WILD 3580 1st Edition Lecture 22Outline of Last Lecture I. SkinII. Circulatory System III. Feeding and Digestion IV. Teeth Outline of Current Lecture I. Tooth AttachmentII. Fangs and VenomIII. Venom Components IV. Antivenin Current LectureI. Tooth Attachment1. Acrodont- teeth sit on top of the jawa. Most lizards, some snakes 2. Pleurodont- attached to the side of the jawa. Some lizards, some snakes3. Thecodont- teeth are set in sockets a. Crocodilians II. Fangs and Venom - Only snakes - In the Order Heloderma for lizards (only venomous lizards in the world)o Gila monstero Beaded lizard No fangs - Fang Typeso Fangs: pair of enlarged teeth in the upper jaw used to deliver venom 1. Aglyphous- lack of fangs a. Mostly in the Family Colubridae These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.b. Same size, same shape (recurve homodont dentition)c. Function: grasp and hold prey 2. Opisthoglyphous- rear fangs a. Slightly elongate in the rear of mouthb. Family Colubridae c. Not as effective 3. Proteroglyphous- fixed front fangs a. Family Elapidae b. Grooved or hollow c. Fixed fangs fit into lower jaw pockets when mouth is closed 4. Solenoglyphous- hinged front fangs a. Family Viperidae b. Hollow c. Allows maxilla to rotate outward when mouth is open- Venom or Poison? o Venom is toxin injected Advantages – safer, saves energy, eat larger prey, aids in digestion o Poison is toxin ingested III. Venom Components - Enzymes: break things down - 2 general classes1. Neurotoxins- attack the nervous systems by interfering with neuromuscular transmission a. Target the heart and/or diaphragm 2. Hemotoxins- attack the circulatory system by breaking down red blood cells kill tissues a. Mostly Family Viperidae - 8,000 snake bites yearly in the U.S (mostly from W. Diamondback Rattlesnake)IV. Antivenin- Region or species specific - Hesitant to give antivenin - Many hospitals don’t have many (short shelf
View Full Document
Unlocking...