By Richard Nordquist. Like adjectives and adverbs, prepositional phrases add meaning to the nouns and verbs in our sentences. There are two prepositional phrases in the following sentence: The first prepositional phrase-- in the kitchen -- modifies the noun air; the second-- of stale food --modifies the verb reeked.
Reality: An epidural involves injecting pain-blocking medication into a space between the vertebrae and the spinal fluid; it usually takes about 15 minutes to work and lasts as long as needed. A spinal is an injection directly into the spinal fluid; it is given as part of the CSE technique and takes effect in five minutes.
Serosa are made up of two layers of tissue with a thin layer of serous fluid in the middle. One layer is made up of mesothelium, which produces the fluid, while the other is made up of connective tissue, which attaches the membrane to other parts of the body and provides blood and nerves for the epithelial layer.