digestive system ii. -...
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Digestive system II.
Morphology
© David Kachlík 30.9.2015
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Digestive tube
Oesophagus
Stomach
Small intestine
Large intestine
Rectum
Anus
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Oesophagus
pars cervicalis,
thoracica, abdominalis
constictions: 3
permanent + 2
temporary
position: relation to
trachea, aorta, vertebal
column, ductus
thoracicus
topography: superior +
posterior mediastinum© David Kachlík 30.9.2015
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Oesophagus – blood supply
Arteries:
– a. thyroidea inf.
– arcus aortae + aorta thoracica and their branches
– a. gastrica sin.
Veins: vv. oesophageales
– vv. thyroideae inf.
– v. azygos + hemiazygos + hemiazygos acc.
– vv. gastricae breves
portocaval anastomosis – varices
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Oesophagus – Lymph and Nerves
Lymph: nodes or directly into ductus thoracicus
– n.l. cervicales prof.
– n.l. juxtaoesophageales + paravertebrales (= n.l.
mediastinales post.)
– n.l. gastrici sin.
Nerves: n.X – plexus oesophageus – left anteriorly
(rotation 90 degrees !) – parasympathetic
– truncus symphaticus – sympathetic + sensory
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Oesophageus – wall structure
– stratified squamous nonkeratinising epithelium
– lamina propria mucosae – distally oesophageal
cardial glands
– in submucosis mucinous glands - gl.
oesophageae
– proximally skeletal musculature
– adventitia
• serosa on the short abdominal part only
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Oesophagus – examination
endoscopy – rigid and flexible
– Kilian´s – 15 cm from teeth
– transition to stomach - 40 cm from teeth
X-ray – contrast with baryum
oesophageal manometry
pH-metry
oesophageal echocardiography
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Sites with weakened wall
trigonum Killiani
– cranially: m. thyropharyngeus (m. constrictor ph. inf.)
– caudally: m. cricopharyngeus (m. constrictor ph. inf.)
– diverticulum of Zenker (= pharyngo-oesophageal diverticle; dehiscence of Killian)
trigonum Laimeri
– cranially: m. cricopharyngeus
– caudally: upper oblique fibres of longitudinal muscle layer of oesophagues
area Killian-Jamieson
– at lateral side of oesophagus
– diverticulum of Killian-Jamieson
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© David Kachlík 30.9.2015
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© David Kachlík 30.9.2015
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Oesophagus – diseases
gastroesophageal reflux
hernia in hiatus oesophageus
varices
diverticles – pulsatory (of
Zenker), traction (of
Rokitansky)
tumors – stent, colon
reposition
lye/acid – mediastinitis© David Kachlík 30.9.2015
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Oesophageus - HE
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Stomach = gaster (ventriculus, stomachus)
paries anterior + posterior
curvatura major + minor
cardia, fundus /fornix/, corpus /canalis/,
pars pylorica (antrum, canalis, pylorus)
incisura angularis
ostium cardiacum + pyloricum
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Stomach
shape: hook, spindle, bull horn
position: Th11-L3
projection: Labbé´s
topography: organ impressions
relation to peritoneum: intraperitoneally
suspended with: omentum majus + minus,
bursa omentalis (= lesser sac)
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Impaired
branches of
the aorta
abdominalis
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Stomach – arterial supply
truncus coelicacus
aa. gastrica sin.
a. hepatica communis
– a. hepatica propria a. gastrica dx.
– a. gastroduodenalis a. gastroomentalis dx.
a. splenica a. gastroomentalis sin., aa.
gastricae breves (fundus), a. gastrica posterior
(variability)
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Stomach – other supply
Veins: correlate to arteries + v. prepylorica v.
portae
portocaval anastomosis between v. gastica sin. and vv.
oesophageales varices
Lymph: n.l. gastrici, gastroomentales, pylorici,
splenici, pancratici n.l. coeliaci
Nerves: parasympathetic – n. X
sympathetic – nn. splanchnici major+minor ggl.
coeliacum + mesentericum sup.
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Stomach – wall structure
tunica mucosa
– plicae gastricae (sulcus salivatorius Waldeyeri)
areae gastricae foveolae gastricae
– simple columnar epithelium – mucous production
– lamina propria mucosae
• gastrical glands, lymphatic follicles
tunica muscularis
– inner - fibrae obliquae
– medial - circular - m. sphincter pylori
– outer - longitudinal
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Tunica mucosa of gaster
gastric pits
• deeper in pyloric part
• glands enter these pits
– gl. cardiacae - deep
– gl. gastricae propriae
– gl. pyloricae - shallow
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Gastric cells
main cells - pepsinogen, lipase
parietal cells - HCl, intrinsic factor
• abundant intracellular channels
mucinous cells – mucus
enteroendocrine cells (DNES) - gastrin,
somatostatin
undiferentiated cells - mitotically active
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Synthesis of HCl
in parietal cells
Cl- - from plasma
H+ - from H2CO3
– by carboanhydrase from CO2 and H2O
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Cardia gastri - HE
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Fundus gastri - HE
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Stomach – examination + diseases
peptic ulcer
gastritis A,B (Helicobacter pylori)
tumors
pylorostenosis
gastroscopy
X-ray – contrast with baryum
gastrostomy
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Break
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Small intestine = Intestinum
tenue
duodenum
jejunum
ileum
mesenterium
- radix mesenterii
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Tunica mucosa of small intestine
plicae circulares (Kerkringi) villi
intestinales microvilli
glandulae intestinales = Lieberkühn´s crypts
simple columnar epithelium
lamina propria mucosae
– vessels, smooth muscles, noduli lymphoidei
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Cells of small intestine
mucosa
enterocytes - resorption
– microvilli, interdigitations, lipid droplets
goblet cells – mucus production
Paneth cells – lysozym production
endocrine cells (DNES) - 12 types
– cholecystokinin, sekretin
M-cells - over noduli lymph. aggregati (Peyer‘s plates)
undiferentiated cells
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Villi intestinales
digit- to leaf-formed elements
about 10times surface enlargement
surface – enterocytes, goblet cells
smooth muscle „skeleton“
capillary network
lymphoid (=lacteal) inhte centre
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Other layers of small intestine wall
tela submucosa
– duodenum – glandulae duodenales Brunneri
• tuboalveolar mucinous
• alcalic secretion
– ileum – noduli lymphoidei aggregati („agmina Peyeri“) = Peyer´s plates
• accumulation of lymphoid tissue
other layers correnspond to the standard form of the tube
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Duodenum
pars superior
– ampulla=bulbus
flexura duodeni sup.
pars descendens
flexura duodeni inf.
pars horizontalis/inferior
pars ascendens
flexura duodenojejunalis
secondary retroperitoneally /except ampulla/© David Kachlík 30.9.2015
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Duodenum
structure: plica longitudinalis
– papilla d. major Vateri
– papilla d. minor Santorini
fixation: lig. + m. suspensorius Treitzi d.
position: duodenal window L2
plicae ciculares Kerckringi – highest of the intestine
glandulae duodenales Brunneri
– submucosal
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Duodenum – blood supply
truncus coelicacus a. hepatica communis
a. gastroduodenalis a. pancreaticoduodenalis
sup. post. + sup. ant. + aa. retroduodenales
a. mesenterica sup. a. pancreaticoduodenalis
inf. ramus ant. + r. post.
Veins: vv. pancreaticoduodenales v.
mesenterica sup. v. portae
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Duodenum – Lymph and
Nerves
Lymph: n.l. pylorici
n.l. hepatici n.l. coeliaci n.l. preaortici
down directly to n.l. preaortici
Nerves: parasympathetic – n. X
sympathetic – nn. splanchnici major+minor
ggl. coeliacum + mesentericum sup.
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Transition: Pylorus -
Duodenum HE
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Duodenum - HE© David Kachlík 30.9.2015
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Jejunum et ileum
6 differences: content, width, folds, lymphoid
tissue, vessels density and arrangement
wholly intraperitoneally, radix mesenterii
ostium ileale Bauhini s. Tulpi (former valva
ileocaecalis !) – labrum sup. + inf.
diverticulum ilei Meckeli (2%) – remnant of
ductus omphaloentericus
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Jejunum + ileum - supply
arteries: a. mesenterica sup. aa.
jejunales + ileales + aa. ileocolica
arkády (parallel Dwigth´s artery
arteriolae rectae
Veins: correspon to arteries
Lymph: 3 rows of n.l.mesenterici sup.
Nerves: n. X + sympathetic
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Small intestine - HE
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Small intestine - diseases
duodenal ulcer
inflammation – morbus Crohn, colitis
ulcerosa
tumors – very rare – carcinoid
coeliakia
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Large intestine = Intestinum
crassum
caecum + appendix vermiformis
colon ascendens, transversum, descendens, sigmoideum
rectum
canalis analis
flexurae coli dx.+ sin.
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Large intestine - arteries
a. mesenterica sup.
– a. ileocolica a. ceacalis ant. + post., a. appendicularis
– a. colica dx. (colon ascendens)
– a. colica media (colon transversum)
a. mesenterica inf.
– a. colica sin. (pro colon descendens)
– aa. sigmoideae (3-4)
arteria marginalis Drummondi
anastomosis magna Halleri = arcus Riolani
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Large intestine – other supply
Veins: correspond to arteries v. portae
Lymph: 3 rows of n.l. colici n.l. preaortici
Nerves:
– parasympathetic: n. X down to flexura coli sin. (=
Cannon-Böhme´s ), then sacral parasympathetic
(S2-4)
– sympathetic: z ggl. coeliacum, mesentericum sup.
+ inf.
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Mucosa of large intestine
plicae semilunares
no villi
deeper Lieberkühn´s crypt
– enterocytes – less of microvilli
– goblet cells are numerous
– Paneth cells are missing
– endocrine cells (DNES) are present
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Other layers of large intestine
wall
tunica muscularis externa
– inner circular - haustrations
– outer longitudinal – reduced to taenie coli
• mesenterica
• omentalis
• libera
• besides appendix and rectum !
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Large intestine - tunica serosa
Fixation and relation to peritoneum
intraperitoneal: appendix, colon transversum +
sigmoideum - having their meso-
mesoperitoneal: colon ascendens + descendens – half-
grown with the posterior wall
rectum – partially intraperitoneal + subperitoneal
caecum – variability – see picture
appendices omentales • adipose tissue
• unclear function
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Large intestine - HE
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Caecum
papilla et ostium ileale Bauhini s. Tulpi (frenulum, labrum)
intraperioneally, often no mesocaecum
appendix vermiformis: 2-30 cm, mesoappendix, ostium, lig. appendiculoovaricum Cladoi
6 positions: positio pelvina, retro-, pre-, sub-, latero- et ileocaecalis /most frequent positio retrocaecalis/
projection: McBurney´s (on Monro´s line) and Lanz´s point (on linea interspinosa)
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Appendix vermiformis caeci
Paneth cells are present
lamina propria mucosae
– fulfilled with lymphatic tissue = noduli lymphoidei
aggregati („tonsilla abdominalis“)
longitudinal musculature forms no taenia
– circular one strongly reduced
Amyand´s hernia – appendix in sac of inguinal
hernia
– Claudius Amyand, 1735 – physician to George II.
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Appendix vermiformis - HE
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Rectum
description: ampulla, flexura sacralis et laterales (superodextra lat., intermedisinistra lat., inferodextra lat.),
structure: plicae transversae
– plica dx. Kohlrauschi
– plicae sin. sup. + inf. Houstoni s. Nelatoni
longitudinal musculature forms no taenia
lig. recti lat.
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Canalis analis
description: flexura anorectalis = perinealis, anus
structure: columnae, valvulae, sinus, lineae
anocutanea et pectinata, pecten, zona
transitionalis
muscles: m. sphincter ani ext. et int.
peritoneum: on upper ¼ only = partially
intraperitoneal + subperitoneal organ
psition: septum rectovesicale♂/rectovaginale♀,
fossa ischioanalis
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Rectum + canalis analis –
blood vessels
a. mesenterica sup. a. rectalis sup.
a. iliaca int. a. rectalis media
a. iliaca int. a.pudenda int. a. rectalis
inf.
Veins: plexus venosus rectalis correspond
to arteries possible portocaval
anastomosis
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Rectum + canalis analis –
Lymph and Nerves
n.l. mesenterici inf. n.l. preaortici
n.l. iliaci int.
n.l. sacrales
n.l. inguinales superficales
Nerves: - sacral parasympathetic
– sympathetic by plexus hypogastricus sup. + inf.,
n. pudendus
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Canalis analis - structure
zona haemorrhoidalis - m. sphincter ani int.
– columnae anales (6-10)
– change of epithelium – stratified squamous
nonkeratinising
– Anal venous plexus – „cavernous body“ –
maintains continention inner
haemorrhoids
zona cutanea – keratinising epithelium
– glandulae circumanales (sweat and apocrine)
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Large intestine - examination
Hemokult – hidden bleeding examination
endoscopy – rectoscopy (rigid), coloscopy
(flexible)
X-ray- native, contrast - passage,
irigography
CT
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Large intestine - diseases
polyps
tumors – most frequent !!!
diverticulosis diverticulitis (Graser´s diverticle)
inflammation – colitis ulcerosa, morbus Crohn
appendicitis – „the sun may not rise or fall“
– most frequent sudden abdominal accident
internal / external haemorrhoids
colostomy – temporary / permanent
© David Kachlík 30.9.2015