(Q2) Ear

Question 1

Pinna

Answer 1

The external form of the ear
- Pinna=Ear
- Latin means “Feather, wing, fin”

• The external form of the ear structure is created by cartilage and adipose tissue
• no bones in the external ear; ear bones are in the internal ear

Question 2

Helix

Answer 2

The outer rim of the ear
- Helix = spiral
- Most superior and posterior margin of ear
- Begins in the concha, ascends and curves around the superior margin of the ear
- Extends inferiorly to end at the superior portion of the lobe

Question 3

Antihelix

Answer 3

• Long, narrow projection (ridge)
• “anti” helix: opposite in position from helix

Question 4

Scapha

Answer 4

Long, narrow depression
Intermediate to the helix and antihelix
scapha = boat
Shallowest depression in the ear

Question 5

Crura

Answer 5

• The bifurcation of the superior
  margin of the antihelix
• Crura = legs; The antihelix ascends and “splits” into two “legs”
• There is a superior and anterior branch

Question 6

Triangular fossa

Answer 6

A depression between the two “legs”
of the crura
2nd deepest depression in the ear

Question 7

Tragus

Answer 7

Small, wedge-like prominence
Protrudes from cheek
Protects earpassage
helps in echolocation

Question 8

Antitragus

Answer 8

Small eminence
Opposite in position to the tragus

Question 9

Intertragic notch

Answer 9

“U” shaped opening
Intermediate to the tragus and
antitragus
Begins at the superior portion of the ear lobe

Question 10

Crus

Answer 10

crus = leg (singular form of crura)
A.K.A. The Crus of the Helix
Portion of the helix that descends
inferiorly into the depth of the ear
This is the beginning of the helix

Question 11

Where does the Helix Begin and End?

Answer 11

Crus&raquo_space; Helix&raquo_space; Lobe
Tracing the form of the helix, It begins at the crus
The helix ascends superiorly around the top margin, creating a spiral
Ends at the superior margin of the lobe

Question 12

Lobe

Answer 12

• Soft, fleshy portion of the inferior
  margin of the ear
• May be attached or detached

Question 13

Concha

Answer 13

conch = shell
Large, concavity in the central part of the ear
Deepest depression

Question 14

External Auditory Meatus

Answer 14

Passageway into the internal ear
A.K.A. Ear Canal

External = outside
Auditory = sound (audio)
Meatus = passageway

Question 15

Width of Entire Ear

Answer 15

Width of the ear is 2/3 the length of the ear

Question 16

Thirds of the Ear

Answer 16

Cura & Helix (Superior Part) creates superior 1/3
Concha creates middle 1/3
Lobe creates inferior 1/3

Question 17

Halves of the Ear

Answer 17

Crus creates the halfway mark of the ear from
superior to inferior

Question 18

Superior Margin of the Ear: Ear Position and Placement

Answer 18

Superior margin of ear is at same level as eyebrow

Question 19

Inferior Margin of the Ear: Ear Position and Placement

Answer 19

Inferior margin of ear is at same level as base of nose

Question 20

Angle of the Ear: Ear Position and Placement

Answer 20

Angle of the ear is similar to angle of the nose

Question 21

Zygomatic Arches: Ear Position and Placement

Answer 21

Zygomatic arch is at vertical halfway mark of ear
External auditory meatus is immediately inferior to zygomatic arch