Important ENT Anatomy Notes: Pyriform Fossa and Mandible

Important ENT Anatomy Notes: Pyriform Fossa and Mandible

Question 1. Significance of Pyriform fossa
Answer:

• Pyriform fossa lies between quadrate membrane & medial side of thyroid cartilage
• Pyriform fossa is transverse by internal laryngeal nerve
• Pyriform fossa is used to smuggle out precious stones, diamonds, etc
• Thus it is called smuggler’s fossa
• Tumours in it causes dysphagia

Question 2. Name the bones ossified in the membrane
Answer:

• Frontal Parietal
• Temporal
• Mandible
• Palatine
• Nasal
• Vomer
• Zygomatic
• Maxilla

Question 3. Name different types of sutural joints
Answer:

• Based on the structure of their articular surfaces, there are 5 types of sutural joints:
  1. Plane suture
  2. Squamous suture
  3. Serrate suture
  4. Denticulate suture
  5. Schindylesis

Question 4. Laws of ossification
Answer:

Ossification occurs by two processes

1. Endochondrial ossification

• Endochondrial ossification involves cartilage as precursor
• Example: healing of fractures treated with plaster of Paris

2. Intramembranous ossification

• Intramembranous ossification is direct laying down of bone into the primitive connective tissue
• Example: healing of fractures treated with open reduction and internal fixation

Question 5. Nerves related to mandible.
Answer:

Question 6. Name any four muscles attached to ramus of mandible.
Answer: