How does a traction epipphysis affect the shape of a boneSoluti.pdf

How does a traction epipphysis affect the shape of a bone?
Solution
The epiphysis is the rounded end of a long bone, at its joint with adjacent bone. Between the
epiphysis and diaphysis (the long midsection of the long bone) lies the metaphysis, in cluding the
epiphyseal plate (growth plate). At the joint, hthe epiphysis is covered with articular cartilage;
below that covering is a zone similar to the epiphyseal plate, known as subchondral bone.
The epiphysis is classified into four types: the pressure epiphysis that is involved in the
formation of joints, the traction epiphysis that facilitates the attachment for supporting tendons
and ligaments, the atavistic epiphysis that are fused bones and the aberrant epiphysis that differs
slightly in structure form the others.
Traction Epiphysis
The end portion of the long bone is non-articular in nature. In simple words, it does not form
joints. however, its nearness to the articular part of the bone makes the non- ossifying section, a
potential site of attachment for supporting ligaments and tendons. In the course of time, the
expanded area undergoes ossification. Tubercles of humerus and trochanters of the femur are the
typical examples of the non- articular end of long bones.
Ossification: In bone remodeling is the process of laying down new bone material by cells called
osteoblasts.It is synonymous with bone tissue formation. There are two processes resulting in the
formation of normal, healthy bone tissue: Intramembranous ossification is the direct laying down
of bone into the primitive connective tissue (mesenchyme), while endochondral ossification
involves cartilage as a precursor. In fracture healing, endochondral osteogenesis is the most
commonly occurring process, for example in fractures of long bones treated by plaster of Paris,
whereas fractures treated by open reduction and internal fixation with metal plates, screws, pins,
rods and nails may heal by intramembranous osteogenesis.Hererotopic ossification is a process
resulting in the formation of bone tissue that is often atypical, at an extraskeletal location.
Clacification is often confused with ossification . Clasification is synonymous with the formation
of calcium based salts and crystals within cells and tissue. It is a process that occurs during
ossification, but not vice versa. The exact mechanisms by which bone development is triggered
remains unclear, but it involves growth facters and cytokines in some ways.
Intramembranous Ossification : It forms the flat bones of the skull, clavicle and mandible.
Endochondral Ossification: It is the formation of long bones and other bones.This requries a
hyaline cartilage precursor. There are two centres of ossification for endochondral ossification.
The primary centre: In long bones, bone tissue first appears in the diaphysis(middle of shaft).
Chondrocytes multiply and form trebeculae.Cartilage is progressively eroded and replaced by
hardened bone, Extending towards the epiphysis.A pericho.

1. How does a traction epipphysis affect the shape of a bone?

Solution

The epiphysis is the rounded end of a long bone, at its joint with adjacent bone. Between the
epiphysis and diaphysis (the long midsection of the long bone) lies the metaphysis, in cluding the
epiphyseal plate (growth plate). At the joint, hthe epiphysis is covered with articular cartilage;
below that covering is a zone similar to the epiphyseal plate, known as subchondral bone.
The epiphysis is classified into four types: the pressure epiphysis that is involved in the
formation of joints, the traction epiphysis that facilitates the attachment for supporting tendons
and ligaments, the atavistic epiphysis that are fused bones and the aberrant epiphysis that differs
slightly in structure form the others.
Traction Epiphysis
The end portion of the long bone is non-articular in nature. In simple words, it does not form
joints. however, its nearness to the articular part of the bone makes the non- ossifying section, a
potential site of attachment for supporting ligaments and tendons. In the course of time, the
expanded area undergoes ossification. Tubercles of humerus and trochanters of the femur are the
typical examples of the non- articular end of long bones.
Ossification: In bone remodeling is the process of laying down new bone material by cells called
osteoblasts.It is synonymous with bone tissue formation. There are two processes resulting in the
formation of normal, healthy bone tissue: Intramembranous ossification is the direct laying down
of bone into the primitive connective tissue (mesenchyme), while endochondral ossification
involves cartilage as a precursor. In fracture healing, endochondral osteogenesis is the most
commonly occurring process, for example in fractures of long bones treated by plaster of Paris,
whereas fractures treated by open reduction and internal fixation with metal plates, screws, pins,
rods and nails may heal by intramembranous osteogenesis.Hererotopic ossification is a process
resulting in the formation of bone tissue that is often atypical, at an extraskeletal location.
Clacification is often confused with ossification . Clasification is synonymous with the formation
of calcium based salts and crystals within cells and tissue. It is a process that occurs during
ossification, but not vice versa. The exact mechanisms by which bone development is triggered
remains unclear, but it involves growth facters and cytokines in some ways.
Intramembranous Ossification : It forms the flat bones of the skull, clavicle and mandible.
Endochondral Ossification: It is the formation of long bones and other bones.This requries a
hyaline cartilage precursor. There are two centres of ossification for endochondral ossification.
The primary centre: In long bones, bone tissue first appears in the diaphysis(middle of shaft).

2. Chondrocytes multiply and form trebeculae.Cartilage is progressively eroded and replaced by
hardened bone, Extending towards the epiphysis.A perichondrium layer surrounding the cartilage
forms the perioteum, which generates osteogenic cells that them go on to make a collar that
encircles the outside of the bone and remodels the medullary cavity on the inside.The nutrient
artery enters via the nutrient foramen from a small opening in the diaphysis. It invades the
primary centre of ossification, bring osteogenic cells. The canel of the nutrient formation is
directed away from active end of bone when one end grows more than the other. When bone
grows at same rate at both ends, the nutrients artery is perpendicular to the bone. Most other
bones also have primary ossification centres, and bone is laid down in a similar manner.
Secondary centres: The secondary centres generally appear at the epiphysis. Secondary
ossification mostly occurs after birth(except for distal femur and proximal tibia which occurs
during fetal development). The epiphyseal arteries and osteogenic cells invade the epiphysis,
deposing osteoblasts and osteoclasts which eode the cartilage and bulid bone. This occurs at both
ends of long bones but only one end of digits and ribs.