Ligamentum Teres

The ligamentum teres is a fibrous cord representing an obliterated left umbilical vein.21 Lying in the free edge of the triangular falciform ligament, the ligamentum teres ascends from the umbilicus to the ligamentum teres notch at the inferior border of the liver (Figs. 7-1 and 7-9). It then enters the liver, traverses the fissure for the ligamentum teres, and terminates by joining the left portal vein at the left extremity of the porta hepatis opposite the attachment of the ligamentum venosum.22

The extrahepatic segment of the ligamentum teres is located within the anterior peritoneal cavity and can be discerned when outlined by free air. It appears in the inferomedial aspect of the right upper quadrant, directed obliquely between the umbilicus and the ligamentum teres notch of the liver. It describes a straight or gently curved oblique interface with a clearly defined infero-lateral margin, or it is configured as a well-defined band of increased density of varying length13,23 (Figs. 7-3, 76, 7-7, 7-10). Its presentation on supine films depends on the quantity and position of free air as well as the shape and size of the ligament. The falciform ligament, if also delineated by air, can be seen together with the ligamentum teres as they merge caudally near the umbilicus (Figs. 7-3, 7-6, 7-7). The ligamentum teres sign requires a moderate to large amount of free air. Hence, it is nearly always accompanied by other signs of pneu-moperitoneum.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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