200
UNIT 2
Covering, Support, and Movement of the Body
7
body, (2) supports the head, neck, and trunk, and (3) protects
the brain, spinal cord, and the organs in the thorax. As we will
see later in this chapter, the bones of the appendicular skeleton,
which allow us to interact with and manipulate our environment,
are appended to the axial skeleton.
As described in Chapter 6, the skeleton is divided into
axial
and
appendicular
portions (see Figures 6.1 and 7.1). Te
axial
skel-
eton
is structured from 80 bones segregated into three major re-
gions: the
skull
,
vertebral column
, and
thoracic cage
(Figure 7.1)
.
Tis part of the skeleton (1) forms the longitudinal axis of the
Skull
Thoracic cage
(ribs and
sternum)
(a) Anterior view
(b) Posterior view
Facial bones
Cranium
Sacrum
Vertebral
column
Clavicle
Bones of
pectoral
girdle
Bones
of
pelvic
girdle
Upper
limb
Scapula
Sternum
Rib
Humerus
Vertebra
Radius
Ulna
Carpals
Phalanges
Metacarpals
Femur
Patella
Lower
limb
Tibia
Fibula
Tarsals
Metatarsals
Phalanges
Figure 7.1
The human skeleton.
Bones of the axial skeleton are colored green. Bones of the
appendicular skeleton are gold.
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