Zoology Lab: Digestive System

• Alimentary tract - continuous tube running from mouth to anus.
• Alimentary tract - composed of mouth, pharynx, esophagus, stomach, small intestine, large intestine
• Accessory organs - teeth, tongue, liver gallbladder and pancreas.
• Maxillary teeth. These are a row of small teeth along the margin of the upper jaw.
• Sulcus marginalis. This is a pair of grooves on the inner side of the maxillary teeth that receives the lower jaw when the mouth is closed.
• Median subrostral fossa. It is a prominent depression of the sulcus marginalis at the anterior tip of the upper jaw.
• Lateral subrostral fossa. It is a pair of depressions of the sulcus marginalis
• Pulvinar rostrale. It is a pair of low elevations on each side of the median subrostral fossa.
• Internal nares.  is a pair of slit-like openings above the eyeballs leading to the external nares.
•  Eyeball prominence. These are two large rounded bulges of the eyeball.
• Vomerine teeth. These are fine teeth projecting from the vomers in between the internal nares.
• Opening of Eustachian tube. It is a pair of slit-like openings found medial to the angles of the jaw.
•  The eustachian tube leads to the cavity of the middle ear.
• Prelingual fossa. These are two shallow depressions on each side of tuberculum prelinguale.
• Tuberculum prelinguale. A prominent median elevation at the tip of the lower jaw. This fits into the median subrostral fossa when the mouth is closed.
• Tongue. It is a forked muscular organ attached to the anterior tip of the lower jaw.
• Opening of vocal sac. This is a pair of slit-like opening on the floor of the mouth close to the angle of the jaw; found only in male frogs.
• Opening of esophagus. It is a large transverse slit, posterior to the laryngeal prominence.
• Laryngeal prominence. Circular elevation anterior to the esophageal opening.
• Glottis. It is a short vertical slit like opening at the center of the laryngeal prominence.
• Pharynx. It is the posterior portion of the buccal cavity which opens into the esophagus.
• Esophagus. It is a very short tube that connects the pharynx to the stomach.
• Stomach. A large whitish organ with either "U" or "J" shaped enlarged portion of the digestive tube.
• Pylorus. This is a constriction at the posterior end of the stomach.
• Spleen. This is a dark red organ located on the left lateral side of the stomach. It is considered part of the lymphatic system.
• Gall bladder. This is a small greenish sac located at the ventral part of the median lobe of liver.
• Small intestine. This is slender and the longest portion of the tube which is irregularly coiled;
• The small intestine is suspended from the dorsal body wall by the mesenterium.
• Large intestine. This is a short dilated tube at the terminal end of the spleen is also suspended.

  ileum.
• Large Intestine. It is suspended by the mesorectum, where a rounded reddish