Review Note
Last Update: 09/27/2023 04:36 AM
Current Deck: Comp Anat Exam 2::Comp Anat Exam 2 Lecture 7
New Card (Unpublished)Currently Published Content
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Commit #19070
Talk about the types of jaw suspension
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Commit #19070
Paleostyly- no jaws (ancient, agnathans have this)
Euautostylic- "true autostyly" has direct articulation with the braincase (palatoquadrate directly articulates -not fused, uses connective tissues- to braincase). Have hyoid arch but it does not directly participate in the jaw suspension. This is seen in placoderms
Amphistylic- hyomandibula supports jaws, jaws still connected to skull with connective tissue, seen is crossopterygii, "primitive" chondrichthyes and osteichthyes
Hyostylic- no major connection to braincase, hyomandibula is playing a major role in suspending the jaws form the chondrocranium/neurocranium. This is seen in bony fishes and elasmobranchs and can become modified and VERY MOBILE
Secondary autostylic- also called metautostylic. Upper jaw fuses with braincase (and bones in jaw become the inner ear bones). This is seen in amphibians, vertebrates, birds, mammals, etc.
Incus-Quadrate, Malleus-Articular, Hyomandibular-Stapes
Euautostylic- "true autostyly" has direct articulation with the braincase (palatoquadrate directly articulates -not fused, uses connective tissues- to braincase). Have hyoid arch but it does not directly participate in the jaw suspension. This is seen in placoderms
Amphistylic- hyomandibula supports jaws, jaws still connected to skull with connective tissue, seen is crossopterygii, "primitive" chondrichthyes and osteichthyes
Hyostylic- no major connection to braincase, hyomandibula is playing a major role in suspending the jaws form the chondrocranium/neurocranium. This is seen in bony fishes and elasmobranchs and can become modified and VERY MOBILE
Secondary autostylic- also called metautostylic. Upper jaw fuses with braincase (and bones in jaw become the inner ear bones). This is seen in amphibians, vertebrates, birds, mammals, etc.
Incus-Quadrate, Malleus-Articular, Hyomandibular-Stapes