Professional
Technical
In the Industry Vocabulary Test
velamentous cord insertion
Abnormal umbilical cord insertion where vessels travel through fetal membranes before reaching the placenta, creating risk of vessel rupture.
Full Definition
A placental abnormality where the umbilical cord inserts into the fetal membranes rather than directly into the placental disc. The umbilical vessels then travel unprotected through the chorioamniotic membranes before reaching the placenta. This condition occurs in approximately 1% of singleton pregnancies but is more common in multiple gestations. The exposed vessels are vulnerable to compression or rupture, potentially leading to fetal hemorrhage and death.
Usage
Usage note: Often confused with marginal insertion; velamentous specifically refers to vessels traveling through membranes.
In Context
- "The ultrasound revealed velamentous cord insertion with vessels crossing the internal cervical os." — Prenatal diagnostic report
- "Velamentous cord insertion was identified during routine third-trimester screening, prompting closer monitoring." — Obstetric consultation note
Also known as
membranous insertion
Contrasted with
central cord insertion
Don't confuse with
marginal cord insertion
battledore placenta