Examples of foramen

• 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.