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الرتبة : ادارة الموقع عدد المساهمات : 1203 Level : 2104 Like : 5 تاريخ الميلاد : 29/05/1988 تاريخ التسجيل : 20/12/2010 العمر : 35 المزاج : مزاج طبيب أسنان ممارس
| موضوع: الداير حلقة اللمفاوي الداخلي والخارجي Waldeyer Inner and Outer lymphatic ring 15/02/12, 01:30 am | |
| Waldeyer Inner and Outer lymphatic ring Waldeyer’s lymphatic ring is a collection of lymphoid tissue It is also called as Waldeyer’s-Pirogov tonsillar ring It is divide into 2 types based on its location:
- Waldeyer’s outer ring: present in the neck
- Waldeyer’s inner ring / Waldeyer’s tonsillar ring: The lymphatic ring present around the pharynx
Functions and Importance of Waldeyer lymphatic ring:
- It plays an important role in protection against pathogens
- It was named after the nineteenth century German anatomist Heinrich Wilhelm Gottfried von Waldeyer-Hartz.
Waldeyer’s inner ring It is located in the nasopharynx and oropharynx The components are:
- Adenoids (nasopharyngeal tonsil)
- Tubal tonsil
- Palatine tonsil
- Lingual tonsil
It helps protect the body against inhaled and ingested pathogens
Waldeyer’s outer ring It is composed of various lymph nodes in the neck – mostly cervical lymph nodes The component lymph nodes are:
- Occipital
- Post auricular
- Pre auricular
- Parotid
- Facial (superficial – upper, middle, lower; deep)
- Submandibular
- Submental
- Superficial cervical
- Anterior cervical
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