Development of The Thyroid Gland and Salivary Glands 1st Term 2025 PDF

‫كلية طب الفم‬ ‫واألسنان‬ ‫رؤية الكلية‬ ‫تتطلع الكلية أن تكون في مصاف المؤسسات التعليمية المعترف بها إقليمي ًا‬ ‫وعالمي ًا من خالل ب رامج تعليمي ة متط ورة وأبح اث تطبيقي ة م...

‫كلية طب الفم‬ ‫واألسنان‬ ‫رؤية الكلية‬ ‫تتطلع الكلية أن تكون في مصاف المؤسسات التعليمية المعترف بها إقليمي ًا‬ ‫وعالمي ًا من خالل ب رامج تعليمي ة متط ورة وأبح اث تطبيقي ة مبتك رة وتنمي ة‬ ‫مجتمعية مستدامة‪.‬‬ ‫‪The Faculty aspires to be a recognized educational institution, regionally and internationally, by‬‬ ‫‪providing advanced educational programs, innovative applied research, and sustainable community‬‬ ‫‪development.‬‬ ‫رسالة الكلية‬ ‫إع داد ط بيب أس نان مل تزم ب القيم االنس انية واألخالق المهني ة‪ ،‬ذو كف اءة‬ ‫معرفي ة وتطبيقي ة من خالل ب رامج تعليمي ة متط ورة تتواف ق م ع االحتياج ات‬ ‫الفعلي ة لس وق العم ل المحلي والع المي‪.‬كم ا تل تزم الكلي ة بإع داد بح وث‬ ‫تطبيقي ة متوافق ة م ع االس تراتيجيات القومي ة وك ذلك تق ديم خدم ة مجتمعي ة‬ ‫مستدامة وفقًا لمعايير الجودة العالمية‪.‬‬ ‫‪The mission is to prepare knowledgeable and well-trained dentists committed to human values and‬‬ ‫‪professional ethics, by developing advanced educational programs that correspond to the actual needs‬‬  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of the Thyroid Gland Prof. Iman Abdel Aal  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Student learning outcomes (SLOS)  Describe the development of the thyroid gland.  Describe the development of the salivary glands.  ‫كلية طب الفم‬ Development of the ‫واألسنان‬ General Anatomy GDN131 Thyroid  Origin: endoderm Gland of the floor of the pharynx between the tuberculum impar and the hypobranchial eminence (indicated by the foramen caecum in the adult tongue).  Time: 4th week  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of thyroid gland 2/3 Tongue Foramen caecum T Tuberculm Impar 1/3 (Ant. 2/3 of Tongue) Foramen Hyoid bone caecum Thyrogl-ossal d. L. G.T Hypobranchial Eminence Thyroid g. (Post. 1/3 of Tongue) T=Tuberculumimpar L.G.T.=Levator glandulaethyroidae  ‫كلية طب الفم‬ Development of the ‫واألسنان‬ General Anatomy GDN131 Thyroid  Steps of development: Gland  Thyroid primordium appears as a median endodermal proliferation in the floor of the pharynx between the tuberculum impar and the hypobranchial eminence.  This thickening forms a bilobed diverticulum which descends in front of the hyoid bone and laryngeal cartilages and remains connectd to the dorsum of the tongue by the thyroglossal duct.  ‫كلية طب الفم‬ Development of the ‫واألسنان‬ General Anatomy GDN131 Thyroid Gland  Steps of development:  The thyroid gland reaches its position in front of the thyroid cartilage and the upper part of the trachea.  The thyroglossal duct becomes obliterated and disappears or fibrosed to form the levator glandulae thyroidae.  ‫كلية طب الفم‬ ‫واألسنان‬ ‫‪General Anatomy GDN131‬‬  ‫كلية طب الفم‬ ‫واألسنان‬ ‫‪General Anatomy GDN131‬‬  ‫كلية طب الفم‬ ‫واألسنان‬ ‫‪General Anatomy GDN131‬‬  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Thyroid Gland Levator Glandulae Thyroidae Thyroid Gland  ‫كلية طب الفم‬ Development of the Thyroid ‫واألسنان‬ General Anatomy GDN131 Gland  ‫كلية طب الفم‬ Development of the‫واألسنان‬ General Anatomy GDN131 Thyroid Gland Hyoid Thyroid Thyroid cartilage cartilage Trachea Trachea  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Congenital Malformations of the Thyroid Gland  Thyroid agenesis: congenital absence of the whole gland leading to cretinism.  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Congenital Malformations of the Thyroid Gland  Lingual thyroid: the gland lies in the substance of the tongue Lingual thyroid i.e. failure of descent.  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Lingual thyroid  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Congenital Malformations of the Thyroid Gland  Aberrant thyroid: the gland may descend more to lie behind the sternum (retrosternal).  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Congenital Malformations of the Thyroid Gland  Thyroglossal cyst: due to persistence of part of the thyroglossal duct unobliterated. Thyroglossa l cyst  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Thyroglossal cyst  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Congenital Malformations of the Thyroid Gland  Thyroglossal fistula: the thyroglossal cyst may opens into the skin.  ‫الفم‬ ‫طب الفم‬ ‫كليةطب‬ ‫كلية‬ ‫واألسنان‬ ‫واألسنان‬ ‫‪General Anatomy GDN131‬‬ ‫‪Quiz‬‬  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of The Salivary Glands  ‫كلية طب الفم‬ Development of the Salivary ‫واألسنان‬ General Anatomy GDN131 Glands  The three salivary glands develop from the lining epithelium of the oral cavity in the form of buds which branch repeatedly and become transformed into glandular tissue.  The parotid gland develops from the ectodermal lining of the vestibule of the mouth, while the submandibular and sublingual glands develop from the endodermal lining of the floor of the mouth.  ‫كلية طب الفم‬ ‫واألسنان‬ ‫‪General Anatomy GDN131‬‬  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Steps of Development of parotid gland Development Parot. g. Groove Duct – Buds Acini Gland Groov Distal end Proximal end e Development of parotid gland Parot. g. Groove Duct – Buds Acini Gland Duct Distal end Proximal end Development of parotid gland Branching Recede - Proceed Groove Duct – Buds Acini Gland Parot. g. Buds (canalization) Acini Gland  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Steps of Development  ‫كلية طب الفم‬ Development of the ‫واألسنان‬ General Anatomy GDN131  Parotid Gland A groove appears behind the angle of the mouth.  The groove then closes to form the parotid duct which extends backwards.  The blind distal end branches repeatedly and canalizes to form the acini of the gland.  The duct receeds from the angle of the mouth to open in the vestibule of the mouth opposite the upper 2nd molar tooth.  ‫كلية طب الفم‬ Development of the‫واألسنان‬ General Anatomy GDN131 Parotid Gland  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of parotid gland Parot. g. Groove Duct – Buds Acini Gland Mouth Opening  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of the  Submandibular A groove appears Gland between the tongue and Submandibular the gum (alveolo– Gland lingual) groove. Tongue  The groove then closes Development of submandibular gland to form the Submandi bular g. Sublingual submandibular duct. Gland  The distal end of the Groove (alveolo – lingual) Duct – Buds Acini Gland duct grows backwards, branches repeatedly and canalizes to form the acini of the gland.  The anterior end of the duct proceeds forwards to open close to the frenulum of the tongue.  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of the Submandibular Gland Proceed  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of submandibular gland Submandi bular g. Groove (alveolo – lingual) Duct – Buds Acini Gland  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Duct Middle line Opening of Duct  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of the Sublingual Gland  It arises as small buds develop Submandibular Gland from the alveolo– Tongue lingual groove. Development of submandibular gland  These buds gain Submandi bular g. Sublingual Gland a common Groove (alveolo – lingual) Duct – Buds Acini Gland sheath and appear as one gland having several openings into the floor of the mouth.  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Ducts  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Development of sublingual gland Development of submandibular gland Submandi bular g. Groove(alveolo – lingual) Duct – Buds Acini Gland Sublingual gland Groove – Buds Acini Gland  ‫الفم‬ ‫طب الفم‬ ‫كليةطب‬ ‫كلية‬ ‫واألسنان‬ ‫واألسنان‬ General Anatomy GDN131 Sum up  Development of the thyroid gland:  Origin  Time  Steps of development  Congenital malformations  Development of the salivary glands:  Parotid  Submandibular  Sublingual  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Formative Assessment  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 :Define the following -  Thyroid agenesis  Aberrant thyroid  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Complete the following statement by suitable - :words  The parotid gland arises as a groove which appears behind ………. while the submandibular gland arises as a groove named ………. groove.  ‫كلية طب الفم‬ ‫واألسنان‬ General Anatomy GDN131 Thank you