Lab 2 (Shark and vertebrae) Flashcards
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placoid scales
have posterior orientation to reduce turbulence along the body surface, remnants of the ancestral bony armour
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rostrum
tip of nose - used to limit water resistence
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heterocercal caudal fin
produce thrust that results in forward movement
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ampullae of lorenzini
dorsal and ventral side of rostrum; act as electroreceptors
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gill slits
5 locaed laterally and anterior to pectoral fin; respiratory water exits through these when not feeding)
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precerebral cavity
on dorsal apsect of chondrochranium; holds jelly like material near rostrum
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foramen magnum
spinal chord passes through this
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occipital condyles
articulates with first trunk vertebra
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optic foramen
optic nerve passes through this
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palatoquadrate
thought to be derived from the paired epibranchial elements of arch
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meckel’s/mandibular cartilage
lower jaw - splanchnocranium
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hyoidmandibular cartilage
splanchnocranium, hyoid arch
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basihyal cartilage
splanchnocranium, hyoid arch
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neural arch
extends dorsally and cradles spinal cord
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neural spine
vertebral column, terminal of vertebral canal
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dorsal intercalary plates
triangular plates that complete a continuous roof over the spinal cord
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basapophysis
homologous to basal portions of hemal arches
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ribs
cartilginous, articulate with basapophysis
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ventral intercalary plates
very small triangular structures that occur between the basapophysis
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ceratotrichea
offers neural support for the fin that extends and stiffins into fin web
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basal pterygiophores
3 parts that articulate with scapular cartilages; support fins proximally
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radial pterygiophores
median fins - radiating from the basal cartilages; forms major support of the fin
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puboischiadic bar
makes up the pelvic girdle
iliac process
projects from anterior end of puboischiadic bar
