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A small opening, perforation, or orifice; a fenestra. Foramen of Monro (Anat.), the opening from each lateral into the third ventricle of the brain. -- Foramen of Winslow (Anat.), the opening connecting the sac of the omentum with the general cavity of the peritoneum.

Also used of the body only of the vertebra, which is prolonged anteriorly within the foramen of the first vertebra or atlas, so as to form the odontoid process or peg which serves as a pivot for the atlas and head to turn upon.

The middle of the anterior margin of the great foramen of the skull.

Of or pertaining to a condyle. Condylar foramen (Anat.), a formen in front of each condyle of the occipital bone; -- sometimes called the anterior condylar foramen when a second, or posterior, foramen is present behind the condyle, as often happens in man.

The foramen or passage through the inner integument of an ovule.

or cutting; of or pertaining to the incisors; incisive; as, the incisor nerve; an incisor foramen; an incisor tooth.

Below the orbit; as, the infraorbital foramen; the infraorbital nerve.

Of or pertaining to the jugular vein; as, the jugular foramen.

ng as an obturator; closing an opening; pertaining to, or in the region of, the obturator foramen; as, the obturator nerve. Obturator foramen (Anat.), an opening situated between the public and ischial parts of the innominate bone and closed by the obturator membrane; the thyroid foramen.

(Anat.), the bone which forms the posterior segment of the skull and surrounds the great foramen by which the spinal cord leaves the cranium. In the higher vertebrates it is usually composed of four bones, which become consolidated in the adult. -- Occipital point (Anat.), the point of the occiput in the mesial plane…

The middle of the posterior, or dorsal, margin of the great foramen of the skull.

the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen.

The foramen of Monro. B. G. Wilder.

supraoccipital bone. Supraoccipital bone (Anat.), a bone on the dorsal side of the great foramen of the skull, usually forming a part of the occipital in the adult, but distinct in the young.

trachea. -- Thyroid dislocation (Surg.), dislocation of the thigh bone into the thyroid foramen. -- Thyroid foramen, the obturator foramen.