Shark Muscular Anatomy Definitions & Functions PDF

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Summary

Summary for vertebrate zoology lab practical. Professor is Dr. Stephenson. Includes the definitions and functions of the shark trunk muscles, branchial muscles, and hypobranchial muscles. Muscles in blue font were important for the lab practical. ...

Description

Shark Muscular Anatomy Trunk Muscles ●

Myotomes (=myomeres) & myosepta

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Horizontal skeletogenous septum

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Epaxial muscles

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Hypaxial muscles

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Linea alba

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Pectoral extensor: elevates pector fin

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Pectoral flexor: adducts pector fin

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Siphon (in males): muscular sac that secretes fluid that acts as lubricant

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clasper (in males): cupulatory (reproductive) organ

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Pelvic extensor: elevates pelvic fin

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Pelvic flexor: adducts pelvic fin8

Branchial Muscles ●

Quadratomandibularis (1st constrictor): close the mouth

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Preorbitalis (1st constrictor): Close the mouth

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Intermandibularis (1st constrictor): raises floor of mouth & pushes water out of gill slits

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Epihydoideus (from 2nd constrictor): Compress the gill pouches

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Interhydoideus (from 2nd constrictor): compress the gill pouches

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Levator maxillae superioris: raises the upper jaw

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Dorsal superficial constrictors (3rd - 6th): compress pharyngeal chamber, eject water, & close the gill slits

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Ventral superficial constrictors (3rd - 6th): compress pharyngeal chamber, eject water, & close the gill slits

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Cucillaris: elevates the gill arches & pectoral girdle

Hypobranchial Muscles: form single complex that open mouth, swallow, & expand gill pouches ●

Coracoacual

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Coracomandibular

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Caracohyoid...