6. Bones & Skeletal Tissue

What is the difference between a primary and secondary ossification center in a long bone?

Which bone structure is most closely associated with the perforating fibers?

Classify the bones in the following diagram according to their shape.

e. _____

Osgood-Schlatter disease is a painful condition that affects the proximal end of the tibia (a long bone) just distal to the knee. It primarily affects athletically active children between the ages of 10 and 14. The condition develops when the patellar tendon places strain on this area of the tibia as the area is not as stable as other regions of the bone in children this age. Why would this region not be as stable as other regions of the tibia?

Achondroplasia is the most common form of dwarfism. A person with this condition will have short arms and legs but a normal sized head and trunk. Achondroplasia literally means 'without cartilage formation'. Why would a disorder that affects cartilage formation lead to dwarfism?

Match the following terms with the correct definition.

____Long bone    

____Epiphysis    

____Nutrient artery    

____Flat bone    

____Short bone    

____Periosteum    

____Diaphysis    

____Medullary cavitya.

a. Main source of blood to the medullary cavity

b. Membrane surrounding the bone

c. Bone that is about as wide as it is long

d. Shaft of a long bone

e. Bone that is longer than it is wide

f. Canal running down the center of the diaphysis

g. End of a long bone

h. Bone that is broad and thin

Why are stresses or impacts to the side of the shaft in a long bone more dangerous than stress applied to the long axis of the shaft?

During a skiing accident, Jean-Luc breaks the shaft of his humerus. What is the anatomically correct term for the portion of the bone that he broke?

Long bones grow in length from the:

a. Diaphyseal line

b. Epiphyseal line

c. Epiphyseal plate

d. Medullary cavity