Harelip
Question 1. Development of upper lip.
Answer:
- Each maxillary process grows medially.
- It fuses first with the lateral nasal process and then the medial nasal process.
- The mesodermal basis of the lateral part of the lip is formed from the maxillary process.
- The overlying skin is derived from ectoderm covering the process.
- The mesodermal basis of the median part of the lip is formed from the frontonasal process.
- The ectoderm of the maxillary process overgrows the mesoderm to meet the opposite maxillary process in the midline.
- Thus the entire upper lip is formed.
- The muscles of the lip are derived from mesoderm of the second bronchial arch.
“Understanding harelip through FAQs: Causes, symptoms, and treatments explained”
Question 2. Cleft lip/ Harelip
Answer:
Cleft lip Causes:
- Non fusion of maxillary processes with medial nasal process
- Defective development of frontonasal process
- Non fusion of two mandibular processes
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Question 11. Development of palate
Answer:
- Palatal shelves are given out from maxillary process
- These shelves grow medially
- Initially they grow down to the tongue vertically
- Later during 7th week, shelves turn upwards
- These shelves fuses with each other in midline
- Fusion occurs anteriorly and proceeds backwards
- Mesial edges fuses with lower border of nasal septum
- Thus, palate is formed along with the separation of two nasal cavities with that of oral cavity
- Intramembranous ossification occurs of the mesoderm of the plate to form hard palate
- This ossification does not extend into the most posterior portion, which remains as soft palate
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