Frog Dissection Pre Lab External Ventral External Dorsal

Frog Dissection Pre Lab

External (Ventral):

External (Dorsal):

External Features

Nictitating Membrane • Appearance: Clear or whitish/beige thin membrane. • Function: Protects the eye while swimming and attacking prey. • Location: Attached to bottom of the eye.

Tympanic Membranes • Appearance: Thin membrane circles on outside of head • Function: Transfer sound waves from ear drum to ear canal for hearing. • Location: Sides of head by eyes.

Internal Ears / Eustachian Tubes • Appearance: Small, slender tubes • Function: Transfers sound waves from the tympanic membrane to nasal cavity; equalizes air pressure while swimming • Location: Openings visible from inside of upper mouth

Vomerine Teeth • Appearance: Small swollen bumps (slimy) • Function: Help hold prey in mouth. • Location: Roof of mouth by nose.

Maxillary Teeth • Appearance: Sharper bumps • Function: Crush/hold prey • Location: Roof of mouth, outer rim.

Mouth (Teeth):

Nostrils:

Tongue • Appearance: Large light colored fleshy appendage • Function: Used to catch prey: Propelled from the mouth with powerful muscles; prey sticks to tongue upon contact. • Location: Attached to the FRONT of the mouth.

Frog Predation Tactics • https: //www. youtube. com/watch? v=w. Xq. K 5 Qulb. J 8

Heart • Appearance: Hard, red-brown mass. • Function: Circulate blood. • Location: Center of chest in between lungs, above liver.

Heart:

Lungs • Appearance: Brown flaps • Function: Bring in oxygen gas, and release carbon dioxide gas. • Location: Sides of heart within chest.

Stomach • Appearance: Large flesh-colored sack (tubular). • Function: Metabolize/digest food. • Location: Left side of frog (your right side), under liver.

Intestines • Appearance: Flesh-colored tube • Function: Absorb food nutrients + excrete waste • Location: Abdomen, connected to stomach.

Liver • Appearance: Gray-ish colored lobes (large) • Function: Metabolize toxins and fats. • Location: Center of chest, under heart and lungs.

Fat Bodies • Appearance: Yellow-ish squiggly noodles • Function: Additional energy storage + body heat. • Location: Sides of body (internal).

Cloaca • Appearance: Hole • Function: Multipurpose Hole Sperm/Eggs, Urine and Fecal Matter all come out of here. • Location: In between legs.

Male Parts (Do NOT have to identify) • Sperm • Testes • Cloaca

Female Parts (Do NOT have to identify) • Eggs • Ovaries • Cloaca

---Dissection Notes--1. Identify external structures. 2. Carefully open mouth and identify types of teeth + tongue. 3. Lay frog on back. 4. Carefully cut into chest and abdomen: - Make a vertical incision from throat down to crotch. - Make 2 horizontal incisions (one below throat, and one above crotch). 5. Open + Identify organs.

Cut through the Skin:

Cut through the Muscle:

Frog Dissection Demo • https: //www. youtube. com/watch? v=u. Lq. S 5 AVRio • https: //www. youtube. com/watch? v=b. OJyh k 4 QZvc