1. A thin partition separating adjacent regions. 2. SYN: diaphragm (1). [G. d., a partition wall, midriff]
- d. sellae [TA] a fold of dura mater extending transversely across the sella turcica and roofing over the hypophyseal fossa; it is perforated in its center for the passage of the infundibulum. SYN: sellar diaphragm, diaphragm of sella turcica, diaphragm sellae, tentorium of hypophysis.
- d. urogenitale SYN: urogenital diaphragm.
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di·a·phrag·ma (di″ə-fragґmə) pl. diaphragґmata [Gr. “a partition-wall, barrierâ€] 1. [TA] diaphragm: the musculomembranous partition separating the abdominal and thoracic cavities, and serving as a major thoracic muscle. Called also diaphragmatic muscle and thoracic or respiratory diaphragm. 2. a separating structure.Medical dictionary. 2011.