Where is spongy bone tissue found

Also included here are the types of f.. The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial.. Humans are capable of only one mode of reproduction, i. Haploid sex cells gametes are produced.. Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme.. Organisms employ different strategies to boost its defenses against antigens.

Humans have an immune system to combat pat.. This tutorial describes the role of gibberellin family in plants. Figure 1. The inner layer of bones consists of spongy bone tissue. The small dark ovals in the osteon represent the living osteocytes.

Whereas compact bone tissue forms the outer layer of all bones, spongy bone or cancellous bone forms the inner layer of all bones.

Spongy bone tissue does not contain osteons that constitute compact bone tissue. Instead, it consists of trabeculae , which are lamellae that are arranged as rods or plates. Red bone marrow is found between the trabuculae. Blood vessels within this tissue deliver nutrients to osteocytes and remove waste. The red bone marrow of the femur and the interior of other large bones, such as the ilium, forms blood cells.

Figure 2. Trabeculae in spongy bone are arranged such that one side of the bone bears tension and the other withstands compression. Spongy bone reduces the density of bone and allows the ends of long bones to compress as the result of stresses applied to the bone.

Spongy bone is prominent in areas of bones that are not heavily stressed or where stresses arrive from many directions. The epiphyses of bones, such as the neck of the femur, are subject to stress from many directions. Imagine laying a heavy framed picture flat on the floor. You could hold up one side of the picture with a toothpick if the toothpick was perpendicular to the floor and the picture. Now drill a hole and stick the toothpick into the wall to hang up the picture.

In this case, the function of the toothpick is to transmit the downward pressure of the picture to the wall. The force on the picture is straight down to the floor, but the force on the toothpick is both the picture wire pulling down and the bottom of the hole in the wall pushing up. The toothpick will break off right at the wall. The neck of the femur is horizontal like the toothpick in the wall. The weight of the body pushes it down near the joint, but the vertical diaphysis of the femur pushes it up at the other end.

It gives your body shape, it protects vital organs, and it's alive. That's right! When you think of the skeleton, what comes to mind? Hard, dry bones, right? You can thank artistic conditioning in kindergarten for that one. The thing is, bones may be hard on the outside, but on the inside they're a smorgasbord of vessels, nerves, and other things.

I may just blow your mind with this post. Compact bone is dense bone tissue found on the outside of a bone. Basically, in kindergarten when you drew skeletons, you were drawing compact bone. Compact bone is enclosed, except where it's covered by articular cartilage, and is covered by the periosteum.

The periosteum is a thick fibrous membrane covering the entire surface of a bone and serving as an attachment for muscles and tendons. Vessels pass from the periosteum through pores into the compact bone and run through canals found throughout the tissue. Spongy bone is on the interior of a bone and consists of slender fibers and lamellae—layers of bony tissue—that join to form a reticular structure. Spongy bone is supplied by fewer and larger vessels than compact bone.

These vessels perforate the outer compact layer and are distributed into the spongy portion of bone, which is filled with marrow. Bone marrow is tissue found in long bones, like the femur, that contains stem cells.

Osteons are interesting little things. Osteons are structural units of compact bone. Each osteon consists of a central canal, which contains nerve filaments and one or two blood vessels, surrounded by lamellae. Lacunae, small chambers containing osteocytes, are arranged concentrically around the central canal. Bone marrow fills the cavities of long bones and occupies the spaces of spongy bone. Yellow marrow, consisting mostly of fat, is found in the central cavities of long bones.

Red marrow is found in the medullary cavities of flat and short bones, articular ends of long bones, vertebral bodies, spongy bone of the cranium, sternum, ribs, and scapulae.