Skeletal System

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Overview of the Skeletal System
Laszlo Vass, Ed.D.
Version 42-0018-00-01

Purpose

What is the purpose of this exercise?
The purpose is to be able to observe bones and identify structures within them Are there any safety concerns associated with this exercise? If so, list what they are and what precautions should be taken. A safety concern should be taken with using the microscope as well as using the oven.

Exercise 1: The Chemical Components of Bone Questions A. Describe the effect that the lemon juice (acid) had on the chicken leg bone.
The chicken leg bone got more bendable and jelly-like because the acid destroyed the calcium in the bone.

B. Describe the effect that baking (heat) had on the chicken leg bone.

The heat made it more rough and less flexible and brittle.

C. Rickets is a disease where the bones are not formed completely in children due to a lack of Vitamin D. Does the heated or acid-soaked bone represent a child with rickets? Explain why.

Yes, because the acid-soaked bone had the calcium broken down, which is similar to what happens to children with Rickets. Children who are afflicted with Rickets aren’t able to form a sufficient amount of calcium in their bones.

Exercise 2: Microscopic Structure of Bone Observations Observe the structure of the Haversian system. Sketch what is seen and identify the following: central canal, lacunae, concentric lamellae, canaliculi and an osteocyte.

Questions
A. Which part of the Haversian system was the hardest to see on the slide of compact bone? Why do you suppose this is?

The hardest part to see was the canaliculi, it was very small making it difficult to be observed through the microscope.

B. Which structures in the compact bone deliver nutrients to the osteocytes?

The canaliculi.

C. Which structures are found inside the...
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