The Ear Flashcards
Another name for the ear.
Pinna
This changes less in a lifetime than any other feature.
The ear
To capture and direct sound to the earpassage.
Purpose of The Ear
The form of the mass of the ear.
Wedge
The form of the outer rim of the ear.
Question Mark
The linear form of the anterior border of the ear.
Relatively Straight
The ear is composed of this.
Cartilage
The exception to the ear being made of cartilage.
The Fatty Lobe
As paired features, the ears display the most noticable differences in position and form when compared _________.
Together
Why would you still be able to model a missing or damaged ear from a remaining ear?
- The details of both ears can’t be viewed together.
- Unless there is some perculiarity, present people tend to ignore this features intricacies.
The details of these cannot be viewed together.
Both Ears
Unless there is some peculiarity present, people tend to ______ the ears intricacies.
Ignore
The width is two thirds the length, with the widest portion usually in the superior third (of the ears length).
Proportions of The Ear
Two thirds it’s length.
Width of The Ear
The superior third of the ear’s length.
Widest Portion of The Ear
These provide greater accuracy than proportions for locating the ear.
Anatomical Guides
The opening of the ear passage.
External Auditory Meatus
Originates from the skull directly superior to the ear passage.
Position of the Zygomatic Arch
Divides the length of the ear.
Zygomatic Arch
Lies directly anterior to the ear passage.
Mandibular Fossa
Hidden by the tragus.
Mandibular Fossa
Lies posterior and inferior to the ear passage.
Position of The Mastoid Process
Hidden by the lob of the ear.
Mastoid Process
- External Auditory Meatus
- Zygomatch arch
- Mandibular Fossa
- Mastoid process
Anatomical Guides for Locating The Ear
The keystone to accurate location of the ear.
- More accurate than facial proportions.
External Auditory Meatus
The ear passage aligns with this.
The front border of the ear.
This lies directly above the ear passage and divides the ear into equal halves.
Zygomatic Arch
- Mandibular Fossa- Directly anterior to the ear passage.
- Mastoid Process- Lies below and behind the ear passage, covered by the lobe.
How to locate the ear when the external auditory meatus and zygomatch arch are destroyed.
The outer rim of the ear.
Helix
General shape of the helix.
Question Mark
Lies within the concha.
- Crus- lies upon the zygomatic arch
- Is flattened into the wall of the concha.
- Divides the length of the ear.
- Is deeper than the surface of the cheek.
Origin of the Helix
At the top of the lobe.
- Exception: Is on a “lobeless” ear where the cartilage continues to the cheek.
Termination of the Helix
The beginning of the outer rim lying in the concha.
Crus of the Helix
The inner rim of the ear.
- Has a greater width than the Helix
Antihelix
At the superior portion of the lobe.
Origin of the Antihelix
Where the upper portion bifurcates into two branches (crura).
Termination of the Antihelix
The bifurcation of the antihelix.
Crura
The upper branch of the antihelix.
Superior Branch of the Crura
The measurement of the superior one third of the ear’s lenth.
Anterior Branch of the Crura
The shallow depression lying between the crura.
Triangular Fossa
- Located in the anterior portion of the ear.
- Extends relatively far behind the helix.
Location of the Triangular Fossa
The fossa between the inner and outer rims of the ear.
- Is relatively long.
Scapha
The shallowest of the depressions.
Depth of the Scapha
The concave shell of the ear.
- Creates the middle third of the lenth of the ear.
Concha
Graduated to the earpassage.
Depth of the Concha
Behind and above the earpassage.
Location of the Concha
The small eminence rising from the cheek and protecting the ear passage.
Tragus
- A wedge-like mass
- The inferior end attaches to the lobe.
- The front border is often indistinct.
- May be marked by a vertical furrow.
Characteristics of the Tragus
The small eminence on the upper margin of the lobe.
- Slightly inferior and posterior to the tragus.
Antitragus
The hollow between the tragus and antitragus.
Intertragic Notch
Anteriorly on the upper border of the lobe.
Location of the Antitragus
The fatty inferior segment of the ear.
- The lower one third of the ear’s length.
- Mastoid process is the underlying structure.
Lobe
