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; foramina, foramens (pl) (nouns)
A natural hole, passage, or opening in a bone or other body structure: "Although a foramen is usually through a bone, it can be an opening through other types of body tissue which permits the passage of nerves or blood vessels."
"There are many foramens in the cranium, or skull, that make it possible for the nerves and blood vessels pass through."
"Cranial nerves supply most of the sensory structures and muscles of the head and neck and the blood vessels that carry blood to and from the brain go through the foramens."
Word Entries containing the term:
foramen magnum (s) (noun)
The large hole at the bottom of the cranium or head:
"The foramen magnum is the large opening in the base of the skull through which the spinal cord passes."
"The foramen magnum is situated in the occipital bone which forms part of the base and the back of the skull and this hole allows the brain stem to enter the spinal canal, where it continues as the spinal cord."
foramen ovale (s)
, foramen ovales (pl) (nouns)
An oval opening between the two upper chambers of the heart (the atria) which is a normal characteristic of the fetal and neonatal (newborn) circulation: "The foramen ovale normally closes on its own when a person is three months of age."
interventricular foramen (s)
, interventricular foramina (pl) (nouns)
An opening between the lateral and third ventricles in a system of four communicating cavities within the brain that are connected to the central canal of the spinal cord: "The four ventricles consist of the two lateral ventricles, the third ventricle and the fourth ventricle:"
- Lateral ventricles: The lateral ventricles are in the cerebral hemispheres. Each lateral ventricle consists of a triangular central body and four horns.
The lateral ventricles communicate with the third ventricle through the interventricular foramen (opening).
- The third ventricle is a median (midline) cavity in the brain that is bounded by the thalamus and hypothalamus on either side.
Anteriorly (in front) the third ventricle communicates with the lateral ventricles and posteriorly (in back) the third ventricle communicates with what is called the aqueduct of the midbrain (or the aqueduct of Sylvius).
- The fourth ventricle is the most inferior (lowest) of the four ventricles of the brain.
It extends from the aqueduct of the midbrain to the central canal of the upper end of the spinal cord with which it communicates by the two foramina (openings) of Luschka and the foramen (opening) of Magendie.
The ventricles are filled with cerebrospinal fluid, which is formed by structures called choroid plexuses located in the walls and roofs of the ventricles.
intervertebral foramen (s) (noun)
, intervertebral foramina (pl)
An opening between vertebrae through which nerves leave the spine and extend to other parts of the body.
mental foramen, foramen mentale (s) (noun)
; mental foramina, foramen mentali (pl)
An opening on the lateral (side) part of the body of the mandible (lower jaw), inferior to (below) the second premolar teeth, through which the nerves to the chin and blood vessels pass: The mental foramen
transmits the mental nerves and vessels to the skin of the face.
A mental foramen (natural opening, usually through the bone) functions as the passage of blood vessels and a nerve on the outside of the lower jaw on each side near the chin.
neural foramen (s)
, neural foramina (pl) (nouns)
posterior foramen (s)
, posterior foramina (pl) (nouns)
The opening in an insect's head that goes to the thoracic cavity (part of an insect’s body where its legs and wings are joined): "The entomologist was studying the various posterior foramina of insects to classify the differences between one species and the others."
sciatic foramen, sacrosciatic foramen (s)
; sciatic foramina, sacrosciatic foramina (pl) (nouns)
Either of two foramina on each side of the pelvis that are formed by the hip bone: "The sacrospinous ligament, and the sacrotuberous ligament which form a passage from the pelvis to the gluteal area (buttock region formed by the gluteal muscles) and the peroneal regions (outer parts of the legs below the knees)."