Results 171 to 180 of about 47,390 (286)

Assessing the microstructure of simple rhamphothecae in chickens (Aves: Galliformes: Gallus gallus domesticus)

open access: yesJournal of Anatomy, EarlyView.
Simple rhamphotheca are externally homogeneous but internally are composed of several corneous layers with varying hardness. Areas under more mechanical stress such as the rostral portion and the tomia are significantly harder than other areas. Abstract Corneous sheaths on the jaws of beaked tetrapods, or rhamphothecae, are classified as simple or ...
Khanh H. T. To   +2 more
wiley   +1 more source

A bristle‐nosed Jurassic ray‐finned fish (Actinopterygii) bears true dermal odontodes on its snout

open access: yesJournal of Anatomy, EarlyView.
Teeth show extreme diversity, including tooth‐like dermal odontodes or “skin teeth” in many extant fishes. We describe the anatomy of enlarged tubercles on the snout of Redfieldius, an extinct early Jurassic fish. We found that the tubercles in Redfieldius are dermal odontodes that evolved independently from those of living species. Abstract Comparison
Jack Stack   +2 more
wiley   +1 more source

The variability of giraffe skull morphology

open access: yesJournal of Anatomy, EarlyView.
What does giraffe skull shape tell us about their development and evolution? Abstract Giraffe (Giraffa spp.) are among the most unique and charismatic extant animals, largely due to their distinct morphology. The evolutionary and developmental origin of ossicones is a key factor in giraffid biology, yet other features building their characteristic head
Nikolaos Kargopoulos   +15 more
wiley   +1 more source

Parietal Intradiploic Encephalocele : Case Report

open access: yes
application/pdfA 66-year-old man presented with a parietal intradiploic encephalocele manifesting as dizziness in June 2001. Skull radiography showed lytic change involving the right parietal bone.
Endo, Shunro   +5 more
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