Questions and Answers
Which bones create the greater part of the cranium?
The ____ creates the greater part of the cranium.
two parietal bones
What forms the superior portion of the sides and back of the cranium?
the parietal bones
What are the two parietal bones marked by near their center?
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The widest part of the cranium is measured between the ________?
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Which bones create the lower portion of the sides and base of the cranium?
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The ___________ create the lower portion of the sides and base of the cranium?
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What is the vertical portion of the temporal bone?
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What projects from the lower part of the squama?
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The ___________ projects from the lower part of the squama?
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The ______________ is the opening of the ear passage?
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What is a small oval depression on the under-surface of the temporal bone?
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The _______________ is a small oval depression on the under-surface of the temporal bone.
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What acts as a hinge for the lower jaw?
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The lowest part of the back of the skull is what?
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What is the large opening in the occipital bone that permits entry of the spinal cord?
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The ____________ means the back or posterior part of the head or skull?
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What is described as the bat or butterfly-shaped bone?
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The landmark of the sphenoid bone is the ________?
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What bone in the skull separates the nasal cavity from the brain?
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__________ lies above the medial ends of the eyebrows?
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What is often described as the eminence just above the root of the nose?
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Which suture joins the frontal bone with each parietal bone?
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Study Notes
Parietal Bones
- Comprise two bones forming the superior part of the cranium.
- Articulate with temporal, occipital, and frontal bones.
- Parietal eminence marks the widest part of the cranium.
Temporal Bones
- Two bones create the lower sides and base of the cranium.
- Positioned inferior to parietal bones and anterior to occipital bone.
- Squama is a vertical, thin, translucent part of the temporal bone.
Zygomatic Arch
- Projects from the lower squama, long and arched.
- Establishes the widest part of the face and aids in ear reconstruction.
External Auditory Meatus
- Opening of the ear passage, aligning with the front border of the ear.
- Key for accurate reconstruction of the ear position.
Mandibular Fossa
- Small oval depression under the temporal bone, posterior to the zygomatic arch.
- Hinge for the lower jaw, where the lower jaw condyle fits.
- Dislocation may correct "buck teeth."
Mastoid Process
- Located under the ear lobe, part of the temporal bone.
- Functions as a hinge for the lower jaw.
Frontal Bone
- One bone forming the forehead and anterior roof of the skull.
- Vertical section extends from eye sockets to frontal eminences.
Supraorbital Margin
- Forms the upper rim of the eye socket, situated below the superciliary arches.
Superciliary Arches
- Located above the medial ends of eyebrows and on the forehead's lower area.
Glabella
- Smooth elevation between superciliary arches, found above the nose's root.
Occipital Bone
- Lowest part of the skull's back and base, cradling the brain.
Foramen Magnum
- Large opening in the occipital bone for the spinal cord's entry.
Occipital Protuberance
- Eminence felt through the scalp, aids in locating the foramen magnum.
Sphenoid Bone
- Bat-shaped bone contributing to the cranial cavity, eye orbits, and temple area.
- Sella turcica cradles the pituitary gland.
Ethmoid Bone
- Separates nasal cavity from the brain, lightweight and irregularly shaped.
- Forms part of the eye orbit.
Crista Galli
- Known as the "crest of the cock," a feature of the ethmoid bone.
Cribriform Plate
- Superior surface of the ethmoid bone, part of the cranial cavity floor with many small holes.
Perpendicular Plate
- Thin bone plate in the nasal cavity, part of the septum structure.
Cranial Sutures
- Squamosal: Joins parietal and temporal bones.
- Lambdoidal: Joins parietal and occipital bones.
- Coronal: Joins frontal and parietal bones.
- Sagittal: Joins the two parietal bones.
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Description
This quiz covers the anatomy of key cranial bones, including the parietal, temporal, and zygomatic bones. You will explore their locations, functions, and relationships to other structures in the skull. Perfect for students studying human anatomy or related fields.
