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(invertebrate zoology)
A forked process as the last abdominal segment of certain crustaceans, and as part of the spring in collembolans.



special organs in some insects and crustaceans.

(1) A part of the internal chitinous skeleton of an insect thorax, also known as apophysis. The furca projects into the body in the form of a furcate outgrowth (on the ventral side of the thoracic segments), to which muscle tendons are attached.

(2) A springing organ of insects of the order Collembola, also known as furcula. The furca consists of a pair of out-growths grown together at their base on the ventral side of the fourth abdominal segment. When at rest these outgrowths are folded under the abdomen and secured to a special outgrowth on the third abdominal segment. The furca can unfold downward and backward with force, and when it strikes the ground, it can propel the insect into the air.

(3) A pair of appendages at the end of the last abdominal segment in some crustaceans, such as copepods.

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3 The prognosis maybe questionable, if treatment involves furcal region.
After stealing just six bases in the first five months of the year, Furcal - who once stole 46 bases with the Atlanta Braves - swiped six in September and the first week of October.
I can't give her the harder stuff I'm reading," Furcal says, switching between English and Spanish.
But Furcal came through, and Ethier's swagger is back.
What distinguishes Furcal and the game's current class of quick players is that they are running at a time when baseball has stopped to wait for the long ball.
Judging by the aforementioned double play turned on a practice field one morning, Furcal and Hudson come by those instincts naturally.
Furcal has a specifically prescribed core-strengthening program designed to keep his back healthy, and his new three-year, $30 million contract includes a provision that will pay him an additional $1 million each year if he adheres to that program.
The other was Monday, when Furcal finally did go to Triple-A Las Vegas, played four innings at shortstop and went 1 for 3 at the plate.
Club officials were hoping to activate Furcal when the team begins its final homestand of the first half on Monday night against Atlanta.
Furcal seemed on the verge of beginning rehab on at least one previous occasion during that stretch, only to be told by a back specialist that he needed two more weeks of rest.
Furcal did some running Friday and said his pace was only about 60 percent of full speed.