Squid Internal Anatomy

Cephalopoda

Gills

paired, feathery organs used for respiration

Stomach

small sac where food is stored and digested

digestion is entirely extracellular

Pancreas

small and granular digestive gland

secretes enzymes into stomach for food breakdown

Liver

long gland that releases secretions into stomach for enzymatic digestion

Anus

terminal portion of digestive tract

near siphon

Cecum

large digestive chamber prominent along dorsal end of body

Ink Sac

sac that opens into rectum and secretes brown/black fluid when when animal is alarmed

Vas Deferans (M)

open-ended chamber that receives and stores sperm

Spermatophoric Gland (M)

coiled tubules that package sperm cells into spermatophore packets

Ovary (F)

site of egg production

Oviduct (F)

open-ended chamber that receives eggs from ovary

Nidamental Glands (F)

produce secretions that form an encasement around strings of eggs for protection

Retractor Muscles

long muscles that control retraction of siphon and head

Kidneys

paired near systemic heart

filter N waste

Systemic Heart

larger

muscular ventricle that receives oxygenated blood from gills and pumps it throughout body

Branchial Hearts

smaller

muscular chambers that receive deoxygenated blood from body and pump it to gills