Nasal Cavity, Pharynx and Larynx

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1- Nasal Cavity, Pharynx and Larynx Lecture 1 – Upper Respiratory Tract Objectives By the end of this lecture the student should be able to describe the microscopic structures of: ! Vestibule of the nasal cavity. ! Respiratory mucosa of the nasal cavity. ! Nasal septum. ! Olfactory mucosa of the nasal cavity. ! Mucosa of the paranasal sinuses. ! Larynx. 3- Olfactory 1- Vestibule Region Para-nasal Sinuses Respiratory Sinusitis Epithelium Lamina Propria 2- Respiratory Region Mucousa “Mucous Membrane” A) Epithelium “respiratory” Pseudo-stratified ciliated columnar with goblet cells B) Lamina Propria 1- Large arterial plexuse & Venous sinuses “Vascular” 2- Many Seroumucous glands “Acini” 3- Abundant Lymphoid elements Site 2- Upper part 1- Roof of of Nasal Nasal Cavity Septum Structure A- Olfactory Epithelium > Pseudo-stratified Columnar Olfactory Cells Bipolar Neurons “olfactory nerve cells” Sustentacula Supporting Cells Columnar cells. Function > Physical support and nourishment for Olfactory Cells Basal Cells Pyramidal in shape, basal in position and act as stem cells. B- Lamina Propria > Highly Vascular CT 2- Bundles of 1- Bowmans’s Unmylinated Nerve “Olfactory” Glands Fibers > Axons + > Serous Acini Schwan like cels “Glial” 3- Rich Vascular 4- Numerous Plexuse Lymphoid Elemnts Larynx A) Mucousa 2- Lamina Propria 1- Epithelium • Pseudo-stratified Columnar Epithelium With Goblet Cells • Location: • 1- Vocal Folds • 2- Super Surface of Epiglottis There are 2 pairs of Shelf-like Mucosal Folds Epithelium: Non keratinized Respiratory Epithelium Stratified Squamous Lamine propria Lamina Propria Loose C.T. with CT Containing seromucous bundles of glands elastic fiber lymphoid elements & and skeletal adipose cells muscles Larynx B) Cartilages C) Muscles Ligaments Respiratory Epithelium Pseudo-stratified Ciliated Columnar Epithelium + Goblet Cells Stem Cells E.g. Serotonin MCQ’s 1) All of the following are from the conducting 2) Vestibule wall is portion of the respiratory formed by? system except ?! A-Elastic cartilage. A-larynx. B-Compact Bone. B-Terminal Bronchioles. C-Hyaline cartilage. C-Respiratory Bronchioles. D-Fibrocartilage. D-Primary bronchi. 3) which type of cell is responsible for the physical 4) From which type of support and nourishment cartilage the epiglottis is for olfactory cells? made of? A-Goblet cell. A-Elastic cartilage. B-Sustentacular cell B-Hyaline cartilage. C-Basel cell. C-Fibrocartilage. D-Glial cell. Q5) Which of the following structures does the lamina of the vocal cords of the larynx Lacks? A-Elastic fibers. B-Skeletal muscles. C-Lymphoid nodules. Done By: Amal Afrah Najd Al Omran Thank you for Checking our Work ForFor any any correction, correction, suggestion suggestion or or any any useful useful informationinformation do do not not hesitate hesitate to to contact contact us: us: [email protected]@gmail.com .

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