The linea terminalis or innominate line consists of the pectineal line

Pectineal line (pubis)

The pecten pubis or pectineal line of the pubis is a ridge on the superior ramus of the pubic bone.The pecten pubis forms part of the pelvic brim.Lying across it are fibers of the pectineal ligament and the proximal origin of the pectineus muscle....

, the arcuate line

Arcuate line (ilium)

The arcuate line of the ilium is a smooth rounded border on the internal surface of the ilium. It is immediately inferior to the iliac fossa and Iliacus muscle.It forms part of the border of the pelvic inlet....

, and the sacral promontory

Sacral promontory

The sacral promontory is the anatomical term for the superiormost portion of the sacrum. It marks part of the border of the pelvic inlet. The rectosigmoid junction is at the level of the sacral promontory....

.

It is part of the pelvic brim

Pelvic brim

The pelvic brim is the edge of the pelvic inlet. It is an approximately apple-shaped line passing through the prominence of the sacrum, the arcuate and pectineal lines, and the upper margin of the pubic symphysis....

, which is the edge of the pelvic inlet

Pelvic inlet

The pelvic inlet or superior aperture of the pelvis is a planar surface which is typically used to define the boundary between the pelvic cavity and the abdominal cavity .Its position and orientation relative to the skeleton of the pelvis is anatomically defined by its...

. The pelvic inlet is typically used to divide the abdominopelvic cavity

Abdominopelvic cavity

The abdominopelvic cavity is a body cavity that consists of the abdominal cavity and the pelvic cavity. It contains the stomach, liver, spleen, gallbladder, kidneys, and most of the small and large intestines. It also contains urinary bladder and internal reproductive organs....

 into an abdominal

Abdominal cavity

The abdominal cavity is the body cavity of the human body that holds the bulk of the viscera. It is located below the thoracic cavity, and above the pelvic cavity. Its dome-shaped roof is the thoracic diaphragm , and its oblique floor is the pelvic inlet...

 (above the inlet) and a pelvic cavity

Pelvic cavity

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 (below the inlet). Sometimes, the pelvis cavity is considered to extend above the pelvic inlet, and in this case the pelvic inlet is used to divide the pelvic cavity into a false

Greater pelvis

The greater pelvis is a portion of the cavity surrounded by the skeleton of the pelvis, situated above and in front of the pelvic brim...

 (above the inlet) and a true pelvis

Lesser pelvis

The lesser pelvis is that part of the space enclosed by the skeleton of the pelvis which is situated between the pelvic inlet and the pelvic floor. Some authors call this cavity the pelvic cavity...

(below the inlet).