1.3: Clinical Anatomy of the Ear Flashcards
What does the temporal bone contain?
Organs for special sensory - hearing and balance
What nerves are contained within the temporal bone?
Facial (CN VII) and Vestibulocochlear (CN VIII)
*Label this diagram:
A –> G
Also, which bone is this?
A = Pterion B = Squamous Part C = Petrous Part D = External Acoustic Meatus E = Mastoid Process F = Styloid Process G = Zygomatic Process
Right Temporal Bone
*Label this diagram
A – F
A = Zygomatic Process of temporal bone B = Mandibular Fossa C = Styloid Process D = Stylomastoid Foramen E = Mastoid Process F = Extracranial Opening into the carotid canal
**Label this Diagram
G - M
G = Occipital H = Foramen Magnum I = Petrous Part J = Petrous Part K = Sphenoid Bone L = Palatine Bones L2 = Right Maxilla M = Left Maxilla
Describe the base of the skull in regards to temporal?
Clinical impact?
The temporal bone forms part of the base of the skull
Base of the skull damage (due to injury) can lead to special sensory damage (hearing/balance)
What is the base of the skull divided into?
- The base of the skull is divided into 3 cranial fossa
- Anterior
- Middle
- Posterior
What makes up the anterior cranial fossa?
*
Frontal
Ethmoid
Sphenoid
What makes up the middle cranial fossa?
*
Sphenoid
Temporal
What makes up the posterior cranial fossa?
*
Occipital (mainly)
Temporal
What are foraminae?
Foraminae are holes in the base of the skull
These allow things to pass through them - nerves, blood vessels etc.
What are the foraminae of the anterior cranial fossa?
Cribriform plate of the ethmoid bone
*
What nerves pass through the anterior cranial fossa?
CN I (Olfactory) through the cribriform plate of the ethmoid bone
What are the foramina of the middle cranial fossa?
- Optic Canal
- Superior Orbital Fissue
- Foramen Rotundum
- Foramen Ovale
- Intracranial opening of carotid canal
What are the foramina of the posterior cranial fossa?
Internal Acoustic Meatus
Jugular Foramen
Hypoglossal Canal
Foramen Magnum
What are the cranial nerves of the middle cranial fossa?
CN II (optic nerve) CN III (Oculomotor) CN IV (Trochlear) CN V1, V2, V3 (Trigeminal - Ophthalmic, Maxillary, Mandibular) CN VI (Abducens)