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n. pl. fo·ram·i·na (-răm′ə-nə) or fo·ra·mens
An opening or orifice, as in a bone or in the covering of the ovule of a plant.

[Latin forāmen, an opening, from forāre, to bore.]

fo·ram′i·nal (-răm′ə-nəl), fo·ram′i·nous (-nəs) adj.


n, pl -ramina (-ˈræmɪnə) or -ramens
(Anatomy) a natural hole, esp one in a bone through which nerves and blood vessels pass
[C17: from Latin, from forāre to bore, pierce]
foraminal adj


(fəˈreɪ mən)

n., pl. -ra•mens, -ram•i•na (-ˈræm ə nə)
a small opening, orifice, or perforation, as in a bone or in the ovule of a plant.
[1665–75; < Latin forāmen hole, opening =forā(re) to bore1, pierce + -men resultative n. suffix]
fo•ram•i•nal (fəˈræm ə nl) adj.


A hole in a bone or between two body cavities.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.foramen - a natural opening or perforation through a bone or a membranous structureforamen - a natural opening or perforation through a bone or a membranous structure
foramen of Monro, interventricular foramen, Monro's foramen - the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere
foramen magnum - the large opening at the base of the cranium through which the spinal cord passes
opening, gap - an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
References in periodicals archive ?
All 37 cases with tumors in anterior skull base and all 14 cases with tumors in jugular foramen received total tumor removal.
Magnetic resonance imaging (MRI) showed a destructive and locally invasive tumor in the peripheral vestibular system on the left side expanding into the cerebellopontine angle, inferiorly toward the jugular foramen.
2, 3, 9, 13) Its sheath extends superiorly to the jugular foramen and inferiorly to the aortic arch and is bordered anteriorly by the styloid process and PPS, laterally by the anterior belly of the digastric muscle and the PS and medially by the lateral margin of the RPS.
One of the important foramen in the norma basalis is jugular foramen, which is the main route of venous outflow from the skull and is characterized by laterality based on the predominance of one of the sides.
1) It is formed by the union of the sigmoid and inferior petrosal dural venous sinuses within the jugular foramen.
The third finding on the same skull was the presence of an unusual large jugular foramen divided by a bridge of bone lateral to the right occipital condyle in front of condylar fossa.
Findings reflect right jugular foramen schwannoma, manifested by denervation of the right sternocleidomastoid and trapezius muscle as well as right portion of the tongue accounting for neuropathies of the glossopharyngeal, vagus, accessory and hypoglossal cranial nerves.
It is apparent just posteroinferior to the jugular foramen and posterior to the hypoglossal canal.
Fine-needle aspiration cytology of jugular foramen meningioma presenting as parapharyngeal mass.
The anatomical osseous landmarks at this level were the petrous apex with the carotid canal, the jugular foramen, the foramen lacerum, the sphenopetrosal fissure or suture, and the root of the pterygoid process.
Tegmen tympani, jugular foramen as well as condylar fossa and lateral semi-circular wall dehiscence were noted.