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Zygomasseteric system
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The zygomasseteric system refers to the anatomical arrangement of the masseter muscle and the zygomatic arch in the skulls of rodents. This system plays a crucial role in the diverse chewing mechanics
Skull of Aplodontia rufa
Skull of Aplodontia rufa
Skull of an oriental giant squirrel. Note the classic sciuromorphous shape of the anterior zygomatic region.
Skull of an oriental giant squirrel. Note the classic sciuromorphous shape of the anterior zygomatic region.
Skull of a nutria demonstrating the hystricognathous lower jaw and hystricomorphous zygomasseteric system.
Skull of a nutria demonstrating the hystricognathous lower jaw and hystricomorphous zygomasseteric system.
Gerbil skull displaying the myomorphous condition
Gerbil skull displaying the myomorphous condition
Hystricomorpha
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Hystricomorpha is a term referring to families and orders of rodents which has had many definitions throughout its history. In the broadest sense, it refers to any rodent with a hystricomorphous zygom
Zygomasseteric system
…masseter from 30 to 60 degrees, greatly strengthening the forward component of the masseter contraction. This condition is found throughout the suborders Hystricomorpha and Anomaluromorpha. In the suborder Myomorpha, it is found in the superfamily Dipodoidea and some fossil Muroidea (such as Pappocricetodon). Hystricomorphy…
Hydrochaeris hydrochaeris
Hydrochaeris hydrochaeris
Henry Vilas Zoo IMG 2385
Henry Vilas Zoo IMG 2385
Cranium of a capybara showing the enlarged infraorbital canal present in most members of the Hystricomorpha: This condition is termed hystricomorphy.
Cranium of a capybara showing the enlarged infraorbital canal present in most members of the Hystricomorpha: This condition is termed hystricomorphy.
Cranium of a crested porcupine showing the enlarged infraorbital canal present in most members of the Hystricomorpha: This condition is termed hystric
Cranium of a crested porcupine showing the enlarged infraorbital canal present in most members of the Hystricomorpha: This condition is termed hystricomorphy.