What are the structures of a long bone

A long bone has two parts: the diaphysis

What is the structure and function of a long bone?

Long bones function to support the weight of the body and facilitate movement. Long bones are mostly located in the appendicular skeleton and include bones in the lower limbs (the tibia, fibula, femur, metatarsals, and phalanges) and bones in the upper limbs (the humerus, radius, ulna, metacarpals, and phalanges).

What are the 3 parts of the long bone?

Long bones are longer than they are wide. They can be divided into three regions – epiphysis, metaphysis and the diaphysis. The epiphysis contains the spongy bone (also called cancellous), which in turn contains the red bone marrow that is responsible for synthesizing blood cells.

What are the 4 parts of the long bone?

The long bone in a child is divided into four regions: the diaphysis (shaft or primary ossification centre), metaphysis (where the bone flares), physis (or growth plate) and the epiphysis (secondary ossification centre). In the adult, only the metaphysis and diaphysis are present (Figure 1).

What are the major features of a long bone?

Long bones are hard, dense bones that provide strength, structure, and mobility. The thigh bone (femur) is a long bone. A long bone has a shaft and two ends. Some bones in the fingers are classified as long bones, even though they are short in length.

What are the 7 parts of a long bone?

• epiphysis. The end of a long bone – an expanded portion at each end of the bone which articulates with another bone.
• articular cartilage. Hyaline cartilage that covers ends of bones in synovial joints.
• Diaphysis. The shaft of the bone.
• Periosteum. …
• Compact Bone. …
• Spongy bone. …
• Medullary Cavity. …
• Marrow.

What are the 6 parts of a long bone?

The long bone category includes the femora, tibiae, and fibulae of the legs; the humeri, radii, and ulnae of the arms; metacarpals and metatarsals of the hands and feet, the phalanges of the fingers and toes, and the clavicles or collar bones.

What do you understand by the structure of a bone?

Bones are organs composed of hard living tissue providing structural support to the body – it’s scaffolding. It is a hard matrix of calcium salts deposited around protein fibers. Minerals make bone rigid and proteins (collagen) provide strength and elasticity. … The outer layer of bone is called Cortical bone.

Which are long bones?

Bones that are longer than they are wide are called long bones. They consist of a long shaft with two bulky ends or extremities. They are primarily compact bone but may have a large amount of spongy bone at the ends or extremities. Long bones include bones of the thigh, leg, arm, and forearm.

What is the shaft of a long bone called?

medullary cavity. The shaft of a long bone is called the diaphysis.

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What is the innermost part of the long bone called?

A long bone, with medullary cavity labeled near center. The medullary cavity (medulla, innermost part) is the central cavity of bone shafts where red bone marrow and/or yellow bone marrow (adipose tissue) is stored; hence, the medullary cavity is also known as the marrow cavity.

Where does a long bone grow in length?

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.

What part of a long bone is the diaphysis?

A long bone has two main regions: the diaphysis and the epiphysis (Figure 6.3. 1). The diaphysis is the hollow, tubular shaft that runs between the proximal and distal ends of the bone. Inside the diaphysis is the medullary cavity, which is filled with yellow bone marrow in an adult.

What are 5 major parts of a long bone?

List five major parts of a long bone. Epiphysis, diaphysis, periosteum, yellow marrow, medullary cavity, compact bone, spongy bone, articular cartilage.

What is known as the long part of the bone that can be found along the arms and legs?

The humerus and the femur are corresponding bones of the arms and legs, respectively. … The head of the humerus is almost hemispherical, while that of the femur forms about two-thirds of a sphere.

Is the hollow shaft of a long bone?

The diaphysis is the hollow shaft of long bone. … The needlelike threads of spongy bone are called trabeculae.

What is the name referring to the ends of a long bone?

epiphysis, expanded end of the long bones in animals, which ossifies separately from the bone shaft but becomes fixed to the shaft when full growth is attained. The epiphysis is made of spongy cancellous bone covered by a thin layer of compact bone.

What type of bone is arranged in concentric layers?

The compact bone is a dense bone found in the diaphysis. Its repeated pattern is arranged in concentric layers of solid bone tissue. The compact bone can be seen as the layer just underneath the periosteum, color both ends.

What is the cylindrical space within the diaphysis of a long bone called?

the cylindrical space within the diaphysis of a long bone is called the. medullary cavity.

How do long bones elongate?

IN SUMMARY: Bone Growth and Development Long bones lengthen as chondrocytes divide and secrete hyaline cartilage. Osteoblasts replace cartilage with bone. Appositional growth is the increase in the diameter of bones by the addition of bone tissue at the surface of bones.

Where does a long bone grow in length quizlet?

The epiphyseal plate is the area of growth in a long bone. -it is a layer of hyaline cartilage where ossification occurs in immatur bones.

How does long bone grow in length and width?

Long bones lengthen at the epiphyseal plate with the addition of bone tissue and increase in width by a process called appositional growth.