Therefore, new layers are formed on the surface of pre-existing bones, increasing the thickness of the bone. Appositional growth can even continue after the cease of interstitial growth. During the appositional growth, both bone formation and reabsorption take place. Osteoclasts resorb old bone while osteoblasts produce new bone tissue. Appositional growth not only increases the diameter of the diaphysis but also increases the diameter of the medullary cavity.
Interstitial growth is the increase in the length of bones by the cartilage lengthening and is replacing by bone tissue while appositional growth is the increase in the diameter of bones by the addition of bony tissue at the surface of the pre-existing bone. So, this is the key difference between interstitial and appositional growth. Interstitial growth allows bones to grow in length, while appositional growth allows bones to grow in diameter.
Moreover, interstitial growth occurs within lacunae while appositional growth happens on the surface of pre-existing cartilage. The following infographic tabulates the differences between interstitial and appositional growth for side by side comparison. Interstitial growth and appositional growth are two types of bone growth. Intramembranous Ossification Intramembranous ossification follows four steps.
The periosteum is a membrane that covers the outer surface of all bones, except at the joints of long bones. Endosteum lines the inner surface of the medullary cavity of all long bones. Bone Growth 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.
Osteoblasts move in and ossify the matrix to form bone. Osteoblast , large cell responsible for the synthesis and mineralization of bone during both initial bone formation and later bone remodeling. Osteoblasts form a closely packed sheet on the surface of the bone, from which cellular processes extend through the developing bone.
Chondrocytes , or chondrocytes in lacunae, are cells found in cartilage connective tissue. They are the only cells located in cartilage. They produce and maintain the cartilage matrix, which is a type of lake in which the chondrocytes swim.
There are two distinct types of ossification , intermembranous and endochondral. Intermembranous Ossification : This is the less common form of bone formation, being limited primarily to the flat bones of the skull such as the parietal, parts of the temporal, and parts of the maxilla. What do the canaliculi contain? The cytoplasmic processes of the osteocytes which contact each other via gap junctions nexus.
What do the gap junctions of canaliculi do? Allow small molecules, ions, nutrients, and metabolite passage between osteocytes. Here are 10 natural ways to build healthy bones. Eat Lots of Vegetables. What are the two types of bone formation? There are two processes that form our bones before we are born: intramembranous ossification and endochondral ossification. Intramembranous ossification is primarily responsible for forming the bones in our skull, and bones are formed from a specific type of connective tissue, called mesenchymal connective tissue.
What are two functions of bones? The major functions of the bones are body support, facilitation of movement, protection of internal organs, storage of minerals and fat, and hematopoiesis. Together, the muscular system and skeletal system are known as the musculoskeletal system. Where does growth in length occur? Growth in the length of a bone occurs in the epiphyseal plate. Chondrocytes increase in number within the proliferating zone of the epiphyseal plate.
What is the epiphyseal line? The epiphyseal line is a line at the end of long bones that are found in adults. The epiphyseal line replaces the epiphyseal plate that children and. What is epiphyseal growth? How does Appositional Growth Occur? CC BY 3. Some Common Disease in Bones Osteomalacia- some bones become very soft in nature due to deficiency in vitamin D and this condition is referred as osteomalacia that causes fracture in adults Osteoporosis it is a condition in which new bone is not formed that is generally old bone will be replaced by new bones which does not happen as a result fracture of bone occur even to a small injury and results in fracture Osteogenesis imperfecta it is a genetic disorder that causes the bone to become brittle in nature commonly called as brittle bone disease.
Content and Applications This topic is significant in the professional exams for both undergraduate and graduate courses, especially for Bachelors in Zoology Bachelors in General physiology Masters in Human physiology Masters in Anatomy and Physiology.
Related Concepts The skeletal system of human Skeletal muscles. Practice Problems 1. Difference between interstitial and appositional growth? Which hormones are involved in bone regulation? Where does interstitial and appositional growth occurs? Want more help with your biology homework? Tagged in. Terms of Service. All Rights Reserved.
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