All About Lobsters. The New England lobster is a fairly terrifying-looking sea-green creature that's cannibalistic, reclusive, rather nasty, and very good to eat. The New England lobster (Homarus Americanus) is a crustacean related to crabs, shrimp, crayfish and barnacles. An arthropod, it is more closely related to insects than to animals (hence the jocular term bugs for lobsters).
Primary Lateral Sclerosis (PLS) PLS is the term for a group of upper motor neuron disorders that cause cause progressive spasticity (stiffness) and weakness in the legs, arms, and speech and swallowing muscles. See PLS. Also considered a benign variant of ALS.
What is PLS? Primary Lateral Sclerosis (PLS) is a group of rare, degenerative, neurological disorders. They are sporadic, meaning there is no clear familial link, although there are hereditary forms of PLS. PLS is caused primarily by degeneration of the upper motor neurons in the brain and spinal cord, which results in increasing spasticity and weakness of voluntary muscles.