Lizard anatomy quiz

WIKIQUIZ

1

Some lizards have a parietal eye which plays a role in ...? nocturnal vision olfaction hormone regulation peripheral vision menace response Please select an option Incorrect! Although sensitive to changes in light, the parietal eye cannot form images. WikiVet Article: Lizard Eye. Incorrect. The parietal eye is a sensory organ connected to the central nervous system and the pineal gland by the small parietal nerve; it functions in hormone production (including reproduction) and thermoregulation. WikiVet Article: Lizard Eye. Correct! The parietal eye is a sensory organ connected to the central nervous system and the pineal gland by the small parietal nerve; it functions in hormone production (including reproduction) and thermoregulation. WikiVet Article: Lizard Eye. Incorrect. Although sensitive to changes in light, the parietal eye cannot form images. WikiVet Article: Lizard Eye. Incorrect. The parietal eye is a sensory organ connected to the central nervous system and the pineal gland by the small parietal nerve; it functions in hormone production (including reproduction) and thermoregulation. WikiVet Article: Lizard Eye.

2

Injecting lizards with nephrotoxic drugs could potentially result in increased renal toxicity because...? lizards have a three chambered heart. the venous return from the tail and hindlimbs isn't filtered through the kidneys. reptiles are extremely sensitive to nephrotoxic drugs. the venous return from the tail and hindlimbs isn't filtered through the liver. of the renal portal system Please select an option Incorrect! Lizards do indeed have a three chambered heart; however this does not explain the increased renal toxicity. The reason is that reptiles have a renal portal system where venous return from the tail and hindlimbs may be filtered through the kidneys to bathe the renal tubules. Therefore the injection of drugs that are cleared via tubular excretion into the caudal half of the body could result in lower than anticipated serum concentration because of their excretion in the urine before entering the systemic circulation. WikiVet Article: Lizard Cardiovascular System Incorrect! Reptiles have a renal portal system where venous return from the tail and hindlimbs may be filtered through the kidneys to bathe the renal tubules. WikiVet Article: Lizard Cardiovascular System Incorrect! The reason is that reptiles have a renal portal system where venous return from the tail and hindlimbs may be filtered through the kidneys to bathe the renal tubules. Therefore the injection of drugs that are cleared via tubular excretion into the caudal half of the body could result in lower than anticipated serum concentration because of their excretion in the urine before entering the systemic circulation. WikiVet Article: Lizard Cardiovascular System Incorrect! Reptiles have a renal portal system where venous return from the tail and hindlimbs may be filtered through the liver. WikiVet Article: Lizard Cardiovascular System Correct! Reptiles have a renal portal system where venous return from the tail and hindlimbs may be filtered through the kidneys to bathe the renal tubules. Venous return may also be filtered through the liver. Therefore the injection of drugs that are cleared via tubular excretion into the caudal half of the body could result in lower than anticipated serum concentration because of their excretion in the urine before entering the systemic circulation.WikiVet Article: Lizard Cardiovascular System

3

What anatomical characteristic is specific to lizards capable of autotomy? They have a horizontal fracture plane through the body. They lack part of the neural arch of the tail vertebrae. They have a vertical fracture plane through the body. They have a single occiptal condyle. They have ribs on tail and cervical vertebrae. Please select an option Incorrect! Lizards that are capable of autotomy have a vertical fracture plane through the body and part of the neural arch of the tail vertebrae. WikiVet Article: Lizard Musculoskeletal System. Incorrect! Lizards that are capable of autotomy have a vertical fracture plane through the body and part of the neural arch of the tail vertebrae. WikiVet Article: Lizard Musculoskeletal System. Correct! Lizards that are capable of autotomy have a vertical fracture plane through the body and part of the neural arch of the tail vertebrae. WikiVet Article: Lizard Musculoskeletal System. Incorrect! Like other reptiles, lizards have a single occiptal condyle. This characteristic isn't specific to lizards capabale of autotomy. WikiVet Article: Lizard Musculoskeletal System. Incorrect! Ribs are present on all vertebrae except tail and cervical vertebrae. WikiVet Article: Lizard Musculoskeletal System.

4

In lizards, what is the proctodeum? The part of the cloaca which collects urinary wastage. The final chamber of the cloaca, prior to elimination. The part of the cloaca which collects faeces. The equivalent of a caecum in mammals. The name given to the transverse cloacal slit. Please select an option Incorrect! The ureodeum is the part of the cloaca which collects urinary wastage. WikiVet Article: Lizard Gastrointestinal System Correct! The proctodeum is the final chamber of the cloaca, prior to elimination. WikiVet Article: Lizard Gastrointestinal System Incorrect! The coprodeum is the part of cloaca which collects faeces. WikiVet Article: Lizard Gastrointestinal System Incorrect! A caecum is present in many lizard species. WikiVet Article: Lizard Gastrointestinal System Incorrect! The proctodeum is the final chamber of the cloaca, prior to elimination. WikiVet Article: Lizard Gastrointestinal System

5

Which sexing technique is most useful (and accurate) for species that are difficult to sex, such as tegus, beaded lizards and gila monsters? Sexing probes Temporary eversion of hemipenes under anaesthesia Radiography Hydrostatic eversion of hemipenes Endoscopy Please select an option Incorrect! Sexing probes (cloacal probing) can also be used in iguanas and monitors but aren't as consistently accurate as they are in snakes. WikiVet Article: Sexing Incorrect! Incorrect! Only in some lizard species, such as iguanas, will the hemipenes in mature males calcify and appear visible on radiographs. WikiVet Article: Sexing Correct! Incorrect!