone, between the foramen spinosum and foramen ovale, which transmits the lesser petrosal nerve. Synonym: foramen petrosum, canaliculus innominatus, foramen of Arnold. (05 Mar 2000) |