DEVELOPMENT OF PAROTID GLAND

DEVELOPMENT

1. Name- Ravi Gupta Roll no.-70 PAROTID GLAND DEVELOPMENT & IT’S SURFACE ANATOMY

2. CONTENTS Introduction Location Surface anatomy Development of parotid gland Summary

3. INTRODUCTION Para= around and otid= ear i.e.- gland present around the ear. Largest of three pairs of main salivary glands. Secretion is mainly serous type.

4. LOCATION It is situated below external acoustic meatus, between the ramus of mandible and sternocleidomastoid muscle.

5. SURFACE ANATOMY OF PAROTID GLAND 1 st point at the upper border of mandibular condyle. 2 nd point just above the centre of the masseter muscle. 3 rd point 2cm below & behind the angle of mandible.

6. 4 th point at mastoid process. Line joining the point 1,2,3 make the anterior border. Point 1 & 4 make the upper border. Point 4 and 3 make the posterior border.

7. SURFACE ANATOMY OF PAROTID DUCT Mark a point at lower border of concha of ear Put a point midway between the ala of nose and red margin of upper lip Middle third of the line joining these points represents the parotid duct

8. DEVELOPMENT OF PAROTID GLAND Develops during 6 th week of IUL. 1 st major salivary gland to be formed. It develops as an ectodermal furrow from the angle of stomodeum. Ectodermal furrow grows outwards between mandibular and maxillary process.

9. Epithelial buds grow posteriorly towards the otic placodes of the ears & branch to form solid cord. Later, furrow is converted into a tube which form the parotid duct. Medial end of duct opens into the angle of primitive mouth

10. Secretion by parotid gland via parotid duct begins at 18 th week of gestation. while from the lateral end the cord of ectodermal cells project into surrounding mesoderm Around the 10 th week of IUL, these are canalized to form ACINI & DUCTULES of parotid gland.

11. Later, the angle of mouth is shifted more medially due to fusion of mandibular & maxillary process. In adult, the parotid gland open into the vestibule of mouth, opposite of upper 2 nd molar teeth which indicates the position of angle of the primitive oral orifice.

12. SUMMARY

13. BIBLIOGRAPHY Inderbir Singh's- human embryology Clinical embryology by Vishram Singh Surface anatomy by A. Halim Textbook of anatomy by Vishram Singh

14. THANK YOU..