▪ Cranial Bones: “cranial cavity – encloses and protects the brain” (8)
- Protects the brain and houses the ear ossicles.
- Muscle attachment for jaw, neck, and facial muscles.
➢ Frontal bone:
- Anterior portion of the cranium, the roofs of orbits (eye sockets), and most of the
anterior part of the cranial floor + frontal sinus.
- In most individuals, the frontal bone is UNPAIRED.
- After birth, the left and right sides of the frontal bone are united by the metopic
suture, which disappears between 6 and 8.
➢ 2 Parietal bones:
- The sides and the roof of the cranial cavity.
- Quadrilateral (4-sided) bones
- Each bone articulates with five other bones.
➢ 2 Temporal bones:
- Zygomatic process that projects anteriorly from the inferior portion of the temporal
squama forms part of the arch, articulating (forming a joint) with the temporal
process of the zygomatic (cheek) bone.
- External auditory meatus – ear canal; directs sound waves into the ear.
- Mastoid Process – a rounded projection of the mastoid portion of the temporal
bone posterior and inferior to the external auditory meatus that serves as a point of
attachment for several neck muscles.
- Mandibular fossa (TMJ) – the mandibular fossa and the articular tubercle articulate
with the mandible to form TMJ (temporomandibular joint).