Essential anatomy 3 how to hide all bones

#Essential anatomy 3 how to hide all bones skin#

For this reason, the medullary cavity is also referred to as the marrow cavity. While this channel may appear as hollow in many illustrations, this is actually where red and/or yellow bone marrow exists. Medullary cavity вЂ“ The medullary cavity is the central part of long bone shafts ( diaphysis). Osteoblasts produce a combination of minerals to form additional layers of cortical bone when stress is applied. A layer of osteoblast and osteoclast cells surround cortical bone along the cambrium. Compact bone is comprised of numerous passages allowing for blood vessels and nerves.

A combination of hydroxyapatite crystals and collagen fibers work together to provide bones their hardness and strength, as well as the correct amount of flexibility necessary for proper function. In the illustration, a portion of periosteum has been peeled back to reveal compact bone beneath. Periosteum does not exist in joints where there are typically areas of cartilage or at junctures where tendons and ligaments are attached to bone.Д¬ompact bone вЂ“ Also known as cortical bone, compact bone is thick and strong, situated just beneath the periosteum and meeting at the endosteum (the border of the medullary cavity). Osteoblast cells absorb calcium to create solid bone. The osteogenic layer contains stem cells and osteoblast cells. The fibrous periosteum is comprised of collagen fibers and fibroblast cells with a network of blood vessels and pain-sensitive nerve fibres. The periosteumвЂ™s two layers are referred to as fibrousВ periosteum (a fibrous outer layer) and osteogenic periosteum (a cellular inner layer also known as the cambrium). This essential membrane is attached to bones by strong collagenous fibers called SharpeyвЂ™s fibres. The periosteum plays a crucial role in bone growth and repair.

#Essential anatomy 3 how to hide all bones skin#

Periosteum вЂ“ You can think of the periosteum as a thin double-layered skin or membrane that covers the surface of all bones. The labels include periosteum, compact bone, nutrient artery & vein, medullary cavity, yellow bone marrow, endosteum, epiphyseal line, and spongy bone with red bone marrow. The following image gets into a little more detail in regard to human long bone structure. The labels include proximal epiphysis, proximal metaphysis, diaphysis (bone shaft), distal metaphysis, distal epiphysis, and epiphyseal line (x2). This image represents the parts of a long bone. These combined characteristics set long bones apart from other bones in the human body. Besides having a significant length vs width when compared to most other bones, long bones are also responsible for supporting weight and are facilitators of motion. Long bones include the humerus (upper arm), radius (forearm), ulna (forearm), femur (thigh), fibula (thin bone of the lower leg), tibia (shin bone), phalanges (digital bones in the hands and feet), metacarpals (long bones within the hand), and metatarsals (long bones within the feet). Long bones are one of the five bone types that are classified by shape. If you see errors or would like to suggest improvements, then please contact me via e-mail Any feedback is greatly appreciated. This post is a part of my recent quest to learn more about the human body and is considered a work in progress. For now, however, I want to start with the basics. I may create a detailed illustration of the femur at a later time for that specific purpose. In these labeled examples, a human femur is represented without identifying many of the unique characteristics that help differentiate the femur bone from other bones in the human body. On this page, you will find two images I created that illustrate the parts of a long bone and long bone structure.