Development Of The Upper Lip

Development Of The Upper Lip

Question 1. Development of upper lip and its anomalies
Answer:

Development of upper lip:

• 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 medial 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 entire upper lip is formed
• Muscles of upper lip are derived from mesoderm of the second branchial arch

“Understanding upper lip development through FAQs: Stages, functions, and uses explained”

Anomalies:

• Harelip/ Cleft lip-occurs due to
  • Non fusion of maxillary processes with medial nasal process
  • Defective development of frontonasal process
  • Non fusion of two mandibular processes

“Importance of studying upper lip development for medical students: Questions explained”

Question 2. Harelip.

Answer:

• It is used to describe defects of lip.

Harelip Causes:

• Non fusion of maxillary processes with medial nasal process-leads to defect in upper lip.
• Defective development of frontonasal process. Leads to midline defect of upper lip.
• Non-fusion of two mandibular processes – leads to midline defect of lower lip.

“Common challenges in mastering upper lip notes effectively: FAQs provided”