Anatomy LE 3: Ears, Nose, Paranasal Sinuses
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Questions and Answers

Where is the ethmoidal sinus located?

  • Between the nasal bone and maxillary sinus
  • Between the frontal bone and nasal cavity
  • Between the maxillary sinus and frontal bone
  • Between the nasal cavity and orbit (correct)

    • At what age is the ethmoidal sinus recognizable in a CT scan?

  • Before age 1
  • At birth
  • After age 3
  • Before age 2 (correct)

    • How many groups of ethmoidal cells are there?

  • 8-10 groups
  • 5-7 groups
  • 3 groups (correct)
  • 2-4 groups

    • Where does the anterior ethmoidal sinus drain into?

    <p>Middle Meatus</p> Signup and view all the answers

    What separates the maxillary sinus and the roots of maxillary molar teeth?

    <p>A thin plate of bone</p> Signup and view all the answers

    Why is proper technique and precaution necessary when removing a molar tooth with dental caries?

    <p>To avoid creating a fistula</p> Signup and view all the answers

    Where is the frontal sinus located?

    <p>Between the inner and outer tables of the frontal bone</p> Signup and view all the answers

    At what age is the frontal sinus detectable?

    <p>At age 7</p> Signup and view all the answers

    What is the main function of the vibrissae in the nasal cavity?

    <p>To filter particles from inspired air</p> Signup and view all the answers

    What is the name of the epithelium that lines the olfactory region of the nasal cavity?

    <p>Pseudostratified Ciliated Columnar Epithelium Without Goblet cells</p> Signup and view all the answers

    What is the name of the region that makes up the inferior ⅔ of the nasal cavity proper?

    <p>Respiratory region</p> Signup and view all the answers

    What is the main drainage site for the upper lip and lateral lower lip?

    <p>Submandibular gland</p> Signup and view all the answers

    What is the term for the posterior nasal opening or apertures?

    <p>Choanae</p> Signup and view all the answers

    What is the name of the epithelium that lines the respiratory region of the nasal cavity?

    <p>Pseudostratified Ciliated Columnar Epithelium With Goblet cells</p> Signup and view all the answers

    What is the main function of the nasal cavity?

    <p>To filter, warm, and humidify the air we breathe</p> Signup and view all the answers

    What is the term for the short, stiff hairs that are found in the nasal cavity?

    <p>Vibrissae</p> Signup and view all the answers

    What is the result of a lesion involving the facial nerve?

    <p>Excessive acuteness of hearing</p> Signup and view all the answers

    Which nerve is responsible for the paralysis of the stapedius muscle in hyperacusis?

    <p>Facial nerve</p> Signup and view all the answers

    What is the location of the pterygoid plexus?

    <p>In the infratemporal fossa</p> Signup and view all the answers

    What is the origin of the tributaries of the pterygoid plexus?

    <p>Branches of the maxillary artery</p> Signup and view all the answers

    Where does the superior petrosal sinus drain into?

    <p>Into the sigmoid sinus</p> Signup and view all the answers

    What is the composition of the tympanic plexus?

    <p>Tympanic branch of CN IX and sympathetic fibers</p> Signup and view all the answers

    Which artery supplies the tympanic branches?

    <p>Maxillary artery</p> Signup and view all the answers

    What is the location of the tympanic plexus?

    <p>On the surface of the promontory</p> Signup and view all the answers

    What is the function of the Inner Hair Cells in the Organ of Corti?

    <p>Convert sound stimuli into nervous impulses</p> Signup and view all the answers

    What is the role of the Tectorial Membrane in the Organ of Corti?

    <p>Embedded with the tips of stereocilia of Outer Hair Cells</p> Signup and view all the answers

    What is the function of the Outer Hair Cells in the Organ of Corti?

    <p>Amplify sound frequencies</p> Signup and view all the answers

    What is the role of the Pillar Cells in the Organ of Corti?

    <p>Support the Inner Tunnel</p> Signup and view all the answers

    What is the function of the Inner Tunnel in the Organ of Corti?

    <p>Plays a role in sound transmission</p> Signup and view all the answers

    How many rows of stereocilia are present in Outer Hair Cells near the saccule?

    <p>Three rows</p> Signup and view all the answers

    What is the function of the Basilar Membrane in the Organ of Corti?

    <p>Detects sound vibrations of different frequencies</p> Signup and view all the answers

    What is the role of the Inner and Outer Phalangeal Cells in the Organ of Corti?

    <p>Support the basolateral parts of both Inner and Outer Hair Cells</p> Signup and view all the answers

    Where is the Macula Utriculi located?

    <p>On the floor of the utricle</p> Signup and view all the answers

    What is the function of the supporting cells in the macula utriculi and macula sacculi?

    <p>To produce a gelatinous layer and otoliths</p> Signup and view all the answers

    What is the cupula in the crista ampullares?

    <p>A dome-shaped layer of proteoglycans</p> Signup and view all the answers

    What is the purpose of the otoliths or otoconia in the macula utriculi and macula sacculi?

    <p>To detect gravity</p> Signup and view all the answers

    What is the difference between the macula utriculi and macula sacculi?

    <p>Location</p> Signup and view all the answers

    What do the receptor cells in the macula utriculi and macula sacculi consist of?

    <p>Axons and dendrites</p> Signup and view all the answers

    How many stereocilia and kinocilium do the receptor cells in the macula utriculi and macula sacculi have?

    <p>30-50 stereocilia and 1 long kinocilium</p> Signup and view all the answers

    What is the function of the receptor cells in the macula utriculi and macula sacculi?

    <p>To detect gravity and maintain balance</p> Signup and view all the answers

    What is the histological similarity between the macula utriculi and macula sacculi, and the crista ampullares?

    <p>They have similar histological structure</p> Signup and view all the answers

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