swallowing :) Flashcards
what is deglutition
action of preparing food within oral cavity and transmitting the bolus from OC through pharynx and oesphagus
phases of swallowing
oral phase
pharyngeal phase
oesophageal phase
what are the phases e.g. oral is …
oral - voluntary
others - reflexes i.e. cannot be stopped
Oral preparatory phase
preparation of food by mastication, mixing with saliva
how is the consistency of food monitors by
sensory receptors in the oral mucosa so no choking occurs
oral transit phase
oral cavity occluded by raising the tongue to the palate from front to back
back of tongue lowered
backwards movement pushes food down oesophagus
extrinsic muscles of the tongue
palatoglossus
genioglossus
styloglossus
hyloglossus
palatoglossus
one of the arches in the mouth
muscle of the palate and tongue
genioglossus and styloglossus functon
used to form a Shute to propel food back
trigger points in the mouth
palatoglossal arch
soft palate
posterior wall of pharynx
palatine tonsil?
contact with trigger point leads to
reflex pharyngeal contraction
reflex actions to protect lower airway
what must happen for oral phase to complete
mouth closed
- uses jaw elevation branch V3
- lip muscles of facial expression (CNVII)
what happens when the mouth is closed (muscles)
fixes the hyoid bone and suprahypid muscles to allow raining of larynx and pharunx
transit phase
elevation of soft palate to stop food entering the nasopharynx and nose
suspension of respiration to minimse inhalation of food into larynx
muscles of soft palate
palatoglossus
palatopharyngeus
levator veli palatini
tensor veli palatini
palatoglossal
muscle of palate and tongue
anterior arch in oral cavity
palatopharyngeal
posterior arch in oral cavity
what do the arches in the OC do
depress the soft paalte
levator veli palatini/tensor veli palatini
elevatee soft palate to close off nasopharynx
nerve supply to muscles of palate
vagus
except tensor veil palatine - trigeminla V3 branch
actions of the pharyxn
passage of food through pharynx
protection of lower airway to prevent food inhalation
how is the lower airway protected
suspension of respiration
elevation of larynx ny suprahyoid muscles (fix hyoid bone so larynx can elevate)
narrowing of laryngeal entrance
strong adduction of vocal folds
laryngeal elevation process
opens pharynx
pulls larynx under tongue
epiglottis flaps over laryngeal entrance
epiglottis
elastic cartilage
protects laryngeal entrance
convex laterally