Anatomy & Physiology
1st Edition
ISBN:9781938168130
Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Chapter16: The Neurological Exam
Section: Chapter Questions
Problem 5ILQ: Watch this short video (http://openstaxcollege.org/l/facialnerve) to see an examination of the...
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Q27: Please type the answer this question
Depending on what environment a larval salamander lives in, it may have different structural features in the body.
Question: Based on the following diagrams, why might these differences be adaptive in the pond or stream?
Transcribed Image Text:gill fimbriae
dorsal fin
gill rachis
© 2001
jogrant
gular flap
costal grooves
(A) Pond form
antlerlike gills
tail fin
jbgrant© 2001
(B) Stream form
Figure 27. Body morphology of a salamander larva: (A) pond fom; (B) stream form.
Costal (costal refers to ribs) and nasolabial grooves
Look at a member of Ambystomatidae.
Identify the costal grooves. Costal grooves function to bring water up from the soil/ground to the rest of the body via
capillary action.
Look at a plethodontid salamander (member of Plethodontidae). Find the nasolabial grooves (if you can!). (All
plethodontid salamanders have this structure). The nasolabial groove is used to assist with olfactory senses. When a
plethodontid salamander touches its nose to the ground, particles move up the groove to the nares and towards the
vomeronasal organ. They also have small downward extensions of a fleshy upper lip off of the groove. See if you can see
them! Males may use them for picking up pheromones from females in the breeding season.
Transcribed Image Text:U PPER EYELID
COSTAL OROOVE
EYE.
SACRAL AREA
NOSTRIL
MOUTH.
ADULT
TAO
Figure Diagram of the nasal organ of the red-
backed salamander (Plethodon cinerens). The dashed lines
shows where the skin and skull were romoved to reveal the
SA LAMANDER
2
nasal organ. Abbreviations: en, external nares; Id, lateral di-
verticulum containing the vomeronasal organ; moc, main
olfactory chamber; nld, nasolacrimal duct; nlg, nasolabial
groove; vno, vomeronasal organ. Ilorizontal bar, 1 mm.
(Soure: Dawley tnd Bass 1989.)
Expert Solution
Step 1
Salamanders are known as Caudata, a term alluding to their tails. The greater majority of this species are appropriated in the Western Hemisphere. Lungless species (Plethodontidae) are totally limited to North America and the Neotropics.
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