the easy way to understand our back bones

2. Introduction
 Total of bones inside our body is
33
 24 irregular bones (movable)
 Cervical
 Thoracic
 Lumbar
 9 fused bones
 Sacral & Coccygeal
 Spinal/Vertebrae column
 Structure : Atypical (C1-C2) and
Typical (C3-C7)
 Main function :
 Protection of the spinal cord
 Provides stiffening of the body
 Attachment for the pectoral and
pelvic girdles and many muscles

3. Cervical
 Cervical curvature is concave posteriorly (lordosis)
 The curvature called as secondary curvature
 Divided into two part which upper cervical region (C1,C2)
and lower cervical region (C3-C7)
 The cervical vertebrae have bifid spinous process

5. Thoracic
 Thoracic curvature is concave anteriorly (kyphosis)
 The curvature is called as primary curvatures
 Increase in size from T1-T12
 Characteristic : Small pedicles, Long spinous process, Large
intervertebral foramen & Have facet on sides of bodies

8. Lumbar
 Lumbar curvature is concave posteriorly (lordosis)
 The curvature called as secondary curvature
 Largest and strongest of t the unfused bones
 Increase in size L1-L5
 Bear much of the body’s weight
 Characteristic : Massive bodies and study laminae, Largest
of moveable vertebrae and absence of costal facet

10. Sacrum
 Sacrum curvature is concave anteriorly (kyphosis)
 The curvature is called as primary curvatures
 Triangular bone formed by the union of five sacral vertebrae
 Forms the posterior portion of the pelvis
 Articulates with L5 (superiorly) and auricular surfaces of the
hip bones to form Sacro-Illiac joint

14. Coccyx
 Coccyx curvature is concave anteriorly (kyphosis)
 The curvature is called as primary curvatures
 Called as a tailbone
 Triangular shaped
 Last portion of the vertebrae
 Normally four bones (In some cases 3-5)
 Fused vertebrae with the sacrum to form sacrococcygeal
joint