| 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) |
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| 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) |
| root foramen | The opening at the apex of the root of a tooth that gives passage to the nerve and blood vessels. Synonym: foramen apicis dentis, apical dental foramen, root foramen. (05 Mar 2000) |
| round foramen | <anatomy> An opening in the base of the greater wing of the sphenoid bone, transmitting the maxillary nerve. Synonym: round foramen. (05 Mar 2000) |
| Monro's foramen | The short, often slitlike passage that, on both the left and right side, connects the third brain ventricle (of the diencephalon) with the lateral ventricles (of the cerebral hemispheres); the passage is bounded anteriomedially by the column of fornix and posterolaterally by the anterior pole of the thalamus. Synonym: foramen interventriculare, Monro's foramen, porta. (05 Mar 2000) |
| Weitbrecht's foramen | An opening in the articular capsule of the shoulder joint, communicating with the subtendinous bursa of the subscapularis muscle. (05 Mar 2000) |
| Morgagni's foramen | <anatomy> A median pit on the dorsum of the posterior part of the tongue, from which the limbs of a V-shaped furrow run forward and outward; it is the site of origin of the thyroid gland and subsequent thyroglossal duct in the embryo. Synonym: foramen caecum linguae, blind foramen of the tongue, caecal foramen of the tongue, Morgagni's foramen, pleuroperitoneal foramen. (05 Mar 2000) |
| Winslow's foramen | The passage, below and behind the portal hepatis, connecting the two sacs of the peritoneum; it is bounded anteriorly by the hepatoduodenal ligament and posteriorly by a peritoneal fold over the inferior vena cava. Synonym: foramen omentale, foramen epiploicum, aditus ad saccum peritonei minorem, Duverney's foramen, Winslow's foramen. (05 Mar 2000) |
| pleuroperitoneal foramen | <anatomy> A median pit on the dorsum of the posterior part of the tongue, from which the limbs of a V-shaped furrow run forward and outward; it is the site of origin of the thyroid gland and subsequent thyroglossal duct in the embryo. Synonym: foramen caecum linguae, blind foramen of the tongue, caecal foramen of the tongue, Morgagni's foramen, pleuroperitoneal foramen. (05 Mar 2000) |
| conjugate foramen | A foramen formed by the notches of two bones in apposition. (05 Mar 2000) |
| costotransverse foramen | An opening between the neck of a rib and the transverse process of a vertebra, occupied by the costotransverse ligament. Synonym: foramen costotransversarium. (05 Mar 2000) |
| posterior condyloid foramen | The inconstant opening through the occipital bone posterior to the condyle on each side that transmits the occipital emissary vein. Synonym: canalis condylaris, posterior condyloid foramen. (05 Mar 2000) |