Squid Dissection

Siphon/Funnel Squid draws water into mantle cavity through the collar Water is forced back out the siphon The squid moves by water-jet propulsion

Siphon/Funnel

Siphon Retractor Muscles Used to change the orientation of the siphon, resulting in a change in direction of the jet of water exiting the siphon Aids in swimming direction

Siphon Retractor Muscles

Anterior Vena Cava Vein Brings un-oxygenated blood back from the head to the branchial hearts

Anterior Vena Cava (Vein)

Ink Sac Silvery structure attached to the rectum Filled with a pigment that can be ejected into the water when the squid is disturbed

Ink Sac Anus

Anus Release waste & ink Connected to the ink sac is the rectum, with the anus at the end Release waste & ink

Ink Sac Anus

Gills 2 Respiratory organs Oxygenates blood, removes carbon dioxide

Gill

Branchial Hearts Pumps oxygen-poor blood to gills

Branchial Heart

Systemic Heart Found under branchial hearts, between 2 gills Pumps oxygen-rich blood back to the body/head

Systemic Heart

Caecum Can expand greatly to hold food/nutrients Absorbs nutrients for the body

Caecum

Under-Side Cecum

Pen Functions as the skeleton Provides support for the mantle Provides a place for organ attachment

Pen

Pen: Pulled out

The End