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The tuberosity of the ischium is more informally known as a sitting bone. Its lower part is where the sacrotuberous ligament attaches.
No
Your bone.
That is the enlargement of the mother's abdomen during pregnancy.
This bump is called the external occipital protuberance.
It is a bone
It could be a swollen lymph node... or something serious... you should contact a doctor if it doesn't go away (or if it is painful right now).
ulna
A buried bone may appear as a protruding object in the ground, possibly with dirt or soil covering part of it. It may also be visible as a small bump or mound on the surface where the bone is buried. Over time, natural processes like erosion or animal activity could expose parts of the bone.
A baby bump is a visible sign of pregnancy, displaying itself as abdominal swelling in a pregnant woman.
Lower belly
It is called a tuberosity.