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Exam 2-Ear
Ear
12
Anatomy
Graduate
08/07/2011

Additional Anatomy Flashcards

 


 

Cards

Term

External Ear

 

auricle

Definition

Auricle - irregular flap of cartilage, equipped w/ vestigial mm.(innervated by CN7) surrounding ext. auditory meatus

 

-Parts: tragus helix, lobule

Term

External Ear

 

External Auditory Meatus

Definition

-bounded medially by tympanic membrane

 

-Bony and cartilaginous wall

 

-Tympanic membrane: 2 Epithelial layers

Term

Innervation of external ear

 

Auricle 

Definition

-Great auricular n. (cervical plexus) 

 

-Lesser occipital n. (cervical plexus)

 

-Auriculotemporal n (CN V3)

Term

Innervation of external ear

 

meatus and tympanic membrane 

Definition

-auriculotemporal n (CN V3)

 

-Vagus n (CN X)

 

-Possibly CN 7 and 9

Term

Middle Ear

 

Overview

Definition

-Within temporal bone

-Energy of sound wave is converted into mech. energy through a chain of ossicles.

-Consists of tympanic cavity and contents

-Continuous ant. w auditory tube and post. w mastoid air cells

Term

Tympanic Cavity Boundaries 

 

Roof, Floor, Lateral wall

 

Definition

-Roof: tegmen typmani 

-Floor: Jugular wall(tympanic n)

-Lateral wall: tympanic membrane 

-Anterior (carotid) wall: 

1.opening of auditory tube

2.tensor tympani muscle

3.internal carotid artery

 

Term

Tympanic Cavity Bourndaries

 

Posterior wall, medial wall

Definition

-Posterior wall: -aditus to mastoid air cells

-Stapedius M.

-Facial canal

 

-Medial wall:-oval window(fenestra vestibuli)

-Round Window(Fenestra cochleae)

-Promontory(tympanic plexus)

 

Term

Contents of Tympanic Cavity

 

Definition

Ossicles:-malleus-attached to tympanic membrane

-incus-intermediate

-stapes- attached to oval window

Muscles: -Tensor tympani m (CNV3)

-stapedius m- (CNVII)

Chorda tympani n. (runs across tympanic mem)

Term

Contents of tympanic cavity 

cont. 

Definition

Neurovascular supply:

innervation-tympanic plexus(CN9)

Blood Supply-tympanic branches of maxillary and adjacent aa.

 

Aditus: opens to mastoid air cells

 

Auditory tube: opens to nasopharynx, equalizes air pressure in middle ear

Term
Inner Ear Contents
Definition

Vestibule: central, communicates:

-laterally w middle ear by oval window

-anteriorly w chochlea

-post. w semicircular canals

Chochlea: anterior, responsible for audition.

-round window opens from it

Semicircular canals: superior and lateral to vestibule, responsible for balance

Term

Vestibulocochlear n

CN8

Definition

Special sensory fibers only

-cochlear n(hearing)

-vestibular n.(equilibrium)

 

Exits cranial cavity through internal auditory meatus

Term
Facial N in temporal bone
Definition

-Internal auditory meatus

-facial canal

-Facial nerve branches

1.Geniculate ganglion(sensory only)

2.Greater petrosal nerve

3.Nerve to stapedius

4. Chorda tympani n

 

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