Skeletal System

Osteons are a characteristic of compact bone tissue in the skeletal system. They consist of concentric rings of bone matrix called lamellae surrounding a central canal that contains blood vessels and nerves. Osteons provide structural support and help in the transportation of nutrients and waste in bone tissue.

Yes, a tumor on the spine can be dangerous as it may compress the spinal cord or nerves, leading to symptoms such as pain, weakness, or paralysis. Treatment options depend on the type of tumor, its location, and extent of spinal cord compression. Close monitoring and prompt medical intervention are crucial in managing spinal tumors.

A REA (reamer-irrigator-aspirator) device is a surgical tool used in bone graft harvest for a fractured femur. It is designed to remove bone marrow and create a cavity in the bone for graft placement while simultaneously irrigating and aspirating to reduce the risk of thermal necrosis and contamination with bone debris or fat. The REA device helps in harvesting bone graft without the need for a separate irrigation/aspiration system.

The backbone isn't made up of one bone; it's comprised of several small bones called vertebrae.

And adult human has 206 bones in their body. For sake of argument - we'll compute in adult standards: As of May 2009 there are: 6, 634, 236, 512 people on Earth. So, 6634236512 x 206 = *drum roll please* 1, 366, 652, 721, 472 human bones in living individuals on the Earth. (One trillion, 366 billion, 652 million, 721 thousand, 472) This does not include dead and buried bones or animal bones.

You have sesamoidtitis. caused when their is to much pounding or pressure on the ball of your foot. I had this problem two and it got so bad it fractured the sesimoid bone. the bone is a tiny little bone in the ball of your foot, their are 2 of the same bone one on the outside and one on the inside, you should know which bone is injured by where most of the pain comes from (the outer or inner part of the ball on of your foot). their are different ways to approach the situation by either having a boot to rest your foot for a few weeks. crutches are your choice. if you really want to rest it u can have your doctor put a cast on it. also you can get a coutarzon shot to eaz the pain. last if this doesn't go away after numerous times, rest and treatment their is also the option of removing the sesimoid.

i believe that i have a twisted collar bone. quite a good physio diagnosed this. it occured when i was trying out snowboarding (i should have stuck to skiing) and came down heavy on the shoulder. i thought i had really damaged it at the time but as i got up, everything worked.

a few monnths later i noticed some 'clicking' sounds as i moved the shoulder. eventually i saw the physio who measured all the angles and done a grip strength test showing the affected side was a lot weaker - transmitting all the way down to the biceps and forearms.

as usual with physio i didnt do any of the exercises but really should. i might try swimming to build the muscle up again and get good movement. i still have to lean against a wall with my arm raised (ala Lethal Weapon) to force the collar bone back and i feel it pop back into place.

pelvic bone

The blood-brain barrier is a protective mechanism made up of specialized cells (endothelial cells) lining blood vessels in the central nervous system. These cells restrict the passage of substances from the blood into the brain, helping to protect neurons from potential toxins and pathogens.

The spine of a book is called the backbone. It is the part of the book that faces outward when placed on a shelf and typically displays the title, author, and publisher.

Children have more bones than adults because some bones fuse together as they grow. For example, the skull of a child is made up of many bones that gradually fuse into a single structure by adulthood. Additionally, children have more cartilage, which will eventually ossify into bone as they mature.

The tibia is medial to the fibula. The tibia is the larger of the lower leg bones.

Yes, skeleton bones can decompose over time, breaking down into smaller pieces due to environmental factors like moisture, temperature, and microbial activity. However, the process of bone decomposition is slower compared to other organic materials.

the eye lies in the orbital cavity, a fossa made up of many bones of the skull! there is no orbital bone in the eye.

The calcaneus, or heel, is the strongest bone in the body. Thanks to the density and resistance to forces of standing, walking, and running. Often the femur is considered the strongest because of size and flexible properties.

The muscles that contract to bring two bones closer together are called flexor muscles. These muscles work by decreasing the angle between the two bones, resulting in movement such as bending the arm or leg.

The extension of the pelvis that encircles the apex of the pyramid is called the pelvic brim, also known as the pelvic inlet. It is the upper border of the pelvic cavity and is defined by the bony edges of the pelvic bones.

No, bone marrow cells are not fully differentiated. They include stem cells that have the potential to differentiate into various types of blood cells, like red blood cells, white blood cells, and platelets. These stem cells are essential for replenishing the body's blood cell supply.

The epiphyseal plate is a section of hyaline cartilage that seperates the epiphysis from the diaphysis in long bones. The growth and ossification of the epiphyseal plate is responsible for the bone growing longer. Articulate cartilage is similar, however, it is found on the outside layer of the epiphysis. It grows and resorbs allowing for the remodelling of the bone. The epiphyseal line is the remains of the epiphyseal plate once it has stopped growing.

The spinal column is a series small bones that helps support the body and surrounds the spinal cord which has nerve links from the cord to various parts of the body and leading back to the brain.

The energy density at the surface of a charged conductor is the surface charge density squared , divided by 2 x the permittivity of free space. The surface charge density is the charge divided by the area it sits on. So if, e = permittivity = 8.85 x 10^-12 CC/Nmm and D = surface charge density, and U = energy density and R = radius of sphere and q = charge on sphere, then; U = (1/2e) x D^2 where D = q/4piR^2 = 1.1 x 10^-9/(4 x 3.14 x 1) = 8.76 x 10^-11 , where 4piR^2 is the surface area of a sphere. So; D^2 = 76.7 x 10^-22 then ; U = (76.7 x 10^-22)/(17.7 x 10^-12) = 4.33 x 10^-10 Joules/mmm