Podcast
Questions and Answers
What is the main function of the outer ear?
What is the main function of the outer ear?
- Amplify sound frequencies
- Filter out background noise
- Convert sound waves into electrical signals
- Transmit sounds from external environment to the middle ear (correct)
Which structure is NOT part of the auricular pavilion?
Which structure is NOT part of the auricular pavilion?
- Tragus
- Concha of the ear
- Antitragus
- Cochlea (correct)
What is the origin of the Auricular Superior muscle?
What is the origin of the Auricular Superior muscle?
- Fosa Temporal (correct)
- Mandible
- Galea Aponeurótica
- Arco Cigomático
Which nerve innervates the extrinsic muscles of the auricular pavilion?
Which nerve innervates the extrinsic muscles of the auricular pavilion?
What is the length of the external auditory canal?
What is the length of the external auditory canal?
What characteristic describes the cartilaginous portion of the external auditory canal?
What characteristic describes the cartilaginous portion of the external auditory canal?
Which artery supplies the external ear?
Which artery supplies the external ear?
Which nerve does NOT innervate the external ear?
Which nerve does NOT innervate the external ear?
What structure marks the end of the external ear?
What structure marks the end of the external ear?
Which wall of the tympanic cavity is associated with the jugular fossa?
Which wall of the tympanic cavity is associated with the jugular fossa?
Which structure is NOT part of the middle ear?
Which structure is NOT part of the middle ear?
What role does the vestibule in the ear have?
What role does the vestibule in the ear have?
Which part of the Malleus is NOT listed?
Which part of the Malleus is NOT listed?
What type of joint is the Incusomaleolar articulation?
What type of joint is the Incusomaleolar articulation?
Which bone has a lenticular process?
Which bone has a lenticular process?
Which part is common to both the anterior and posterior limbs of the Stapes?
Which part is common to both the anterior and posterior limbs of the Stapes?
Which type of joint is the Incusestapedial articulation?
Which type of joint is the Incusestapedial articulation?
Which nerve innervates the Tensor Tympani muscle?
Which nerve innervates the Tensor Tympani muscle?
Where does the Stapedius muscle originate?
Where does the Stapedius muscle originate?
Which artery supplies the middle ear?
Which artery supplies the middle ear?
What is the insertion point of the Tensor Tympani muscle?
What is the insertion point of the Tensor Tympani muscle?
Which nerve provides sensory innervation to the external surface of the tympanic membrane?
Which nerve provides sensory innervation to the external surface of the tympanic membrane?
Study Notes
OÃdo Externo: Pabellón Auricular
- The external ear is responsible for collecting sound waves and directing them towards the eardrum
- The pabellón auricular is composed of cartilaginous structures, including:
- Concha de la oreja
- Rama del Antihélix
- Antihélix
- Rama del hélix
- Hélix
- Fosa Triangular
- Fosa Escafoidea
- Tubérculo Auricular (Darwin)
- Trago
- Antitrago
- Escotadura Intertrágica
- Lobúlillo de la oreja
Músculos Externos (Pabellón Auricular)
- These muscles move and fix the ear in place
- Músculo Auricular Anterior:
- Origin: Galea Aponeurótica and Arco Cigomático
- Músculo Auricular Superior:
- Origin: Fosa Temporal and Galea Aponeurótica
- Músculo Auricular Posterior:
- Origin: Galea Aponeurótica and Apófisis Mastoide of the Temporal bone
Inervación: N.Facial (VII)
Conducto Auditivo Externo
- A portion of the Temporal bone
- Composed of two parts:
- Porción Cartilaginosa: (the most external part)
- Porción Ósea: (the longest part, part of the Temporal bone)
- Measures 2.5 cm in length
- The cartilaginous part is concave towards the front
IRRIGACIÓN DEL PABELLÓN AURICULAR
- Ramas de la Carótida Externa:
- Arteria Temporal Superficial
- Arteria Auricular Posterior
INERVACIÓN DEL PABELLÓN AURICULAR
- N.Auriculotemporal (V3)
- Rama del Plexo cervical
- Nervio Occipital menor
- Nervio Auricular mayor
- Rama Auricular del Vago (X)
- Rama Auricular del Facial (VII)
OÃdo Medio: Caja Timpanica
- LÃmites:
- Pared Superior: Tegmen Tympani
- Pared Inferior: Fosa Yugular
- Pared Anterior: Trompa de Eustaquio
- Pared Posterior: La Mastoide
- Pared Interna: Ventana Redonda, oval, pirámide, pÃa de cuchara, promontorio
- Pared Externa: Membrana Timpánica
Huesecillos del oÃdo
- Martillo (Maleolo):
- Mango, cabeza, cuello
- Apófisis interna and apófisis anterior
- Yunque (Incudo):
- Cuerpo
- Rama horizontal
- Rama vertical
- Apófisis lenticular
- Carilla auricular
- Estribo (Estapedo):
- Rama horizontal
- Rama anterior and posterior
- Base
Articulaciones de los huesecillos
- Incusomaleolar (Articulación bicondÃlea poco móvil):
- Sinovial - Encaje recÃproco (Yunque + Martillo)
- Incusestapedial (Articulación Muy Móvil):
- Sinovial - Enartrosis
- Can perform 6 movements + Estabilidad
- Estapedotimpanica (Between the Estribo and the oval window):
- Fibrosa - Sindesmosis (Tempancut estribo)
Músculos del oÃdo Medio
- Músculo Tensor del Timpanum:
- Origin: Trompa FaringoTimpanica
- Insertion: Mango del martillo
- Inervación: N.Maxilar inferior (V5)
- Function: Tenses the tympanic membrane
- Músculo del Estribo:
- Origin: Eminencia Piramidal del Temporal
- Insertion: Cuello del Estribo
- Inervación: N.Facial (VII)
- Function: Directs the Estribo towards the lateral side
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Description
This quiz covers the structure and function of the outer ear, including the auricular pavilion and external auditory canal. Learn about the different parts and their roles in hearing.
