Prefrontal bone

Prefrontal bone

The prefrontal bone is a bone separating the lacrimal and frontal bones in many tetrapod skulls. It first evolved in the sarcopterygian clade Rhipidistia, which includes lungfish and the Tetrapodomorpha.cite_book |last=Cloutier |first=Richard |coauthors=& Ahlberg, Per E. |year=1996 |chapter=Morphology, characters, and the interrelationships of basal sarcopterygians |editor=Stiassny, Melanie L.J.; Parenti, Lynn R.; & Johnson, G. David (eds.) |title=Interrelationships of Fishes |location=San Diego |publisher=Academic Press |pages=445-479 |isbn=978-0126709513] The prefrontal is found in most modern and extinct lungfish, amphibians and reptiles. It is very small, fused to the frontals or lost in many groups of coelurosaurian theropod dinosaurs and is completely absent in their modern descendants, the birds. The prefrontal was also lost in early mammaliaforms and so is not present in modern mammals either.cite_web |url=http://www.palaeos.com/Vertebrates/Units/Unit420/420.100.html#Mammaliformes |title=Mammaliformes |publisher=Palaeos: The Trace of Life on Earth |accessdate=2008-01-25]

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  • prefrontal bone — pars nasalis ossis frontalis …   Medical dictionary

  • Prefrontal cortex — Prefrontal redirects here. For the skull bone, see Prefrontal bone. For the reptile scales, see Prefrontal scale. Brain: Prefrontal cortex Brodmann areas of lateral surface. Per BrainInfo, parts of #8, #9, #10, #1 …   Wikipedia

  • Prefrontal — Pre*fron tal, a. (Anat. & Zo[ o]l.) Situated in front of the frontal bone, or the frontal region of the skull; ectethmoid, as a certain bone in the nasal capsule of many animals, and certain scales of reptiles and fishes. n. A prefrontal bone or… …   The Collaborative International Dictionary of English

  • prefrontal — I. adjective Date: 1854 anterior to or involving the anterior part of a frontal structure < a prefrontal bone > II. noun Date: 1854 a prefrontal part (as a bone) …   New Collegiate Dictionary

  • prefrontal — 1. Denoting the anterior portion of the frontal lobe of the cerebrum. 2. Denoting the granular frontal cortex rostral to the premotor area. * * * pre·fron·tal .prē frənt əl …   Medical dictionary

  • prefrontal — /ˌpriˈfrʌntl/ (say .pree fruntl) adjective 1. in front of the frontal bone or gyrus. –noun 2. the middle portion of the ethmoid bone …  

  • prefrontal — a superficial, paired, dermal bone lying in front of the eye between the lacrymal and first supraorbital and covering and fusing with the parethmoid; a term often used for the lateral ethmoid or a portion of the lateral ethmoid of dermal origin …   Dictionary of ichthyology

  • prefrontal — adjective a) Of, pertaining to or situated in the anterior part of the frontal lobe b) Of, pertaining to or situated in front of the frontal bone Ant: postfrontal …   Wiktionary

  • prefrontal — prɪːfrÊŒntl adj. located at the front of the frontal bone or lobe (Anatomy) …   English contemporary dictionary

  • prefrontal — adjective 1》 Anatomy in or relating to the foremost part of the frontal lobe of the brain. 2》 Zoology relating to or denoting a bone in front of the eye socket in some lower vertebrates …   English new terms dictionary

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