spinal cord: (not pictured) component of the nervous system made up of a soft fatty substance
heart: muscular organ helping blood to circulate.
gallbladder: small reservoir in which bile secreted by the liver collects before being discharged into the intestine during digestion.
liver: gland secreting bile that contributes to digestion.
pancreas: digestive gland connected to the intestine that produces secretions and hormones.
stomach: dilated section of the digestive tract before the intestine; it receives food to be digested.
small intestine: long thin portion of the digestive tract behind the stomach in which most of the digestion and food absorption take place.
large intestine: short wide portion of the digestive tract beforethe cloaca in which a small part of digestion and elimination of waste take place.
urinary bladder: (not pictured) reservoir where urine from the kidneys collects before being evacuated by the cloaca.
cloaca: (not pictured) orifice common to the intestine and the genital and urinary tracts; it is located at the end of the digestive tract.
spleen: (not pictured) organ of the circulatory system where impurities in the blood are destroyed.
kidney: (not pictured) organ secreting urine; it eliminates toxic substances from the body.
testis: (not pictured) male genital gland producing sperm.
lung: respiratory organ made of an extensible tissue; it forms a sac into which air inhaled through the nostrils is carried. A frog also breathes through its skin.
brain: (not pictured) main organ of the nervous system consisting of nerve centers; it is located in the upper portion of the head.
esophagus: (not pictured) canal of the anterior portion of the digestive tract; it carries food to the stomach.
tongue: (not pictured) movable mouthpart having gustatory and prehensile functions.
hind limb: long powerful articulated member attached to the terminal end of the trunk; it has five webbed toes used for walking, jumping and swimming.
webbed foot: each of the digits of the foot, connected by membranes; when spread, they make swimming easier.
web: fine membrane of skin connecting the digits of the foot; it stretches when the frog swims.
digit: terminal end of the limbs formed of various articulated bones; it has neither nails nor claws.
forelimb: short articulated member located behind the head; it has four digits and is used for walking.
lower eyelid: thin muscular membrane that is translucent and movable; it rises from the lower edge of the eye to protect and cleanse it.
mouth: anterior cavity of the digestive tract located on the ventral surface that allows food to be ingested.
nostril: external orifice of the nasal cavity located above the mouth and having olfactory and respiratory functions.
snout: anterior round protruding portion of the head that forms the mouth and the nostrils.
eyeball: protruding organ of sight contained in the bony cavity at the top of the head used to perceive light intensity, motion and shapes.
tympanum: thin strong elastic membrane connected to the inner ear to capture acoustic vibrations.
upper eyelid: thick fixed membrane.
trunk: bony portion of the body to which the head and limbs are attached.
ring canal : circular canal where filtered water enters through the madreporite and flows into the radiated canals.
rectal cecum: waste is stored here before it goes through the anus.
stomach : receives food to be digested.
gonad : produces gametes (spermatozoids or ovules) depending on the sex of the starfish
pyloric cecum : radiated duct of the digestive tract produces digestive enzymes and allowed digested food to be stored.
gonopore :where gametes are expelled into the water to be fertilized.
intestine : where absorption of nutrients is carried out and waste is transformed into fecal matter.
radial canal : receives water from the annular canal, which then passed into the tube feet.
ampulla : contracts to let water enter the tube foot, allowing it to extend; when it dilates, the foot retracts.
esophagus : allows food to reach the stomach.
Arms or rays - project from disc
Central disc - the center of the starfish
Oral surface - where the mouth is
Aboral surface - the top of the starfish
Madreporite - small white circular area, off-center on aboral surface of disc
anus - small centered aborally on disc, allows waste to be ejected
Spines - many short, rough, limy, in patterns over aboral surface
Eyespot - small, pigmented on one end of each arm
Ambulacral grooves - one along oral surface of each ray
Oral Spines - surround the mouth
Tube feet - soft, slender, with expanded tips; 2 or 4 rows in each groove
Mouth - on oral surface in center, allows food to be digested
Link for dissection video: http://youtu.be/uh6MdVdMxe0