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Virtual Earthworm Dissection. Images Courtesy of: http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/index.html. External Anatomy. The top of the earthworm is the dorsal side. This is the darker side of the worm.

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virtual earthworm dissection

Virtual Earthworm Dissection

Images Courtesy of: http://www.flushing.k12.mi.us/srhigh/tippettl/biology/lum/index.html

external anatomy
External Anatomy

The top of the earthworm is the dorsal side. This is the darker sideof the worm.

The bottom of the earthworm is the ventral side. This is the lighter sideof the worm.

The anterior region of the earthworm is the head region. There is a mouth at the head region.

The posterior region of the earthworm is the tail region. There is an anus at the tail region.

external anatomy clitellum
External Anatomy: Clitellum

Note the swelling of the earthworm near its anterior side. This is the clitellum.

Each segment of a worm has small pairs of bristles called setae which help it move.

digestive system mouth
Digestive System: Mouth

Mouth: tiny opening at anterior end through which food enters

digestive system pharynx
Digestive System: Pharynx

Pharynx: “throat”; smooth part following the mouth

digestive system esophagus
Digestive System: Esophagus

Esophagus: main food tube connecting pharynx to crop

digestive system crop
Digestive System: Crop

Crop: temporary holding tank controls food entering gizzard

digestive system intestine
Digestive System: Intestine

Intestine: absorbs nutrients (food) and water

virtual animation of worm digestion
Virtual Animation of Worm Digestion
  • http://yankeeworm.org/ym_about.html
  • The animation on worm digestion is courtesy of North Carolina State University. HERMAN THE WORM.
circulatory system aortic arches
Circulatory System: Aortic Arches

Aortic Arches (Hearts):

5 of them pump blood

circulatory system dorsal blood vessel
Circulatory System: Dorsal Blood Vessel

Dorsal Blood Vessel: main blood vessel through which blood travels

reproductive system seminal vesicles
Reproductive System: Seminal Vesicles

Seminal Vesicles: produce sperm (large white organs)

reproductive system seminal receptacles
Reproductive System: Seminal Receptacles

Seminal Receptacles: store sperm (smaller white organs)

nervous system ventral nerve cord
Nervous System: Ventral Nerve Cord

Ventral Nerve Cord: sense stimuli (small white cord under intestine)

cuticle
Cuticle

Cuticle: outer protective covering

septum
Septum

Septum: individual segment divisions that hold the skin onto the worm

labeling diagrams
Labeling Diagrams

Match the letter appearing in front of each word in the word bank with the number of the structure.

a. Mouth

b. Pharynx

c. Esophagus

d. Crop

e. Gizzard

f. Intestine

g. Aortic Arches (Hearts)

h. Dorsal Blood Vessel

i. Ventral Blood Vessel

j. Clitellum

k. Seminal Vesicles

l. Seminal Receptacles

m. Ventral Nerve Cord

n. Brain

7

3

2

4

6

5

1

8

9

14

12

11

10

13

labeling diagrams1
Labeling Diagrams

Match the letter appearing in front of each word in the word bank with the number of the structure.

a. Mouth

b. Pharynx

c. Esophagus

d. Crop

e. Gizzard

f. Intestine

g. Aortic Arches (Hearts)

h. Dorsal Blood Vessel

i. Ventral Blood Vessel

j. Clitellum

k. Seminal Vesicles

l. Seminal Receptacles

m. Ventral Nerve Cord

n. Brain

7 h

3 c

2 n

4 g

6 f

5 k

1 a

8 j

9 i

14 b

12 d

11 e

10 m

13l