| sinus node |
the heart
출처: www.gehealthcare.com/usen/whc/heartdiseaseterms.ht...
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| sinus |
Indentation between lobes on a leaf.
출처: www.aandmtreeservice.com/treeterm.htm
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| sinus |
Sinuses are air-filled cavities in the dense portions of the skull bone. The sinuses are formed in four pairs. The frontal sinuses are positioned behind the forehead, while the maxillary sinuses are behind the cheeks. Find a Sinus and Allergy Doctor in your area.
출처: premierdoctors.com/medical_dictionary.html
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