rhomboidal sinus

rhom·boi·dal si·nus

, sinus rhomboidalis
a dilation of the central canal of the spinal cord in the lumbar region.
Synonym(s): rhombocele

rhomboidal sinus

[rom′boidəl]
an opening in the central canal of the lumbar spinal cord.

rhomboidal sinus

(1) Cavity of septum pellucidum; cavum septi pellucidi [NA6]. 
(2) Terminal ventricle of spinal cord; ventriculus terminalis medullae spinalis [NA6]

rhom·boi·dal si·nus

, sinus rhomboidalis (rom-boy'dăl sī'nŭs, rom'boy-dā'lis)
A dilation of the central canal of the spinal cord in the lumbar region.
Synonym(s): rhombocele.
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