Crab in action on a sea urchin. Crabs are in the subphylum Crustacea. They are decapods (having ten legs), along with lobsters, crayfish and shrimps. Crabs form an order within the decapods, called the Brachyura. Their short body is covered by a thick exoskeleton.
Plummer's Disease is a condition where there is a single hyperfunctioning nodule producing excess thyroid hormone.Henry Plummer in 1913 described a clinically distinct form of thyrotoxicosis due to solitary or multiple toxic nodules in the thyroid.I restrict the term to a solitary a toxic nodule. This nodule is an adenoma (a benign tumour).enry Plummer in 1913 described a clinically distinct form of thyrotoxicosis due to solitary or multiple toxic nodules in the thyroid. I restrict the term to a solitary a toxic nodule. This nodule is an adenoma (a benign tumour).
Restless legs syndrome (RLS; also called Willis-Ekbom disease) and periodic limb movement disorder (PLMD) are common sleep disorders, especially in the elderly. RLS is a genetic disorder resulting in prickly or tingling sensations in the leg that cause patients to want to move their legs.It often results in insomnia.estless legs syndrome (RLS; also called Willis-Ekbom disease) and periodic limb movement disorder (PLMD) are common sleep disorders, especially in the elderly. RLS is a genetic disorder resulting in prickly or tingling sensations in the leg that cause patients to want to move their legs. It often results in insomnia.