PHTY101 Lecture Notes - Lecture 12: Hyaline Cartilage, Hyoid Bone, Phonation
Tube, fibromuscular
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Shared space between the respiratory and the digestive tracts
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Begins at back of nose, extends to bottom of larynx (voice box)
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Lies behind and communicates with nasal cavity (nasopharynx), oral cavity (oropharynx)
and larynx (laryngopharynx)
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Lined with mucous membrane
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12.1 Identify the pharynx and its boundaries
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From posterior nostril to tip of soft palate
Nasopharynx
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Tip of soft palate to tip of epiglottis
Oropharynx
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Tip of epiglottis to lowest edge of larynx
Laryngopharynx
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12.2 Divide the pharynx into its component sections:
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Muscular walls function in the process of swallowing
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A pathway for the movement of food from the mouth to the oesophagus
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12.3 Describe the functions of the pharynx
•
Internal layer -> elevators of the pharynx
Longitudinal orientation
Important sensory distribution as it sends messages back to the brain
about what you are swallowing
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E.g. Too hot- triggering a hot reflex, sharp object, or needs more
chewing etc.
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Internal layer is lined with mucous membrane
longitudinal muscles
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External layer -> the constrictors
Circular orientation -> constrict pharynx
circular muscles
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12.4 Describe the musculature of the pharynx
•
Vagus nerve (X)
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Glossopharyngeal nerve (IX)
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Longitudinal
Vagus nerve (X)
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Circular
Motor nerve supply of muscles of the pharynx
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Sensory supply of lining of the pharynx -> vagus nerve (X)
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12.5 Describe the sensory and motor nerve supply of the pharynx
•
First stage
Food from mouth to the pharynx
Involves muscles of the cheeks, tongue and oral cavity
Aim to reduce the capacity of the oral cavity and to utilise the tongue as a chute to
push food into the oropharynx
Voluntary
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12.6 Describe the process of swallowing, describing the voluntary and involuntary phases
•
12. Anatomy of speech and swallowing
Sunday, 15 October 2017
5:02 PM
ANAT102 Page 1
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Document Summary
Shared space between the respiratory and the digestive tracts. Begins at back of nose, extends to bottom of larynx (voice box) Lies behind and communicates with nasal cavity (nasopharynx), oral cavity (oropharynx) and larynx (laryngopharynx) 12. 2 divide the pharynx into its component sections: From posterior nostril to tip of soft palate. Tip of soft palate to tip of epiglottis. Tip of epiglottis to lowest edge of larynx. Muscular walls function in the process of swallowing. A pathway for the movement of food from the mouth to the oesophagus. 12. 4 describe the musculature of the pharynx longitudinal muscles. Important sensory distribution as it sends messages back to the brain about what you are swallowing. Too hot- triggering a hot reflex, sharp object, or needs more chewing etc. circular muscles. 12. 5 describe the sensory and motor nerve supply of the pharynx. Motor nerve supply of muscles of the pharynx. Sensory supply of lining of the pharynx -> vagus nerve (x)
