Chapter 6
Bones and Skeletal Tissues
175
6
Generally, bones are classified by their shape as long, short,
flat, or irregular
(Figure 6.2)
.
Long bones
, as their name suggests, are considerably longer
than they are wide (Figure 6.2a). A long bone has a shaf plus
two ends which are ofen expanded. All limb bones except
the patella (kneecap) and the wrist and ankle bones are long
bones. Notice that these bones are named ±or their elongated
shape,
not
their overall size. Te three bones in each o± your
fingers are long bones, even though they are small.
Short bones
are roughly cube shaped. Te bones o± the
wrist and ankle are examples (Figure 6.2d).
Sesamoid bones
(ses
9
ah-moid; “shaped like a sesame seed”) are a special type
o± short bone that ±orm in a tendon (±or example, the patella).
Tey vary in size and number in different individuals. Some
Axial skeleton
Appendicular skeleton
Hyaline cartilages
Elastic cartilages
Fibrocartilages
Cartilages
Bones of skeleton
Epiglottis
Larynx
Trachea
Cricoid
cartilage
Lung
Respiratory
tube cartilages
in neck and thorax
Thyroid
cartilage
Cartilage in
external ear
Cartilages in
nose
Articular
cartilage
of a joint
Costal
cartilage
Cartilage
in intervertebral
disc
Pubic
symphysis
Articular cartilage
of a joint
Meniscus (padlike
cartilage in
knee joint)
Figure 6.1
The bones and cartilages of the human skeleton.
The cartilages that support
the respiratory tubes and larynx are drawn separately at the right.
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