1.6: Pathology Flashcards
Describe the lining of the outer ear? The middle ear?
Outer ear is lined by epidermis (skin)
Middle ear is lined by columnar mucosa
What does this photo show?
Organ of Corti
What does this photo show?
Label it?
Section of the cochlea
A = Scala Vestibula
B = Scala Tympanic
C = Scala Media
Describe the lining of the nose?
Nasal Vestibule = Squamous Epithelium (skin)
Rest of nose = Schniederan Epithelium - identical to Respiratory Epithelium (Pseudostratified Ciliated Columnar)
Describe respiratory epithelium?
Pseudostratified Columnar Epithelium
Where is Schneideran epithelium found?
In the nose (not the nasal vestibule)
Describe the lining of the throat?
Top of throat/epiglottis ect is squamous
True vocal chords is squamous
After this it is respiratory epithelium
Describe salivary glands
- Endocrine or exocrine?
- Two parts?
- What colour do they stain?
Exocrine gland
They have an ACINAR compartment (produces liquid to secrete into ducts) and DUCTULAR compartment
They stain very darkly
Describe Otitis Media?
Very common ear inflammation of the middle ear
Usually viral also can be bacterial (Strep Pneumoniae, Haemophilus Influenzae) etc
Causative agent of chronic otitis media?
Pseudomonas Aeruginosa
Describe a Cholesteatoma?
This is not a tumour but instead a destructive growth of keratinzed squamous epithelium
It is squamous epithelium in the wrong place (should only be seen in the external ear)
Can be seen in any age and is common
Presents with hearing loss and ear discharge
What is cholesteatoma associated with?
Chronic otitis media
Perforated ear drum
Describe a vestibular schwannoma?
Tumour of the schwann cells that form the sheath of the 8th cranial nerve (Vestibulocochlear)
Usually sporadic and unilateral
Presents as unilateral hearing loss, tinnuitis, possible loss of balance
What does this photo show?
Vestibular Schwanomma
If a 14 year old boy presented with bilateral vestibular schwanommas, what would you suspect?
NF2 (Neurofibromatosis 2)