In the blood
There are different forms of mesenchymal cells and tissues found almost everywhere in the body, and these tissues can be thought of, broadly, as: connective tissues, blood vessels, and lymphatic vessels.Mesenchymal cells/ tissues originate from the middle embryonic germ layer (there are 3 - endoderm, mesoderm, ectoderm) called the "mesoderm" and differentiate into the body's various connective tissues found in bone, cartilage, ligaments, tendons, muscles, skin, organs, extracellular matrix, as they also form the blood vessels and lymphatic vessels.
Blood vessels in these canals supply blood to osteons deeper in the bone and to tissues of the medullary cavity.
This bone was located near the brain. This bone had nerves running through it.
There are four main types of blood vessels in the human body. There are arteries which are elastic vessels that transport blood away from the heart. Then there are veins which are elastic vessels that transport blood to the heart. Next, there are capillaries which are extremely small vessels found within the body tissues that transport blood from the arteries to the veins. And last, there are the sinusoids which are extremely small vessels found in the liver, the spleen, and in bone marrow.
Except for the hardest sections of compact bone, bones are living tissue, and so must be provided with oxygen and the materials to maintain or repair themselves. The interior of most bones are an open framework of spongy tissue called trabecular or cancellous bone. In the outer bone, the Haversian Canals form conduits for nerves and blood vessels.
The inner part of the bone is called bone marrow. In fact, new blood is produced in bone marrow, not the blood vessels.
Volkmann's canals are nerves that run across the surface of the bone.
The dermis, or lower layer of the skin, contains blood vessels and sensory nerve endings
Cells that make up the mesenchymal tissues of the body ie fibrous connective tissue, cartilage, some of the bone cells, blood vessels etc.
Osteonic canals contain blood vessels that connect to the long axis of the bone. The blood vessels that are connected perforate the canals of the bone and provide vessels to the surface of the bone which makes the bone hard.
compact bone
Canals in the bone in which blood vessels pass. Blood vessels from outside the bone penetrate the compact bone to the spongy bone through the PERFORATING CANALS.