APC_100_GI_part_3

APC_100_GI_part_3 - The Fish Digestive Tract The digestive...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The Fish Digestive Tract The digestive tract of some fish looks much like a simple tube with little modification. However, many boney fish have a more elaborate stomach with ceca. Fish lack a muscular tongue and have a common oropharynx. The esophagus is typically very short. In fish with swim bladders, a pneumatic tube comes off the esophagus and leads to the air bladder. The air bladder helps the fish to maintain neutral buoyancy. The esophagus empties into the stomach. There can be a variety of stomach morphologies as described above. Some fish also have multiple ceca branching off the pyloric region of the stomach. The fish intestine is not divided into small and large portions. Histology of the Fish Digestive Tract Oropharynx: Teeth may be distributed throughout the oropharynx, on the jaws, tongue, palate, and brachial arches. They tend to be directed inward a are used for biting and anchoring prey. All teeth boney fish tend to be the same conical shape (homodont). Teeth of sharks are also homod tend to be triangular in shape and have serrated edges. Fish, which feed on shellfish, have flattened tooth plates used to crush their prey. They also have keratinized epithelia in the oropharynx to pr underlying tissue. Keratinization in the di tracts of other types of fish is rare. nd in ont, but otect gestive
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Liver The liver is an organ directly associated with processing material absorbed by the GI tract. In mammals it is located in the abdominal cavity, typically immediately caudal to the diaphragm. The diaphragm separates the abdominal and thoracic cavities. The liver consists of one or more lobes depending on the species. In
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/20/2010 for the course NPB NPB123 taught by Professor Meyers during the Winter '10 term at UC Davis.

Page1 / 4

APC_100_GI_part_3 - The Fish Digestive Tract The digestive...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online