Bone is resistant to bending, twisting, compression and stretch. It is hard, because it is calcified, and the collagen fibres help the bone to resist tensile stresses. If you dissolve away the calcium salts of bone, then the bone becomes rubbery because of the collagen fibres which are left behind.

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Compact bone tissue consists of units called osteons or Haversian systems. Each osteon consists of lamellae, which are layers of compact matrix that surround a central canal called the Haversian canal. The Haversian canal (osteonic canal) contains the bone’s blood vessels and nerve fibers (Figure 1).

In the center of each osteon is a Haversian canal. The canal serves as a passageway for blood vessels and nerves. Within each osteon, many bone cells called osteocytes are located.

Anatomy Chp 6-Bones

Osteon (Haversian canal) Osteons are cylindrical vascular tunnels formed by an osteoclast-rich tissue. They contain pluripotential precursor cells and endosteum known as the cutting cone. The bone removed by the cutting cone is replaced by osteoblast-rich tissue.

Bones, joints, cartilage, and ligaments. what are the five functions of the skeletal system?

Osteon (or Haversian System) Osteons (or Haversian system) are the structural unit of compact bone. They are cylindrical structures aligned with the long axis of a bone. Haversian Vessels – remnants of blood vessels and nerve fibers are seen in some canals.

The osteon or haversian system /həˈvɜːr. ʒən/ (named for Clopton Havers) is the fundamental functional unit of much compact bone. Osteons are roughly cylindrical structures that are typically between 0.25 mm and 0.35 mm in diameter.

Secondary osteons differ from primary osteons in that secondary osteons are formed by replacement of existing bone. Secondary bone results from a process known as remodeling. Following the osteoclasts are bone cells known as osteoblasts which then form bone to fill up the tunnel.

Haversian canals are a series of tubes around narrow channels formed by lamellae. The Haversian canals surround blood vessels and nerve fibers throughout the bone and communicate with osteocytes.

Each osteon looks like a ring with a light spot in the center. The light spot is a canal that carries a blood vessel and a nerve fiber. The darker ring consists of layers of bone matrix made by cells called osteoblasts (check your textbook for an explanation of the difference between osteoblasts and osteocytes).

Bone Introduction

A trabecula (plural trabeculae, from Latin for “small beam”) is a small, often microscopic, tissue element in the form of a small beam, strut or rod that supports or anchors a framework of parts within a body or organ. Cancellous bone is formed from groupings of trabeculated bone tissue.

Endochondral ossification involves the replacement of hyaline cartilage with bony tissue. Most of the bones of the skeleton are formed in this manner. These bones are called endochondral bones. In this process, the future bones are first formed as hyaline cartilage models.

Terms in this set (6)

• Cartilage enlarges; Chondrocytes die.
• blood vessels grow into perichondrium; cells convert to osteoblasts; shaft becomes covered with superficial bone.
• more blood supply and osteoblasts; produces spongy bone; formation spreads on shaft.
• Osteoclasts create medullary cavity; appositional growth.

A vascular connective tissue bud from the perichondrium that enters the cartilage of a developing long bone and contributes to the formation of a center for ossification.

around 7 to 9 days

(1)Cartilage matrix is calcified and chondrocytes die. (2)Chondrocytes hypertrophy. (3)Cartilage model is formed. (4)Osteoblasts deposit bone on the surface of the calcified cartilage called the primary ossification center.

Ossification (or osteogenesis) in bone remodeling is the process of laying down new bone material by cells named osteoblasts….Ossification.

There are two types of bone ossification, intramembranous and endochondral.

Bone formation, also called ossification, process by which new bone is produced. The process takes two general forms, one for compact bone, which makes up roughly 80 percent of the skeleton, and the other for cancellous bone, including parts of the skull, the shoulder blades, and the ends of the long bones.

According to the law of ossification, the centre of ossification that appears first,is the last to unite. The fibula bone violates the law as its distal end appears first but unites before its proximal part which appears [email protected]

A primary ossification center is the first area of a bone to start ossifying. A secondary ossification center is the area of ossification that appears after the primary ossification center has already appeared – most of which appear during the postnatal and adolescent years.

Conversely, the secondary ossification center is the area of ossification that appears after the primary center of ossification at the epiphysis of edges of bones.

The first center that appears is called the primary ossification center; its ossification usually begins in utero, and in long bones it corresponds to the diaphysis. Most secondary ossification centers appear after birth, and in long bones they correspond to the epiphyses.

1 : to change into bone The cartilages ossified with age. 2 : to become hardened or conventional and opposed to change so easy for the mind to ossify and generous ideals to end in stale platitudes— John Buchan. transitive verb. 1 : to change (a material, such as cartilage) into bone ossified tendons of muscle.

noun, plural en·vies. a feeling of discontent or covetousness with regard to another’s advantages, success, possessions, etc. an object of such feeling: Her intelligence made her the envy of her classmates.

verb intransitiveWord forms: scrammed or ˈscramming. 1. Slang. to leave or get out, esp. in a hurry.

1 : the making of verses. 2a : metrical structure : prosody. b : a particular metrical structure or style. 3 : a version in verse of something originally in prose.