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Questions and Answers
What is the primary function of the auricle?
What is the primary function of the auricle?
Which part of the temporal bone is responsible for forming the bony labyrinth of the inner ear?
Which part of the temporal bone is responsible for forming the bony labyrinth of the inner ear?
What type of tissue primarily composes the structure of the auricle?
What type of tissue primarily composes the structure of the auricle?
How long is the external auditory canal typically?
How long is the external auditory canal typically?
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Which nerve is NOT involved in the innervation of the auricle?
Which nerve is NOT involved in the innervation of the auricle?
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What is one of the main protective functions of the external auditory canal?
What is one of the main protective functions of the external auditory canal?
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Which structure does the external auditory canal extend to?
Which structure does the external auditory canal extend to?
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Which of the following describes the dimensions of the auricle?
Which of the following describes the dimensions of the auricle?
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Study Notes
Temporal Bone
- Consists of three parts: squamous, petrous and tympanic.
- Squamous part is superior and forms the lateral wall of the skull.
- Petrous part is inferior and contains the bony labyrinth of the inner ear.
- Tympanic part communicates with the tympanic cavity and contains the mastoid cells.
Auricle
- Visible part of the ear.
- Located on each side of the head between the mastoid process and the temporal bone.
- Size varies between individuals and is typically 6-8 cm in height and 3-5 cm in width.
- Made of cartilage covered with skin for flexibility and sound optimization.
External Auditory Canal (EAC)
- Extends from the auricle to the eardrum.
- Acts as a resonator.
- Approximately 2.5-3 cm long and narrows in the middle.
- Conducts sound waves to the tympanic membrane.
- Produces earwax to protect the inner ear.
- Located in the temporal bone and ends at the tympanic membrane.
- Initial part is cartilaginous and has an S-shaped form.
EAC Walls
- Anterior: Parotid gland and the temporomandibular joint.
- Posterior: Bone separating the EAC from the mastoid air cells.
- Inferior: Parotid gland.
- Superior: Middle cranial fossa.
- External: External acoustic meatus.
- Internal: Tympanic membrane.
Blood Supply
- The EAC is supplied by the external carotid artery.
Nerves
- Auriculotemporal nerve: Supplies the helix and tragus.
- Facial nerve: Supplies the auricle, concha, and part of the antihelix.
- Cervical plexus: Supplies the lobule, helix, and antitragus.
- Vagus, facial, and trigeminal nerves: Innervate the external auditory canal.
Functions
- Auricle: Collects sounds.
- External Auditory Canal: Conducts sounds and amplifies certain frequencies.
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Description
This quiz explores the anatomy of the ear, focusing on the temporal bone, auricle, and external auditory canal. It covers their structure, function, and significance in hearing. Test your knowledge of ear anatomy with detailed questions on these components.
