L16: Mammalia Flashcards
Describe anatomy of mammalian skin and associated structures Describe differences between the mammalian and reptilian skeletons Explain the mammalian dental formula Name and list some features of the three principal lineages of mammals
Identify the features of mammalian skin and its derivaties
Hair
Oil Glands
Sweat Glands
Mammory glands
Claws
Scales
T/F, there is no blood flow in the epidermis, and that is why skin cells die when they reach the surface
True
Describe the mammalian skeleton
Vertebral column divided in 5 regions: cervical, thoracic, lumner, sacral, caudal
Spine dorsoventrally and laterally flexible
Appendages directly below body
Describe the mammalian skull
Three middle ear ossicles
Two occipital condyles
Secondary palate (like reptiles)
Complete separation between respiratory and digestive tract
Describe the differences between mammalian and reptile jaws
Reptiles: jaw articulation from articular and quadrate bones
Mammals: Articulation from dentary and sqamosal bones
What kind of teeth fo mammals have?
Heterodont (thecodont): incisors, canine, premolars, molars
The Incus and malleus evolved from what bones found in reptilian jaws?
Quadrate and articular, respectively
T/F: the mammalian dental formula is always 2-1-2-3
False! All mammals have a unique dental formula
What is diastema?
Common in herbivores
Gap in teeth
Corresponds to the length of snout
T/F: Mammalian red blood cells are non-nucleated
True
T/F: Mammals have complete separation of atrial and venous blood
True! There is somplete separation of the ventricles
T/F: Sensory development is consistent for an active nocturnal life style
True
Which sense is generally poorly developed in mammals (except primates)
Vision - poor colour vision
What are the three subclasses of Mammals?
Prototheria (monotremes)
Metatheria (marsupials)
Eutheria (true placentals)
What subclass of mammals lays hard shelled eggs?
Prototheria
