Gastrointestinal system - week 8 Flashcards
which type of epithelium are the tongue and mouth covered in?
stratified sqaumous
name the 3 salivary glands
parotid, submandibular and sublingual
which salivary gland secretes serous saliva and which secretes mucous saliva?
parotid = serous
sublingual = mucous
where in the saliva glands is saliva produced by the active filtration of ions from blood?
acini
what type of saliva is produced by para and sympathetic stimulation?
para = large volume, watery
sympathetic = small volume, mucous
name the 7 functions of saliva
lubrication
digestion
protection of oral mucosa through lubrication
antibacterial
thirst stimulation
speech
absorption in mouth
what in saliva aids lubrication?
mucins
what in saliva aids digestion?
alpha amylase
how does the saliva protect oral mucosa ? 3 ways
lubrication, rinsing action and alkaline pH
which molecule makes saliva antibacterial?
antimicrobial thiocyanate
which 2 muscles aid pulverisation and bolus fomation?
tongue and buccinator in cheeks
name the 4 muscles of mastication
temporalis
masseter
lateral pterygoid
medial pterygoid
the muscles of mastication move which bone, bringing it into contact with the teeth connected to which bone? what is the name of the joint which moves?
mandible, maxilla, temporomandibular joint
which muscles of mastication sit deep?
pterygoids
which is the major effector muscle of mastication?
temporalis
which fibres of the temporalis can retract the jaw if it has been protruded?
posterior
which muscle of mastication elevates and protrudes the lower jaw
masster
which muscles of mastication help protrude the lower jaw unilaterally - moving it side to side?
medial and lateral pterygoids
what happens in the next step after the bolus is pushed to the back of the pharynx, triggering the swallowing reflex in the pharyngeal stage of swallowing?
the soft palate rises to block off the nasopharynx
what happens after the soft palate rises to block off the nasopharynx in the pharyngeal stage of swallowing?
elevation of the larynx moves the epiglottis over the trachea
in the elevation of the larynx to move the epiglottis over the trachea, which muscles lift the larynx to close off the trachea?
suprahyoid muscles
what happens after the elevation of the larynx to move the epiglottis over the trachea in the pharyngeal stage of swallowing?
the pharyngeal constrictors contract sequentially to push the food down the pharynx and into the oesophagus
at which vertebral level does the oesophagus pass through the diaphragm?
T10
what is the type of epithelium which lines the oesophagus?
stratified squamous
which third of the oesophagus is skeletal muscle which two thirds are smooth?
upper third is skeletal, lower 2 are smooth
what happens in a hiatus hernia?
when the upper part of the stomach squeezes through the oesophageal hiatus causing reflux of stomach contents into the oesophagus
what is the name of the opening where the stomach opens into the duodenum
pyloric orifice
where is the fundus of the stomach?
the top, above the greater curvature
where is the pyloric antrum of the stomach?
at the bottom by where the pyloric sphinchter opens into the duodenum
where is the cardia of the stomach?
where the oesophagus joins the stomach
the fundus and body of the stomach secrete acid from which type of cells? and what do peptic/chief cells secrete?
parietal, pepsin precursor and pepsinogen
what are the 3 endocrine secretions from the antrum of the stomach?
gastrin, histamine, somatostatin
what is the type of epithelium lining the stomach? what type of junctions connect it?
columnar, tight
which type of cells secrete alkaline mucous in the stomach’s gastric muscoa? what does this prevent and provide?
mucous cells, damage to tissue from acid secretions and a mechanical barrier to pathogens
what are the 3 muscle layers of the stomach?
circular, longitudinal and oblique
name the 4 parts of the duodenum and which vertebral level they travel at
superior = L1
descending = L3
horizontal = L3
ascending = L2
name the 3 parts of the small intestine
duodenum, jejunum and ileum
which structure anchors the jejunum and ileum to the posterior body wall?
mesentery