Tongue, Pharnyx, Oesophagus and stomach Flashcards
What are the extrinsic muscles of tongue?
Styloglossus
Hyoglossus
Genioglossus
where does styloglossus orginate?
styloid process
where does hyoglossus originate?
hyoid bone
where does genioglossus originate?
superior genial tubercles
what does styloglossus do
pulls tongue posterosuperiorly
what does hyoglossus do?
pulls tongue inferiorly
what does genioglossus do ?
pulls tongue anteriorly
what are intrinsic muscles of tongue?
Longtidunal
Vertical
Transverse
what does longitudinal muscles bundle into?
superior and inferior bundles
what does superior bundle do?
moves tip up
what does inferior bundle do
pulls tip inferiorly
what does vertical muscle do?
- thins tongue in superoinferior axis
- tongue flattens
- tongue widens along mediolateral and anteroposterior axis
What does transverse muscle do?
make tongue narrow, longer and thinner
What nerve supplies motor impulses to tongue muscles?\
Hypoglossal nerve, CN 12
How is tongue divided?
into anterior 2/3 and posterior 1/3
v shaped boundary on tongue?
Sulcus terminalis
Islands on tongue?
Circumvallate papillae
what is a branch of facial nerve?
Chorda tympani
what do taste fibres initially travel in?
lingual nerve
what is the lingual nerve a branch of?
posterior trunk of mandibular division of CN5
what is sensory innervation to 2/3 tongue?
chorda tympani branch of CN7
what is sensory innervation to posterior 1/3 of tongue?
supplied by Glossopharyngeal nerve. CN9
What does branches of CN9 carry to tongue?
taste and sensory fibres
what regions is pharynx divided into?
Nasopharynx, Oropharynx and laryngopharynx
where is nasopharynx?
posterior to nasal cavity
where is oropharynx?
posterior to oral cavity
where is laryngopharynx?
posterior to larynx
what are the outer muscle layers of pharynx?
superior, middle and inferior constrictor
where are 3 outer muscles fused?
at median pharyngeal raphe to form outer layer
Where does superior constrictor originate ?
pterygomandibular raphe to mylohoid line of mandible
where does superior constrictor insert?
into median pharyngeal raphe and attaches to base of skull
where does middle constrictor originate?
hyoid bone
where does middle constrictor insert
median pharyngeal raphe, overlaps inferior part of superior constrictor
where does inferior constrictor originate?
external surface of larynx
where does inferior constrictor insert?
median pharyngeal raphe, overlaps inferior part of middle constrictor
what is continuous with superior constrictor?
buccinator at pterygomandibular raphe
what are INNER longitudinal muscles of pharynx ?
Salpingopharyngeus
palatopharyngeus
stylopharyngyeus
where does Salpingopharyngeus originate?
auditory tube, eustachian
where does palateoharyngeus originate ?
hard and soft palates
where does stylopharyngeus originate?
styloid process
what nerve is stylopharyngues supplied by
Glossopharyngeal nerve
what do inner muscles of pharynx do?
elevate pharynx
What is oesophagus muscle arrangement?
outer muscle layer is longitudinal
inner muscle layer is circular
where does oesophagus receive blood supply ?
thoracic aorta
where does de02 blood from oesophagus drain into?
gastric veins then into liver
