| foramen petrosum | 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) |
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| foramen processus transversi | Foramen processus transversus. Synonym: foramen processus transversi, foramen transversarium, foramen vertebroarterialis, foramen of transverse process, vertebroarterial foramen. (05 Mar 2000) |
| foramen quadratum | An opening in the right lobe of the central tendon of the diaphragm which transmits the inferior vena cava and branches of the right phrenic nerve. Synonym: foramen venae cavae, foramen of vena cava, foramen quadratum. (05 Mar 2000) |
| foramen rotundum | <anatomy> An opening in the base of the greater wing of the sphenoid bone, transmitting the maxillary nerve. Synonym: round foramen. (05 Mar 2000) |
| foramen sacrale | One of the openings between the fused sacral vertebrae transmitting the sacral nerves. The anterior sacral foramina transmit ventral primary rami of the sacral nerves. The posterior sacral foramina give passage to dorsal primary rami of the sacral nerves. Synonym: foramen sacrale. (05 Mar 2000) |
| foramen singulare | A foramen in the internal acoustic meatus, posterior to the cochlear area, that transmits the nerves to the ampulla of the posterior saemicircular duct. Synonym: foramen singulare. (05 Mar 2000) |
| foramen sphenopalatinum | The foramen formed from the sphenopalatine notch of the palatine bone in articulation with the sphenoid bone; it transmits the sphenopalatine artery and accompanying nerves. Synonym: foramen sphenopalatinum. (05 Mar 2000) |
| foramen spinosum | <anatomy> Transmits middle meningeal artery (12 Dec 1998) |
| foramen stylomastoideum | The distal or external opening of the facial canal on the inferior surface of the petrous portion of the temporal bone, between the styloid and mastoid processes; it transmits the facial nerve and stylomastoid artery. Synonym: foramen stylomastoideum. (05 Mar 2000) |
| foramen subseptale | In the embryonic heart, the temporary opening between right and left atria situated between the lower margin of the septum primum and the atrioventricular canal cushions, in an adult heart, the abnormal persistence of the so-named communication which is normal in young embryos. Synonym: foramen subseptale, ostium primum, primary interatrial foramen. (05 Mar 2000) |
| foramen supraorbitale | A foramen in the supraorbital margin of the frontal bone at the junction of the medial and intermediate thirds. Synonym: foramen supraorbitale. (05 Mar 2000) |
| foramen thyroideum | An opening occasionally existing in one or both of the plates of the thyroid cartilage. Synonym: foramen thyroideum. (05 Mar 2000) |
| foramen transversarium | Foramen processus transversus. Synonym: foramen processus transversi, foramen transversarium, foramen vertebroarterialis, foramen of transverse process, vertebroarterial foramen. (05 Mar 2000) |
| foramen venae cavae | An opening in the right lobe of the central tendon of the diaphragm which transmits the inferior vena cava and branches of the right phrenic nerve. Synonym: foramen venae cavae, foramen of vena cava, foramen quadratum. (05 Mar 2000) |
| foramen venosum | <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) |