Anatomy and Physiology: Skull Bones Lecture

Overview

• The skull consists of 22 bones, part of the axial skeleton.
• These bones are divided into:
  • 8 Cranial Bones
  • 14 Facial Bones
• Connected by jagged suture joints.

Cranial Bones

• General Overview:
  • Single bones except for 2 pairs.

Paired Cranial Bones

1. Parietal Bones
   • Make up side walls of the cranium.
   • "Parietal" means "wall".
2. Temporal Bones
   • Located inferior to the parietal bones.
   • Associated with the temple area.

Single Cranial Bones

3. Frontal Bone
   • Covers the frontal lobe; forms the forehead.
   • Easy to remember: "Forehead" and "Frontal" both start with F.
4. Sphenoid Bone
   • Butterfly-shaped; articulates with all cranial bones.
   • Spans the entire width of the cranium.
   • Appears paired from lateral view but isn’t.
5. Ethmoid Bone
   • Located between the sphenoid and nasal bones.
   • Has cribriform plates, resembling a strainer.
6. Occipital Bone
   • Located at the back of the head; covers the occipital lobe.
   • Processes visual images.

Mnemonic for Cranial Bones

• "Ethan’s Fried Spanish Pasta Tempted Octavia"

Facial Bones

• General Overview:
  • Paired bones except for 2 single bones.

Single Facial Bones

1. Mandible
   • Jawbone; strongest facial bone.
   • Associated with a "chiseled jawline".
2. Vomer
   • Forms inferior part of nasal septum.
   • Name derived from "plowshare".

Paired Facial Bones

3. Nasal Bones
   • Form the bridge of the nose.
4. Inferior Nasal Conchae
   • Shell-shaped; located in lower part of the nose.
5. Lacrimal Bones
   • Located near tear ducts; associated with "lacrimal fluid" (tears).
6. Palatine Bones
   • Make up the posterior part of the hard palate.
7. Zygomatic Bones
   • Known as the cheekbones.
8. Maxilla (Maxillary Bones)
   • Form the maximum area of the face; articulate with most facial bones.

Mnemonic for Facial Bones

• "My Mouth’s Palate But Never Like Zucchini In Vinegar"

Associated Bones

• Hyoid Bone: U-shaped bone, aids in swallowing.
• Auditory Ossicles: Three ear bones (malleus, incus, stapes) known as hammer, anvil, and stirrup.

Additional Resources

• Free Quiz: Available on the RegisteredNurseRN.com website.
• Further Learning: More anatomy videos and future topics include cranial sutures and landmarks.

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