| The venous sinuses are lined not by endothelium but by specialized reticular cells, which are fixed macrophages. |
| The frontal sinuses may be absent, small, or remarkably large, extending through orbital bones, zygomatic processes, and into the squamae. |
| However, current research shows that bits of hair are only present in around half the sinuses in this area of skin. |
| In contrast to lymph nodes, the thymus contains no lymph sinuses or afferent lymphatic vessels. |
| All this is jam-packed into your sinuses and other nasal structures, occluding your airway completely. |
| Eventually, we wound up radiographing it, and she had a large cyst in her sinuses on the left side. |
