Digestive System Flashcards
Bringing of swallowed food up again to the mouth
Regurgitation
Physical and chemical breakdown of feeds as they pass through the gastrointestinal tract
Digestion
Physical reduction of particle size (chewing)
Mastication
Act of swallowing
Deglutition
Accessory organs of digestive system (4)
Liver
Gallbladder
Pancreas
Salivary glands
Major structures of digestive system
Oral cavity
Pharynx
Larynx
Esophagus
Stomach
Small intestines
Large intestines
Used primarily for grinding food and mixing it with saliva
Oral cavity
3 parts of teeth
Crown
Neck
Root
Part of teeth that is embedded in the tooth socket
Root
Part of teeth found at the gum line
Neck
Part of teeth that protrudes above the gum line
Crown
3 types of teeth growth
True teeth
Constantly growing teeth
Constantly erupting teeth
Examples of constantly growing teeth
Tushes of pig & incisor teeth of rodents
Teeth that do not possess a definite neck or root; grow from persistent active pulp
Constantly growing teeth
Teeth that possesses extremely long root and no definite neck; filling in of bone pushes the teeth out of the socket to compensate for the wear; cheek teeth
Constantly erupting teeth
All teeth are similar
Homodont dentition
All teeth have gone differentiation - incisors, canine, molars, premolars
Heterodont dentition
When several primitive cones come together to form one tooth
Bunodont dentition
Example of bunodont dentition
Cheek teeth of a pig
Animal with homodont dentition
Dolphin
When the cones of teeth become ridges
Lophodont dentition
High-crowned teeth extending past the gum line, providing extra wear and tear
Hypsodont teeth
When the ridges of teeth becomes sharp
Selenodont dentition
Foliate papillae are present in horse, pig, and dog, but not in:
Ruminants
Most numerous of the lingual papillae
Filiform papillae
One of the sparsely scattered elevations on the tongue, often considered to be modified filiform papillae
Conical papilla
Common passage for food and air
Pharynx
Muscular tube extending from the pharynx to the stomach
Esophagus
3 divisions of esophagus
Cervical
Thoracic
Abdominal
Muscular ring, separates the stomach from the esophagus
Cardiac sphincter
Strong annular muscle, at the junction of the stomach and duodenum
Pyloric sphincter
Allow the stomach volume to expand to accommodate meals
Gastric folds
Depression created by deep infoldings of the columnar epithelium of the tunica mucosa
Gastric pits
Covers the outer surface of the stomach
Serosa
Layer of the stomach that contains vessels and nerves
Submucosa
The smaller glandular portion of the stomach in the ruminant
Abomasum
Honey comb; smallest section of stomach (ruminants); acts as a liquid reservoir to soften heavy matter in food
Reticulum
Largest part of the adult stomach (ruminant); fermentation; a site of bacterial digestion and an organ of absorption
Rumen
Grinds food more finely and absorb excess moisture (ruminant)
Omasum
Grinds food more finely and absorb excess moisture (ruminant)
Omasum
True stomach (ruminant); secretes gastric enzymes and hydrochloric acid
Abomasum
Tube connecting the stomach to the cecum and large intestine
Small intestine
Forms the mesentric part of the intestine
Jejunum
Reabsorbs the water and electrolytes
Villi
[ Crypt of lieberkuhn] secretes mucus for lubrication and protection
Goblet cells
[ Crypt of lieberkuhn] secrete water and electrolytes
Enterocytes
[ Crypt of lieberkuhn] secrete antimicrobial peptides
Paneth cells
Cul de sac, blind sal situated between the ileum and great colon
Cecum
Terminal part of the intestine and is found in the pelvic cavity
Rectum
Terminal part of the alimentary tract; continuous with the skin
Anus
Retracts the partial prolapse that the anus undergoes during defecation
Retractor ani
Tethers the liver to the ventral midline
Falciform ligament
Connecting the liver and proximal duodenum
Hepatoduodenal ligament
Parts of the peritoneum connecting the stomach with other structures
Omentum
Provides digestive enzymes, provides lubricative and cleansing functions
Salivary glands
Largest gland in the body
Liver