Identify the error in the given statement.

A long bone is hollow and its cavity is filled with many lymphatic vessels.

Bone marrow:

1. Bone marrow is a semi-solid tissue which may be found within the spongy or cancellous portions of bones.
2. In birds and mammals, bone marrow is the primary site of new blood cell production or hematopoiesis.
3. It is composed of hematopoietic cells, marrow adipose tissue, and supportive stromal cells.
4. Red blood cells and white blood cells are formed in the bone marrow.

Final answer: A long bone is hollow and it is filled with bone marrow.