Skeletal System 1/10/13
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Describe the skeletal system
1. The skeleton is a solid, movable framework that supports the body
2. Bones work as levers to anchor plates to allow for movement
3. Bones also work for other body systems
4. The body draws from mineral stores in bones during times of shortage
Name the components of the skeletal system
Name the parts of the Axial Skeleton
- Hyoid bone
- (superior to inferior)
Name the parts of the appendicular skeleton
How many vertebrae and divisions in the vertebral column?
- 33 vertebrae in 5 divisions
- Each vertebra has a letter and a number designation
Name the 5 divisions of the vertebral column
- Cervical vertebrae (C1-C7)
- Thoracic vertebrae (T1-T12)
- Lumbar vertebrae (L1-L5)
- Sacral vertebrae (S1-S5) fused into sacrum
- Coccygeal vertebare (4) fused into coccyx
The higher up the injury, the more you lose.
C1 - C7
- C1 = atlas supports the skull for rotation
- C2 = axis allows the skull to pivot
- It has:
- Spinous Processes except C1 and C2-rudimentary spinous process
- Transverse Processes
- Transverse foramina are present only in the cervical vertebrae
- Vertebral foramen
- Intervertral foramina
- Superior articular facet
- Inferior articular facet
Basis for respiratory framework
Form the posterior point of attachment for the ribs of the body thorax
Correspond to each pair of ribs
Between the vertebrae are the intervertebral foramina which are formed by the inferior and superior notches of articulating vertebrae.
Superior/inferior costal facets
Larger spinous and transverse processes
Spinal cord ends in the lumbar
Larger muscle attachments - bigger body (corpus) walking, lifting.
Provide direct or indirect attachment for many of the back and abdominal muscles and posterior fibers of the diaphragm
Transverse spinous processes smaller
What are the primary and secondary curves?
- develop in the womb
- cervical-develops when the infant begins to lift his/her head
lumbar-develops when the child begins to stand and walk
What are the components of the pectoral girdle?
Supports the upper extremities.
What are the components of the pelvic girdle?
Supports the lower extremities.
Lower extremities attach to AXIS by means of pelvic girdle.
- Sacrum (is not part of the appendicular skeleton)
- Pubic bone
Disorders of the skeletal system
bone and joint disorders
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