0 a natural passage in the body, especially into a bone
It is formed from two centres, each of which is originally a ring round the carotid foramen.
It is remarkable that neither of these observers should have noticed the foramen in the testa.
The nerve trunks make their way out of the spinal canal through apertures between the vertebra, called the inter-vertebral foramina and then divide into numerous branches, their ramifications extending principally to the muscles and the skin.
The next three pairs of nerves all arise from the medulla, and escape from the cavity of the skull through the same foramen.
The teeth are smaller, and the infra-orbital foramen much larger.
The foramen ovale is enlarged to enable oxygenated blood to pass freely from the left atrium to the right atrium.
The foramen for the orbital artery, generally situated immediately above the ascending wing of the parasphenoid in albuloids, was not observed.
The arterial duct and the oval foramen were patent.
