longitudinal internal muscles 21 Constrictor Muscles Three pairs of curved

Longitudinal internal muscles 21 constrictor muscles

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longitudinal (internal) muscles 2.1 Constrictor Muscles Three pairs of curved sheets of muscular fibers that lie in the sides and posterior wall of the pharynx and are so arranged that they overlap each other from below upwards Inserted to the medial raphe and descent in the posterior wall of the pharynx from the pharyngeal tubercle of the base of the skull Consist of the following muscles: o Inferior constrictor muscle o Middle constrictor muscle o Superior constrictor muscle Fig 8. The pharynx seen from behind. Note the three constrictor muscles and the position of the stylopharyngeus muscles. 2.2 Longitudinal Muscles Consist of the following muscles: o Stylopharyngeus muscle o Palatopharyngeus muscle o Salpingopharyngeus muscle o Cricopharyngeus muscle
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S 1 T 20 5 of 6 Nose, Paranasal Sinuses, Pharynx Gross Human Structural Biology 3. Pharyngobasilar Fascia Lines the deep surface of pharyngeal muscles Lies between the muscles and submucous coat Strong in its upper part and maintains the integrity of the wall of the pharynx where the superior constrictor is absent The principal means by which the pharynx is attached to the base of the skull Attached to auditory tubes and the bony margins of the choanae 4. Submucous Coat Contains great numbers of mucous pharyngeal glands and numerous nodules of lymphatic tissues which are aggregated in some areas forming the nasopharyngeal tonsils 5. Mucous Membrane Lines the whole interior and is continuous with the mucous membrane of the cavities that open into the pharynx or out of it C. DIVISIONS OF THE PHARYNX Fig 9.Sagittal section through the nose, mouth, pharynx, and larynx to show the subdivisions of the pharynx. 1. Nasopharynx or Epipharynx Widest part of the pharynx behind the nasal cavity, above the soft palate (uvula) and below the body of the sphenoid and basilar part of occipital bone has immovable walls, except soft palate, consequently its cavity always remain patent 2. Oropharynx or Mesopharynx lies behind the mouth and tongue anterior wall of its lower part contains the pharyngeal part of the dorsum of the tongue soft palate (uvula) to the upper border of the epiglottis o epiglottis is a leaf-like plate of cartilage largely enveloped in mucous membrane C2 to C3 vertebra 3. Laryngopharynx or Hypopharynx found behind the larynx and communicates in front with laryngeal cavity through the laryngeal inlet epiglottis to the cricoid cartilage; posteriorly, C3 to upper C6 vertebra continuous inferiorly with esophagus at C6 vertebra or lower border of cricoid cartilage REFERENCES 1. Gross HSB Lecture Guide and Laboratory Manual 2. Moore, KL., Dalley, AF., Agur, AMR. Clinically Oriented Anatomy. 6 th edition. Philadelphia: Lippincott Williams & Wilkins; 2010 3. Snell, RS. Clinical Anatomy by Regions . 8th edition. Philadelphia: Lippincott Williams & Wilkins; 2012
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Trans 20 | de Leon 6 of 6 Gross Human Structural Biology Henedina Eva C. Barilea, MD | 23 11 2017 Nose, Paranasal Sinuses, Pharynx Semester 1 Fig 10. Paranasal Sinuses
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