This presentation is for the Grade 4 teachers Unit 1to help them the class more interesting with the use of technology

1. Science
IV
Parts of the Skeletal
System
Prepare by:
Sir. Lito

2. What are Bones?
 Bones are made up
of bone cells and
tissues
 Hard, dense and
smooth outer
materials, which
are made of
calcium, give bones
there shape and
strength.

3. Parts of the Bone

4. Bone Growth
Endochondral ossification begins with points
in the cartilage called "primary ossification
centers." They mostly appear during fetal
development, though a few short bones begin their
primary ossification after birth.

5. Two main divisions of the Skeletal
System
*Axial Skeleton - consists of the 80 bones along the
central axis of the human body. It is composed of
six parts; the human skull, the ossicles of the
middle ear, the hyoid bone of the throat, the
rib cage, sternum and the vertebral column. The
axial skeleton and the appendicular skeleton
together form the complete skeleton.
*Appendicular Skeleton - composed of 126 bones in
the human body. The word appendicular is the
adjective of the noun appendage, which itself
means a part that is joined to something larger.

6. The members of the axial skeleton
group
 Skull
 Vertebral
Column
 Rib Cage
 Hyoid Bone

7. Skull
Skull is made of
29 tightly joined
bones. It is also
called cranium. It
protects the brain,
eyes, nose and ears.

8. Vertebral Column
The vertebral
column is also
called the
backbone. It is
found in the middle
of the human trunk.
It has small bones
called vertebrae or
vertebras, which
protects the spinal
cord.

9. Rib Cage
The rib cage are
made up of 25
bones. The straight
bone in the center is
the sternum also
called as breastbone
to which the ribs
attached.

10. Hyoid Bone
The hyoid bone
(lingual bone) (Latin
os hyoideum) is a
horseshoe-shaped bone
situated in the anterior
midline of the neck
between the chin and
the thyroid cartilage.
At rest, it lies at the
level of the base of the
mandible in the front
and the third
cervical vertebra
behind.

11. The members of the appendicular
skeleton group
 Pectoral girdle
 Pelvic Girdle
 Forelimb
 Hind Limb

12. The pectoral girdle
The pectoral
girdle is made of
the clavicle or
collarbones and
two shoulder
bones or shoulder
blades.
Collarbones run
from shoulder to
shoulder.

13. The pelvic girdle
The pelvic
girdle is made
up of two hip
bones

14. The forelimb
The Forelimb
is made of the
upper and lower
arm bones, the
wrist bone, the
palm bones, and
the finger bones.

15. The Hind Limb
The hind limb
is made of the
thigh bone, the
kneecap, the
shank bone, the
ankle bone, the
bones of the sole,
and the toe bones.