Embryology:Development of internal ear

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The skin

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Normal structure of skin :- The skin or the integument is the external organ that protects against mechanical trauma , UV light 💡& infection . In addition,  the skin is concerned with thermoregulation,consevation,excretion of fluid & sensory perception .  ðŸ‘† -Cone shaped dermal papillae extend upward into epidermis forming peg-like ridge of the epidermis . The histology   of  normal skin shows some variation in different parts of the body.  In general,  it is composed of  two layers which are separated by irregular border :-                                                *Epidermis                 *Dermis  *Epidermis :- Composed of  five layers from base to surface . 1-Basal cell layer ( stratum germinatum) :- #consist of a single layer of ...
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Introduction :- Benign tumour of larynx can be divided into three groups -                 *Non-neoplastic tumour                 *Neoplastic tumour                 *Saccular swelling  Benign Neoplastic tumour are less common than malignant tumour . Laryngeal papilloma account for approximately 80% of all benign neoplasm of the larynx . Non-neoplastic vocal fold mucosal disorders:-     *vocal nodules     *vocal polyp     *Reinke's edema     *Contact ulcer     *Intubation granuloma     *Leukoplakia     *Amyloid tumour Neoplastic tumour :-      *Reccurent respiratory papillomatosis      *Chondroma       *Hemangioma      *Lipoma       *Fibroma Sacc...
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