BIOL 202 Practical 2: Disections

Clitellum

Earthworm: reproductive structure

Gizzard

Earthworm: Uses soil to grind up food (below crop)

Crop

Earthworm: where food is stored before the gizzard (above gizzard)

Cerebral Ganglia

Earthworm: brain

Dorsal Blood Vessel

Earthworm: runs down length of worm below the gizzard

Arms

Squid: used to grab and hold prey

Tentacles

Squid: Used to capture prey

Fin

Squid: provide stability and maneuverability

Mantle

Squid: main part where organs are housed, fin and head is attached to it

Ink sac

Squid: just below siphon, holds ink

Pen

Squid: plastic-like support structure

Gills

Squid: for respiration

Siphon

Squid: jet propulsion for locomotion

Cephalothorax

Crayfish: Head and middle of body

Carapace

Crayfish: middle of body where head and abdomen are attached

Antenna

Crayfish: used for sensing objects

Green glands

Crayfish: excretory organs

Swimmerets

Crayfish: Under abdomen near tail

Madreporite (mother pore)

Starfish: opening to WVS on aboral side

Tube feet

Starfish: used for locomotion

Water vascular system (WVS)

Starfish: network of hydraulic canals for locomotion/respiration/feeding

Ring canal

Starfish: central hub on wvs and surrounding mouth

Digestion glands

Starfish: runs down arms, used for digestion

Gonad glands

Starfish: runs next to the digestive glands, used for reproduction

Radial canal

Starfish: branches off ring canal and runs down arm and acts as a pathway for distributing water

Liver

Rat: big and grey, right in the middle

Kidney

Rat: on back + bottom, filters blood and eliminates waste

Mammary gland

Rat: milk producing gland

Heart

Rat: top of intestines near throat, pumps blood i’m assuming