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Lecture 2

ANA300Y1 Lecture Notes - Lecture 2: Ear Canal, Wormian Bones, Foramen Magnum

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September 12th
The Skull
Landmarking - a groove or prominence on a bone that serves as a guide to the location of other
body structures
- Is formed by two sets of bones:
A) CRANIAL - encloses and protects the fragile brain tissue
B) FACIAL BONES - hold the eyes in an anterior position and allow the facial muscles to
show our feelings
- All of the bones in the skull, except for one, are joined
together by sutures (interlocking, immovable joints)
- The one exception is the jaw bone or the mandible. It
is attached to the skull by a freely movable joint
Wormian bones (aka soft spot)
- Plates of the cranium that allow it to shift during the delivery of a baby
Frontal bone
- Forms the forehead and the superior part of each eye’s orbit
Parietal bone
- Paired parietal bones from most of the superior and lateral walls of the cranium
Temporal bone
- Lie inferior to the parietal bones
Occipital bone
- The most posterior bone of the cranium. It forms the floor and back wall of the skull
Mastoid process
- A conical prominence projecting from the undersurface of the mastoid portion of the
temporal bone. It is located just behind the external acoustic meatus, and lateral to the
styloid process
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