BIO 135 Virtual Lab 7
Proximal Long Bones of the Limb
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The markings of the femur (left) and humerus (right).
Identification: These two bones both are
large and have a distinct rounded head, allowing for a great range of movement.
The femur has a distinct neck separating the head from the rest of the bone,
while the humerus lacks such a neck.
Determining side: In order to distinguish right from left, first orient
the bones so that the rounded head is superior (up) and pointing medially
(toward the body's midline). Then you will need to determine the anterior vs.
posterior side. On the femur, look for the patellar surface, which is anterior.
Also note how the articulating surfaces of the condyles extends far back on the
posterior side (since the knee bends back but not forward). On the humerus,
look for the deep olecranon fossa on the posterior side (where the olecranon
process of the ulna fits in when the elbow is straightened). Both specimens are
from the right side.
This
page created and maintained by Bill Snyder. Last updated August 20, 2008