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Questions and Answers
What is the function of the external acoustic meatus?
What is the function of the external acoustic meatus?
Which of the following bones is NOT considered a paired bone in the facial structure?
Which of the following bones is NOT considered a paired bone in the facial structure?
What part of the zygomatic bone connects with the maxilla?
What part of the zygomatic bone connects with the maxilla?
What is the primary function of the skull?
What is the primary function of the skull?
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Which bone forms the vertical partition separating the right and left nasal cavities?
Which bone forms the vertical partition separating the right and left nasal cavities?
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How many bones make up the human skull?
How many bones make up the human skull?
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Which bones make up the lateral walls of the nasal cavity?
Which bones make up the lateral walls of the nasal cavity?
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Which bone makes up the posterior part of the skull?
Which bone makes up the posterior part of the skull?
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The lacrimal bones are primarily involved in which function?
The lacrimal bones are primarily involved in which function?
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Where is the pituitary gland located?
Where is the pituitary gland located?
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What do the palatine bones contribute to in the facial structure?
What do the palatine bones contribute to in the facial structure?
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What type of nerve does the ethmoid bone transmit?
What type of nerve does the ethmoid bone transmit?
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Which feature is unique to the maxillary bones?
Which feature is unique to the maxillary bones?
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Which bones are classified as cranial bones?
Which bones are classified as cranial bones?
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What bone forms the roof of the eye sockets?
What bone forms the roof of the eye sockets?
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What structure allows the spinal cord to exit the skull?
What structure allows the spinal cord to exit the skull?
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Study Notes
Skull Anatomy
- The skull is the bony framework that supports the head.
- Its primary function is to protect the head's soft tissues, particularly the brain.
- The skull is composed of 22 bones.
- 8 bones form the cranium (brain housing).
- 14 bones form the face.
Cranial Bones
- Frontal (1): Forms the forehead and anterior part of the cranial vault, including parts of the orbits (eye sockets). Contains frontal sinuses.
- Occipital (1): Forms the posterior part of the skull, including the base and vault. The foramen magnum allows the spinal cord to exit.
- Sphenoid (1): Located centrally in the base of the skull, supporting the posterior part of the maxilla. Houses the pituitary gland (sella turcica). Contains air sinuses.
- Ethmoid (1): Located between the eyes, forming part of the nasal septum, the anterior part of the skull, medial walls of the orbits, and the roof of the nose. Contains olfactory nerve and air sinuses.
- Parietal (2): Form a large part of the cranial vault, extending from the frontal bone to the occipital bone. They meet at the sagittal suture.
- Temporal (2): Located on the sides of the head, below the parietal bones, forming part of the base. Contains the external acoustic meatus (ear canal) and organs of hearing and balance.
Facial Bones
- Maxilla (2): Forms the upper jaw and part of the palate. Intermaxillary suture connects the two halves.
- Zygomatic (2): Forms the cheekbones, parts of the lateral orbital edges, and part of the zygomatic arch.
- Nasal (2): Forms the bridge of the nose. Anterior lower part of the septum is cartilage.
- Lacrimal (2): Small bones forming part of the medial walls of the orbits; transmit the nasolacrimal duct (for tears).
- Palatine (2): Form the posterior part of the hard palate, part of the floor of the nasal cavity and part of the floor of the orbits.
- Inferior Nasal Conchae (2): Scroll-like bones in the nasal cavity, increasing surface area.
- Vomer (1): Forms the inferior part of the nasal septum.
- Mandible (1): The lower jaw bone; forms the jaw and articulates with the skull at the temporomandibular joint. This joint is the hinge connecting the jaw to the skull.
Skull Function
- Protects delicate brain tissue.
- Provides a framework for muscles of facial expression and mastication (chewing).
- Supports the head and transmits forces to the spine.
Additional Notes
- The headrest in a dental chair should support the occipital bone for proper patient positioning.
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Description
Test your knowledge on the anatomy of the skull. This quiz covers the structure and function of 22 bones that make up the skull, including both cranial and facial bones. Understand how these bones protect the brain and support facial features.
