ostium

Introduction

An opening or orifice.

More general terms

• anatomic structure

More specific terms

• abdominal ostium of uterine tube
• internal cervical os
• internal ostium/opening of uterine tube, (uterine ostium/opening of uterine tube)
• ostium primum (interatrial foramen primum)
• ostium secundum (interatrial foramen secundum)