1. Chapter 5 Axial Skeleton
Essentials of Human Anatomy & Physiology
Seventh Edition
Elaine N. Marieb
Chapter 5 Axial Skeleton
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2. The Axial Skeleton Forms the longitudinal part of the body
Divided into three parts
Skull
Vertebral column
Bony thorax
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3. The Axial Skeleton Figure 5.6
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4. The Skull Two sets of bones Bones are joined by sutures
Cranium
Facial bones
Bones are joined by sutures
Only the mandible is attached by a freely movable joint
There are eight flat bones that form the cranium. They are all single bones except for two paired bones; the parietal and the temporal bones.
There are four main sutures to remember:
Coronal Suture
Sagittal Suture
Occipital Suture
Lamdoid Suture
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5. The Skull
The temporal bone has six points of interest for you to remember:
External auditory meatus
Styloid process
Zygomatic process
Mastoid process
Jugular foramen
Carotid canal
Figure 5.7
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6. Bones of the Skull
There are fourteen bones that compose the face. Twelve are paired; the mandible and vomer are the single bones.
Figure 5.11
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7. Human Skull, Superior View
Figure 5.8
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8. Human Skull, Inferior View
Foramen Magnum is found in the occipital bone of the skull.
Figure 5.9
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9. Paranasal Sinuses
Hollow portions of bones surrounding the nasal cavity
Figure 5.10
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10. Paranasal Sinuses Functions of paranasal sinuses Lighten the skull
Give resonance and amplification to voice
Figure 5.10
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11. The Hyoid Bone
The only bone that does not articulate with another bone
Serves as a moveable base for the tongue
Remember the first bullet.
It also serves as an attachment for neck muscles responsible for moving your larynx up and down when swallowing.
Figure 5.12
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12. The Fetal Skull
The fetal skull is large compared to the infants total body length
Figure 5.13
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13. The Fetal Skull
Fontanelles – fibrous membranes connecting the cranial bones
Allow the brain to grow
Convert to bone within 24 months after birth
Figure 5.13
Slide 5.27b
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