Mastoid Air Cells Of The Temporal Bone: Structure And Function

Mastoid Air Cells Of The Temporal Bone: Structure And Function

Question 1. Mastoid air cells
Answer:

• These are series of intercommunicating spaces present within mastoid process

Mastoid air cells Size and number:

• Varies

Mastoid air cells Blood supply:

Arteries:

• Posterior tympanic artery from stylomastoid branch of posterior auricular artery

Veins:

• Mastoid emissary vein
• Posterior auricular vein
• Sigmoid sinus

Lymph nodes:

• Posterior auricular lymph nodes
• Upper deep cervical lymph nodes

Mastoid air cells Nerves:

• Tympanic plexus around glossopharyngeal nerve
• Meningeal branch of mandibular nerve

Question 2. Middle ear ossicles
Answer:

1. Malleus:

• It resembles a hammer
• It is the largest ossicles

Malleus Parts:

• Rounded head
• Neck
• Anterior process
• Lateral process
• Handle

2. Incus or anvil:

• It resembles an anvil, used by blacksmith
• It resembles a molar tooth

Incus or anvil Parts:

• Body
• Long process

3. Stapes:

• It is shaped like a stirrup
• It is smallest, medially placed ossicle

Stapes Parts:

• Small head
• Narrow neck
• Two limbs
• Footplate, foot-piece or base