Anatomy LE 3: Ears, Nose, Paranasal Sinuses

Where is the ethmoidal sinus located?

Between the nasal cavity and orbit

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

Before age 2

How many groups of ethmoidal cells are there?

3 groups

Where does the anterior ethmoidal sinus drain into?

Middle Meatus Signup and view all the answers

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

A thin plate of bone Signup and view all the answers

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

To avoid creating a fistula Signup and view all the answers

Where is the frontal sinus located?

Between the inner and outer tables of the frontal bone Signup and view all the answers

At what age is the frontal sinus detectable?

At age 7 Signup and view all the answers

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

To filter particles from inspired air Signup and view all the answers

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

Pseudostratified Ciliated Columnar Epithelium Without Goblet cells Signup and view all the answers

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

Respiratory region Signup and view all the answers

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

Submandibular gland Signup and view all the answers

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

Choanae Signup and view all the answers

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

Pseudostratified Ciliated Columnar Epithelium With Goblet cells Signup and view all the answers

What is the main function of the nasal cavity?

To filter, warm, and humidify the air we breathe Signup and view all the answers

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

Vibrissae Signup and view all the answers

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

Excessive acuteness of hearing Signup and view all the answers

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

Facial nerve Signup and view all the answers

What is the location of the pterygoid plexus?

In the infratemporal fossa Signup and view all the answers

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

Branches of the maxillary artery Signup and view all the answers

Where does the superior petrosal sinus drain into?

Into the sigmoid sinus Signup and view all the answers

What is the composition of the tympanic plexus?

Tympanic branch of CN IX and sympathetic fibers Signup and view all the answers

Which artery supplies the tympanic branches?

Maxillary artery Signup and view all the answers

What is the location of the tympanic plexus?

On the surface of the promontory Signup and view all the answers

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

Convert sound stimuli into nervous impulses Signup and view all the answers

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

Embedded with the tips of stereocilia of Outer Hair Cells Signup and view all the answers

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

Amplify sound frequencies Signup and view all the answers

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

Support the Inner Tunnel Signup and view all the answers

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

Plays a role in sound transmission Signup and view all the answers

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

Three rows Signup and view all the answers

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

Detects sound vibrations of different frequencies Signup and view all the answers

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

Support the basolateral parts of both Inner and Outer Hair Cells Signup and view all the answers

Where is the Macula Utriculi located?

On the floor of the utricle Signup and view all the answers

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

To produce a gelatinous layer and otoliths Signup and view all the answers

What is the cupula in the crista ampullares?

A dome-shaped layer of proteoglycans Signup and view all the answers

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

To detect gravity Signup and view all the answers

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

Location Signup and view all the answers

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

Axons and dendrites Signup and view all the answers

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

30-50 stereocilia and 1 long kinocilium Signup and view all the answers

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

To detect gravity and maintain balance Signup and view all the answers

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

They have similar histological structure Signup and view all the answers