咽解剖与生理的幻灯讲解:

Slide 2: The posterior aperture (choanae) of the nasal cavities open into the
nasopharynx;
The posterior ope...
wall is formed almost entirely of fascia.

Slide 34: * Collection of lymphoid tissue in the mucosa of the pharynx surround...
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咽解剖与生理的幻灯片讲解

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咽解剖与生理的幻灯片讲解

  1. 1. 咽解剖与生理的幻灯讲解: Slide 2: The posterior aperture (choanae) of the nasal cavities open into the nasopharynx; The posterior opening of the oral cavity (oropharyngeal isthmus) opens into the oropharynx; The superior aperture of the larynx (laryngeal inlet) opens into the laryngopharynx. Slide 5: According to the anterior relationship the pharynx is sundivided into three regions Slide 10: Enlarge of this tonsil,known as adnoids, can occlude the nasppharynx so that breathing is only possible through the oral cavity. Slide 15: * When holding liquid or solids in the oral cavity, the oropharyngeal isthmus is closed by depression of the soft palate, elevation of the back of the tongue, and movement toward the midline of the palatoglossal and palatopharyngeal folds. This allows person to breath while chewing or manipulating material in the oral cavity. On swallowing, the oropharyngeal isthmus is opened, the palate is elevated, the pharyngeal cavity is closed, and the food or liquid is dericed into the esophagus. A person can not breath and swallow at the same time because the airway is closed at two sites , the paryngeal isthmus and the larynx. ** The palatin tonsils are visible through the oral cavity just posterior to the palatoglossal folds. Slide 20: * The pyriform fossea form channels that direct solids and liquids from oral cavity around the raised laryngeal inlet and into the esophagus. Slide 22: show pyriform fossae and posterior view of pharyngeal wall opend Slide 24: *The pharyngeal wall is formed by skeletal muscles and by fascia ** The muscles of the pharynx are organized into two groups based on the orientation of muscle fibers. 1. constrictor muscles have thefibers oriented in a circular direction relative to the pharyngeal wall. 2. longitudinal muscles have fibers orientedvertically. 3. levator palati, tensor palati,palato-glossus,etc control the soft palate Slide 25: * Contracting in succession squeeze the food downwards to the esophageal entrance. Slide 29: * which sandwich the pharyngeal muscles between them. ** The fascia reinforces the pharyngeal wall where muscle is deficient. This is particularly evident above the level of the superior constrictor where the pharyngeal 1
  2. 2. wall is formed almost entirely of fascia. Slide 34: * Collection of lymphoid tissue in the mucosa of the pharynx surrounding the openings of the nasal and oral cavity are part of the body’s defence system. The largest of these collections form the distict masses (tonsils). Slide 46: * Motor and most sensory innervation of the pharynx is mainly through branches of the vagus nerve[Ⅹ] and glossopharyngeal nerve[Ⅸ],which form a plexus in the outer fascia of the pharyngeal wall. 2

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