Digestive System Flashcards
List the three possible layers of the tunica mucosa.
3 layers of tunica mucosa
- inner epithelium
- middle lamina propria
- thin outer muscularis mucosae
List two plexuses found in some tubular viscera.
Cranial and caudal myenteric plexus
List the components of the digestive system.
- oral cavity
- teeth
- esophagus
- stomach
- small intestine
- large
- colon
- rectum
- anus
List the salivary glands and their secretions.
major salivary glands
- parotid gland- serous
- sublingual gland- mixed
- submandibular gland- mixed
Function of Gastrointestinal system (5)
Function of Gastrointestinal system
Prehension: ingestion followed by fragmentation
Mechanical and enzymatic breakdown of nutrients
Absorption
Synthesis/Secretion
Excretion of waste material
Identify



These projections are called the VILLI

Oral Cavity
Oral Cavity
- Formed by lips and cheeks and palate, pharynx, tongue
- mucosa lined by stratefied squamous epithelium
- lamina propria of connective tissue
- **dental pad in ruminants


Tongue
Tongue
- covered by mucosa
- papillae ore the bumbs
- sone papillae have taste buds
- skeletal muscle!
- longitudinal
- transversal
- vertical


Teeth
Teeth
- Hard structures
- enamel produced by ameloblasts
- dentin beneath is produced by odontoblasts
- cementum
- Soft tissues
- pulp
- peridontal ligament

layers of tooth









4 tunics of digestive organs
4 tunics of digestive organs
- Mucosa
- inner epithelium
- middle lamina propria
- thin outer muscularis mucosae
- Submucosa
- Muscularis
- inner circular
- outer longitudinal
- Serosa







myenteric plexus
myenteric plexus
- part of tunica muscularis
- nervous tissue
- neuron cell bodies that control glands and smooth muscle

esophagus
esophagus
- lined by stratefied squamous epithelium
- mucus glands
- heals poorly

Identify




Stomach

Complex stomach of ruminants


Identify


Identify


Identify


Glandular stomach
Glandular stomach
- abomasum is only true stomach in ruminants
- three glandualar regions in all species
- cardiac
- fundic
- pyloric

Identify


Three types of gastric glands

Identify


Cells of fundic region

Identify


Flow chart intestine

Small intestine
Small intestine
- goblet cells
- plicar, villi, microvilli
- submucosal glands in duodenum
- lymphatic nodules in distal small intestine
- myenterix plexus and submucosal plexus

Identify

Parvo virus- effects the crypts of lieberkuhn. causes colapse of surface epithelium.

Identify



YOU know its small intestine because it has submucosa

Identify


Identify pink cell


IDentify brown cell


Large intestine
Large intestine
- NO VILLI
- intestinal crypts
- pigs and horses have flat bands called taenia coli
- innervated via vagus nerve

How to distinguis different parts of the intestine?

Rectum and anus

Identify




Identify


Saliva
Saliva
- contains water salts enzymes
- digestive function but also lubrication and immunity
- MAJOR glands
- parotid
- sublingual
- submandibular
- MINOR glands
- lingual
- palatal
- labial
- buccal
- zygomatic
- molar
- Secretions- serous, mucous, mixed

large salivary glands
(key features flow chart)

Identify

mixed(pink) and mucous(white) salivary glands
Liver
Liver
- capsul of Glisson= mesothelium layer covring each lobe
- organized into lobules
- hepatocytes are parenchymal cells arranged in plates with adjacet sinusoids
- plates are organized into hepatic lobules
blood circulation of liver





Hepatic acinus
hepatic acinus refers to VASCULAR FLOW PATTERN.
- begins at triad flows towarts central veins
- hepatocytes nearest central vein recieve blood lowest in o2= first to be damaged if issue occurs
zone 1= high o2 and nutrients
zone 2= moderate o2 and nutirents
zone 3= low o2 and nutrients

pancreas
pancreas
- endocrine (5%)
- islets of langerhans
- exocrine (95%)
