Presentation on theme: "Notes: 9.14, 9.15 Peripheral Nervous System - consists of the nerves that branch out from the CNS and connect it to other body parts, also includes."— Presentation transcript:
1Notes: 9.14, 9.15Peripheral Nervous System - consists of the nerves that branch out from the CNS and connect it to other body parts, also includes the cranial nervesSomatic Nervous System (conscious activities) Skin, skeletal system Autonomic Nervous System (unconscious activities); heart, viscera, glands
2Peripheral Nervous System The spinal nerves comes out of the spine, and the cranial nerves come out of the brain directly.There are 12 pairs of cranial nervesThey are numbered with Roman numerals.
4I. OLFACTORYTransmit the sense of smell. Outside of the CNS they are called olfactory nerves, and inside of the CNS they are called the olfactory tract.
5II. OPTIC NERVETransmits information from the eye’s retina.
6III Occulomotor NerveThis controls most of the extrinsic muscles of the eye (that move the eyeball).
7IV. Trochlear NerveInnervates an extrinsic eye muscle
8V. Trigeminal NerveThis is the main sensory nerve of the face. It has a large branch that passes through the foramen ovale of the skull. It has three parts.
9VI: AbducensControls one of the eye muscles (lateral rectus).
10VII Facial Nerve This innervates the muscles of facial expression. A person who cannot blink or smile may have damage to this nerve.BELL’S PALSY is damage of the facial nerve causing paralysis on one side.
11VIII. VESTIBULOCOCHLEAR Transmits hearing and balance. (also called Auditory nerve)
12IX: GLOSSOPHARYNGEALcarries information from the head and neck to the brainstem.Information about blood pressure (baroreceptors)
13X Vagus Nerve(vagrant = “wanders”) - the only cranial nerve that travels into the abdomen.This is the most important cranial nerve because it innervates all of the organs in the thoracic and abdominal cavities
14XI: ACCESSORY NERVEEnters the skull through foramen magnum and leaves through the jugular foramen.It just supplies the shoulder muscles.
15XII. HYPOGLOSSAL NERVE Supplies the tongue. Damage causes impairment of speech.
16I. Olfactorysense of smellII. OpticsightIII. Occulomotormove eyesIV. Trochlearmove eyelidsV. Trigeminalface, jaw, chewingVI. AbducenseyesVII. Facialfacial expressionsVIII. Vestibulocochlear (Auditory)sense of equilibrium, hearing
18Need to know all of the cranial nerves ? On Old Olympus Towering Top A Fin And German Viewed A Hop
19Do Now 1/30/13What type of numbering is used to identify cranial nerves?Which cranial nerve is considered the most important?If you sever this type of nerve, you will have a speech impediment. Which nerve is this?What is the mnemonic I taught that will help you identify all 12 cranial nerves? Can you make up a different one if you don’t like the current mnemonic?
35The sheep brain also has the 12 cranial nerves, but they can be difficult to find
36Do Now 2/6/13 What are the cranial nerves in the mnemonic, On Old Olympus Towering Top, A Fin And German Viewed A Hop?How many pairs of spinal nerves are there?What does Cauda Equina mean? Where do you find it?