Anatomy of the Nasal Cavity

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Questions and Answers

What forms the floor of the orbital cavity?

  • Body of the sphenoid
  • Orbital plate of the maxilla (correct)
  • Frontal process of maxilla
  • Orbital plate of the ethmoid

Which structures contribute to the roof of the nasal cavity?

  • Lacrimal and ethmoid bones
  • Frontal and nasal bones (correct)
  • Maxilla and zygomatic bone
  • Body of the sphenoid and maxilla

What primarily makes up the medial wall of the nasal cavity?

  • Vomer and sphenoid
  • Perpendicular plate of the ethmoid and vomer (correct)
  • Perpendicular plate of palatine bone and maxilla
  • Frontal process of the maxilla and lacrimal bone

What do the facial muscles surround?

<p>Facial openings (C)</p> Signup and view all the answers

Which part of the nasal cavity is separated by the nasal septum?

<p>Right and left halves (B)</p> Signup and view all the answers

What structure is located midway between the upper and lower borders of the mandibular body?

<p>Mental foramen (D)</p> Signup and view all the answers

Which tubercle is associated with the mental protuberance?

<p>Mental tubercle (C)</p> Signup and view all the answers

What feature of the ramus runs obliquely downward and forward?

<p>Mylohyoid groove (C)</p> Signup and view all the answers

Which process is located in front of the mandibular notch?

<p>Coronoid process (C)</p> Signup and view all the answers

What is the term for the pair of spines near the lower part of the symphysis?

<p>Genial tubercles (D)</p> Signup and view all the answers

What does the superior or alveolar border of the mandible primarily accommodate?

<p>Teeth (C)</p> Signup and view all the answers

Which fossa is an oval depression located below the mental spines?

<p>Digastric fossa (A)</p> Signup and view all the answers

How many paranasal sinuses are there?

<p>Four (C)</p> Signup and view all the answers

What is the function of the paranasal sinuses?

<p>Act as air conditioning (C)</p> Signup and view all the answers

Which sinus is located below the orbit?

<p>Maxillary sinus (A)</p> Signup and view all the answers

Where does the sphenoidal sinus open?

<p>Into the nasal cavity (A)</p> Signup and view all the answers

Which wall of the maxillary sinus is shared with the inferior wall of the orbit?

<p>The roof (A)</p> Signup and view all the answers

What forms the roof of the orbit?

<p>Frontal bone (C)</p> Signup and view all the answers

What is the primary shape of the orbit?

<p>Pyramidal (B)</p> Signup and view all the answers

Which structures border the maxillary sinus?

<p>Maxilla and zygomatic bone (C)</p> Signup and view all the answers

What is the medial margin of the orbit formed by?

<p>Maxilla and frontal bone (C)</p> Signup and view all the answers

Flashcards

Symphysis

The midline fusion of two mandibular bones, creating the lower jaw's central portion.

Mandibular Body

The main portion of the lower jaw bone, horseshoe shaped, with surfaces and borders.

Mental Foramen

An opening in the mandibular body allowing nerves and blood vessels to pass to the chin area.

Ramus

A perpendicular portion of the mandible, extending upward and backward from the body.

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Mandibular Foramen

Opening in the ramus where the inferior alveolar nerve and blood vessels pass.

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Condyloid Process

The posterior projection of the mandible, articulating with the skull's temporal bone.

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Alveolar Border

The upper border of the mandible, containing sockets for the teeth.

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Mental Tubercle

A rounded prominence below the symphysis(middle part of the mandibular body).

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Mylohyoid Line

A curved lower border lining of the mandibular body, where a muscle attaches.

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Paranasal Sinuses

Four air-filled spaces in the skull near the nasal cavity.

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Orbital Floor

The bottom of the eye socket, formed by the maxilla and separating the eye socket from the maxillary sinus

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Nasal Cavity Medial Wall

Centre wall of the nose, formed by the perpendicular plate of the ethmoid and vomer, and septal cartilage

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Nasal Cavity Roof

The top of the nasal cavity, with three parts: frontal/nasal bones, cribriform plate of ethmoid, and sphenoid body.

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Nasal Cavity Floor

The bottom of the nasal cavity, which is formed by the bony palate

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Nasal Cavity Lateral Wall

The side wall of the nasal cavity, made up of maxilla, perpendicular plate of palatine bone, and ethmoidal labyrinth.

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Facial Muscles

Muscles under the skin of the face and scalp, positioned for mouth, eye, nose, and ear.

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Nasal Cavity

The space inside your nose, divided in two parts by the nasal septum, that connects with the outside and the throat.

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Paranasal sinuses

Air-filled cavities within skull bones, lined with mucous membrane, connected to nasal cavity, decreasing head weight, and acting as voice/air-conditioning boxes.

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Maxillary sinus

Largest paranasal sinus in the maxilla, below the orbit, opening into middle nasal meatus, connected to nasal cavity via maxillary ostium.

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Sphenoidal sinus

Paranasal sinus located within sphenoid bone, below hypophyseal fossa, opening into nasal cavity.

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Frontal sinus

Paranasal sinus in frontal bone, above orbit and nose, opening into nasal cavity.

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Ethmoidal sinus

Paranasal sinus between nasal cavity and orbit, opening into nasal cavity.

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Maxillary sinus roof

Thin bony plate shared with the inferior wall of the orbit.

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Maxillary sinus floor

Composed of alveolar process of maxilla, and includes elevations for teeth roots. Potential infection pathway during dental procedures.

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Orbital margin

Surrounding edge of the eye socket; formed by various skull bones (frontal, zygomatic, maxilla).

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Orbital cavity

Pyramidal cavity, base towards front, apex to rear.

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Orbital roof

Formed by orbital plate of frontal bone; separates orbital cavity from anterior cranial fossa.

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Orbital lateral wall

Formed by zygomatic bone and greater wing of sphenoid bone.

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