What are the 4 zones of the epiphyseal plate?

Terms in this set (4)

• Proliferation Zone. Zone 1. Cartilage cells undergo mitosis.
• Hypertrophic Zone. Zone 2. Older cartilage cells enlarge.
• Calcification Zone. Zone 3. Matrix becomes calcified; cartilage cells die; matrix begins deteriorating.
• Ossification Zone. Zone 4. New bone formation is occurring.

What are the five layers of the epiphyseal plate?

Five zones of epiphyseal growth plate includes: 1. resting zone, 2. proliferation zone, 3. hypertrophic cartilage zone, 4.

Does the epiphyseal plate consist of 4 zones of chondrocytes?

The epiphyseal plate is composed of four zones of cells and activity. The reserve zone, the region closest to the epiphyseal end of the plate, contains small chondrocytes within the matrix.

What are the 5 zones of endochondral ossification?

Again, observe the zones of reserve cells, proliferation, maturation, hypertrophy, calcification, ossification and resorption.

How the epiphyseal plate grows?

Bones grow in length at the epiphyseal plate by a process that is similar to endochondral ossification. The cartilage in the region of the epiphyseal plate next to the epiphysis continues to grow by mitosis. The chondrocytes, in the region next to the diaphysis, age and degenerate.

What is the epiphyseal plate?

A growth plate, also called an epiphyseal plate, is a section of cartilage located at the ends of the long bones of children and teenagers. It is here that new bone develops to add length as the child grows. Once a person has physically matured, usually in adolescence, these plates permanently close to form solid bone.

What is Osteon?

Osteon, the chief structural unit of compact (cortical) bone, consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the Haversian canal (named for Clopton Havers, a 17th-century English physician).

What are the growth plate zones?

The chondrocytes in the growth plates are surrounded by matrix consisting of proteoglycan aggregates and are divided into three zones, reserve/resting zone, proliferative zone and hypertrophic zone.

What are the 7 steps of endochondral ossification?

7 steps:

• Development of the cartilage model.
• Growth of the cartilage model.
• Development of the primary ossification center.
• Development of the Medullary cavity.
• Secondary ossification centers.
• Formation of articular cartilage & epiphyseal plate.
• Closure of Growth Plate (epiphyseal plate hardens)

What is periosteal collar?

The periosteal collar causes the underlying cartilage cells to begin to degenerate and die. The primary center of ossification begins by calcification of matrix of the diaphysis and eroding by blood vessels. These blood vessels bring osteoprogenitor cells with them when they penetrate the bone collar.

What is the function of epiphyseal plate?

The epiphyseal growth plate is the main site of longitudinal growth of the long bones. At this site, cartilage is formed by the proliferation and hypertrophy of cells and synthesis of the typical extracellular matrix. The formed cartilage is then calcified, degraded, and replaced by osseous tissue.

What is the function of epiphyseal plates?

What is the function of the epiphyseal line?

Once the entire growth plate is ossified, the epiphyseal line has formed. The epiphyseal plate is the portion of the bone that is responsible for a bone’s growth in length. It is formed from cartilage cells that are constantly dividing within the growth plate.

Where is the epiphyseal line located?

Epiphyseal Line. The structure indicated is the epiphyseal line. The epiphyseal plate is a plate of hyaline cartilage found in children and adolescents, located in the metaphysis at the ends of each long bone.

What is the definition of epiphyseal line?

Medical Definition of epiphyseal line. : the line marking the site of an epiphyseal plate that has has stopped growing and become ossified.