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Questions and Answers
What area of the skull does the sphenoid bone form?
What area of the skull does the sphenoid bone form?
Part of the floor of the cranium
What are three functions of the sphenoid bone?
What are three functions of the sphenoid bone?
Unites the cranial and facial bones, strengthens the sides of the skull, mucus from the sphenoidal sinuses helps clean the surfaces of the nasal cavities
What are seven regions or markings on the sphenoid?
What are seven regions or markings on the sphenoid?
Body, sella turica, hypophyseal fossa, sphenoidal sinuses, lesser wings, greater wings, pterygoid processes
What part of the sphenoid does the body make up?
What part of the sphenoid does the body make up?
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What does the sella turica look like and where is it located on the sphenoid bone?
What does the sella turica look like and where is it located on the sphenoid bone?
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What is the name of the depression found in the sella turica?
What is the name of the depression found in the sella turica?
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What is found within the hypophyseal fossa?
What is found within the hypophyseal fossa?
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Where are the sphenoidal sinuses found in the sphenoid bone?
Where are the sphenoidal sinuses found in the sphenoid bone?
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Where are the lesser wings of the sphenoid found?
Where are the lesser wings of the sphenoid found?
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Where are the greater wings of the sphenoid found?
Where are the greater wings of the sphenoid found?
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What is the name of the marking found on the greater wing of the sphenoid?
What is the name of the marking found on the greater wing of the sphenoid?
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What do the pterygoid processes look like and where are they located on the sphenoid bone?
What do the pterygoid processes look like and where are they located on the sphenoid bone?
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What is the name of the structures found on the pterygoid process?
What is the name of the structures found on the pterygoid process?
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What is the function of the pterygoid plates?
What is the function of the pterygoid plates?
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What are the names of the seven foramens that pass through the sphenoid bone?
What are the names of the seven foramens that pass through the sphenoid bone?
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What structure is found within the foramen rotundum?
What structure is found within the foramen rotundum?
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What two structures pass through the optic canals?
What two structures pass through the optic canals?
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What are the four structures that pass through the superior orbital fissure?
What are the four structures that pass through the superior orbital fissure?
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What structure is found within the foramen ovale?
What structure is found within the foramen ovale?
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What structure is found within the foramen spinosum?
What structure is found within the foramen spinosum?
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Study Notes
Sphenoid Bone Overview
- Forms part of the floor of the cranium, providing structural support.
- Acts as a connector between cranial and facial bones.
Functions of the Sphenoid Bone
- Strengthens sides of the skull to enhance stability.
- Sphenoidal sinuses produce mucus that aids in cleaning nasal cavity surfaces.
Regions and Markings of the Sphenoid
- Comprises various key regions: body, sella turica, hypophyseal fossa, sphenoidal sinuses, lesser wings, greater wings, and pterygoid processes.
Body and Structure
- Central axis of the sphenoid bone is known as the body.
Sella Turica
- A saddle-shaped bony structure located superiorly on the body of the sphenoid.
Hypophyseal Fossa
- Depression within the sella turica that houses the pituitary gland.
Sphenoidal Sinuses
- Located on either side of the body, below the sella turica, these sinuses contribute to mucous drainage.
Lesser Wings
- Extend horizontally anterior to the sella turica, contributing to the overall shape of the sphenoid.
Greater Wings
- Project laterally from the body, forming part of the cranial floor.
Markings on Greater Wing
- Contains the sphenoidal spine, a specific protrusion.
Pterygoid Processes
- Feature vertical projections on either side of the body which assist in muscle attachment.
Pterygoid Plates
- Comprise medial and lateral plates, serving as muscle attachment points that enable movement of the mandible and soft palate.
foramens of the Sphenoid
- Seven foramens traverse the sphenoid bone: optic canals, superior orbital fissure, inferior orbital fissure, foramen lacerum, foramen rotundum, foramen ovale, and foramen spinosum.
Structures Passing Through Foramens
- Foramen rotundum contains the maxillary branch of the trigeminal nerve.
- Optic canals house the optic nerve and ophthalmic artery.
- Superior orbital fissure carries the oculomotor nerve, trochlear nerve, trigeminal nerve, and abducens nerve.
- Foramen ovale accommodates the mandibular branch of the trigeminal nerve.
- Foramen spinosum allows blood vessels to the membranes surrounding the central nervous system.
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Description
Test your knowledge on the sphenoid bone with these flashcards. Learn about its location, functions, and important markings. Ideal for students studying anatomy or preparing for exams.
