Axial skeleton lesson

●The skeleton, composed of bones,
cartilages, joints, and ligaments, accounts
for about 20% of body mass.

●There are 206 bones in the human body.

● The axial

skeleton forms
the long axis of
the body and
includes the
bones of the
skull, vertebral
column, and rib
cage.

● There are 80

bones in the
axial skeleton.

● The Appendicular

skeleton consists of
the bones of the
upper and lower
limbs, and the
shoulder bones and
hip bones.

● There are 126 bones

in the Appendicular
Skeleton.

● The skull consists of two sets of bones – the

cranium and the facial bones. There are
eight cranial bones and fourteen facial
bones.

● The joints between bones of the skull are

immovable and called sutures.

The Cranial Bones of the Skull

● The Cranial Bones

– Occipital bone

– Parietal bones

– Frontal bone

– Temporal bones

– Sphenoid

– Ethmoid

The Skull

The Adult Skull

The Skull

The Adult Skull

●Fetal Skull -

fontanels

The Skull

The Adult Skull

The Skull

● Superficial Facial Bones

– Maxillae/Mandible = maxillary bones

– Lacrimal

– Nasal

– Zygomatic

– Mandible

The Skull
● Cranial Bones

– Enclose the cranial cavity

– Which contains the brain

● And its fluids, blood vessels, nerves, and membranes

● Facial Bones

– Superficial facial bones

● For muscle attachment

– Deep facial bones

● Separate the oral and nasal cavities

● Form the nasal septum

The Skull

Cranial and Facial Subdivisions of the Skull

The Skull

The Adult Skull

The Skull

The Adult Skull

The Skull

The Sectional Anatomy of the Skull.

The Skull

The Sectional Anatomy of the Skull