Ostium
Encyclopedia
Ostium may refer to:

Anatomy
  • Ostium of Fallopian tube
    Ostium of Fallopian tube
    The ostium of the Fallopian tube may refer to the proximal or distal opening of the tube.The proximal tubal opening is located within the uterus at the uterotubal junction and accessible via hysteroscopy...

  • Ostium primum
    Ostium primum
    In the developing heart, the atria initially communicate with each other by an opening between the free edge of the septum primum and the AV cushions, known as the primary interatrial foramen or ostium primum , below the free margin of the septum.-Closing of ostium primum:This opening is closed by...

     or foramen ovale
    Foramen ovale
    There are multiple structures in the human body with the name foramen ovale :* In the fetal heart, the foramen ovale is a shunt from the right atrium to left atrium....

     (ostium secundum) of the developing heart
  • Ostium maxillare
    Ostium maxillare
    Below the bulla ethmoidalis, and partly hidden by the inferior end of the uncinate process, is the maxillary hiatus ; in a frontal section this opening is seen to be placed near the roof of the sinus.-External links:* *...

     of the maxillary sinus
  • Ostium of female lepidoptera genitalia
    Lepidoptera genitalia
    The study of the genitalia of Lepidoptera is important for Lepidoptera taxonomy in addition to development, anatomy and natural history. The genitalia are complex and provide the basis for species discrimination in most families and also in family identification. The genitalia are attached onto the...

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