1. Anatomical terms Planes of section: Frontal/Coronal: Front and back
Sagittal: Left and right
Median/Midsagittal: Through the center
Axial/Horizontal/Transverse: Upper and lower

2. Anatomical directions
Anterior/Ventral: Front
Posterior/Dorsal: Back
Inferior: Bottom
Superior: Top
Lateral: Away from median plane
Medial: Toward the median plane

3. Anatomy of the auditory system
Contained in the temporal bone
Located on the sides of the skull

4. Parts of the temporal bone
Squamous
Mastoid
Tympanic
Petrous
Medial view of right ear.
Note: IAM is internal auditory
meatus, which is different from the
external auditory meatus.
Lateral view of right ear

5. Parts of the auditory system
External ear
Middle ear
Inner ear

6. Anatomy of the ear

7. External ear Consists of Auricle or Pinna: Mostly cartilage
External auditory canal/meatus

8. Parts of the Pinna Concha: Bowl or deep central portion
Helix: Prominent ridge that begins superior to the opening of the canal and runs around the pinna
Antihelix: Interior ridge parallel to the helix
Triangular fossa: Triangular depression formed anteriorly and superiorly by the helix
Lobule: Most inferior part of the pinna
Tragus: Small flap at the anterior side of the concha

9. External auditory meatus
Length is approximately 28 mm
Diameter is approximately 7 mm
Not perfectly straight
Ends in the tympanic membrane
Outer half of the canal formed by cartilage
Skin secretes cerumen
Medial part formed by bone from the squamous and tympanic portions of the temporal bone