GLOSSARY 565 



Ex- (ex), prefix meaning "out". 



Exopodite (ex-6p'-o-dit), the outer branch of a biramous appendage. 

 Extensor (ex-ten'-ser), a muscle that straightens out a joint. 

 Extracellular (ex-tra-ceT-Q-lar), outside of the cell. 



Fascia (fash'-i-a), a sheet of connective tissue used in binding together and 



supporting internal body parts such as muscles. 

 Fauna (fo'-na), the animal life of any region. 

 Femoral (fem'-o-ral), refers to the leg. 



Femur (fe'-mur), the thigh bone; also a segment of insect legs. 

 Fibula (flb'-u-la), the smaller of the bones of the lower leg. 

 Fission (fish'-un), the division of an organism into parts of approximately 



equal size. 

 Flagellum (fla-jel'-um), a hair-like projection from certain cells. 

 Flexor (fiex'-er), a muscle that bends a joint. 

 Foramen (f5r-a'-men), an opening in the skull, such as the "foramen magnum" 



through which the spinal cord passes. 



Gamete (gam'-et), a sexual reproductive cell which must unite with a gamete 



of the opposite sex to produce a zygote. 

 Gametocyte (gam-et'-o-slt), a cell that is to produce a gamete or gametes; 



found in the Sporozoa. 

 Gastrocoel (gas'-tro-sel), the cavity within the archenteron. 

 Gastrula (gas'-tru-la), the two-layered stage of the early embryo consisting 



of ectoderm and endoderm. 

 Ganglion (gang'-li-6n), an enlarged mass of nerve tissue; a nerve center. 

 Gastrovascular (gas-tro-vas'-cu-lar), a cavity in the body of Coelenterates that 



serves somewhat for digestion and circulation. 

 Gene (jen), an ultramicroscopic unit of heredity. 

 Genetics (je-net'-Iks), a phase of biology dealing with heredity. 

 Genital (jen'-i-tal), pertaining to the reproductive system. 

 Genus (je'-nus), pi. genera (jen'-er-a), a subdivision of biological families; the 



first word of the scientific name of a plant or animal. 

 Gizzard (giz'-ard), a part of the digestive tract of certain animals, such as 



earthworms and birds, where the food is ground by muscular action. 

 Glochidium (glo-kid'-i-um), the larva of fresh-water clams. 

 Glottis (glot'-is), the opening into the larynx. 

 Goiter (goi'-ter), an abnormality of the thyroid gland, sometimes causing a 



swelling on the neck. 

 Gonad (go'-nad), a reproductive gland that produces gametes. 

 Gracilis (gra'-sil-is), a muscle on the inner surface of the thigh. 



Hemoglobin (hem-5-glob'-in), red, oxygen-absorbing matter found in the blood 



of many animals. 

 Hepatic (he-pat'-ik), pertaining to the liver. 

 Hermaphroditic (hur-maf'-ro-dit-Ic), bearing both male and female sex organs 



in one body. 

 Herpetology (hur-pe-t6l'-o-ji), a study of amphibians and reptiles. 

 Heterozygous (het-er-d-zlg'-us), bearing unlike genes. 

 Histology (his-tol'-o-ji), a phase of biology dealing with microscopic structure, 



a subdivision of morphology. 



