quadrant

quadrant (kwah´drant)

One quarter of a circle. In anatomy, roughly circular areas are divided for descriptive purposes into q.'s. The abdomen is divided into right upper and lower, and left upper and lower q.'s by a horizontal and a vertical line intersecting at the umbilicus. Q.'s of the ocular fundus (superior and inferior nasal, superior and inferior temporal) are demarcated by a horizontal and a vertical line intersecting at the optic disk. The tympanic membrane is divided into anterosuperior, anteroinferior, posterosuperior, and posteroinferior q.'s by a line drawn across the diameter of the drum in the axis of the handle of the malleus and another intersecting the first at right angles at the umbo. [L. quadrans, a quarter]

 

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