Skeletal System Anatomy
The skeletal system in an adult body is made up of 206 individual bones. These bones are
arranged into two major divisions: the axial skeleton and the appendicular skeleton.
Human vertebral column
There are normally thirty-three (33) vertebrae in humans, including
฀ cervical (7 vertebrae),
฀ thoracic (12 vertebrae)
฀ lumbar (5 vertebrae)
฀ five that are fused to form the sacrum
฀ four that are fused to form coccygeal bones
Joints: The place where two bones meet is
called a joint. Including:
฀ Ball & Socket (shoulders & hips)
฀ Hinge (knee & elbow)
฀ Saddle (thumb or phalanges )
฀ Ellipsoid (Carpus)
฀ Pivot (neck)
฀ Gliding (tarsals / metatarsals)
Skull
28 irregular shaped bones form the skull, the skull consists of three major division:
Eight bones form cranium.
Fourteen bones form face.
Six bone form auditory ossicles.
Cranium: its consist of 8 bones
Frontal (1)
Parietal (2)
Temporal (2)
Sphenoid (1)
Ethmoid (1)
Occipital (1)
Facial bones: its consist of 14 bones
Nasal (2)
Maxillae (2)
Lacrimal (2)
Zygomatic (2)
Palatines (2)
Conchae (2)
Vomer (1)
Mandible (1)
auditory ossicles: it consist of 6 bones
1. Incus (2)
2. Malleus (2)
3. Stapes (2)
Sutures
There are four Immovable joints
called sutures form boundaries
between skull bones:
• Coronal : between (frontal and
parietal bones)
• Sagittal :between (parietal bones)
• Lambdoidal :between (Occipital
and parietal bones)
• Squamous : between (Temporal
and parietal bones)