Course Hero Logo

nervous system .docx - Nervous System: Anatomy: The purpose...

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 1 - 3 out of 10 pages.

Nervous System:Anatomy:The purpose of the bony skull is to protect the brain from injury. The skull is formed from 8 bones that fuse together along suture lines. These bones include the frontal, parietal (2), temporal (2), sphenoid, occipital and ethmoid (Fig. 1). The face is formed from 14 paired bones including the maxilla, zygoma, nasal, palatine, lacrimal, inferior nasal conchae, mandible, and vomer. Similar to cables coming out the back of a computer, all the arteries, veins and nerves exit the base of the skull through holes, called foram-ina. The big hole in the middle (foramen magnum) is where the spinal cord exits.Nervous System:The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Mede up of two parts the central nervous sys-tem and the peripheral nervous system.Central nervous system:The brain and spinal cord form the control center known as the central nervous system (CNS), where information is evaluated and decisions made.
peripheral nervous system:The Peripheral nervous system (PNS) consists of the nerves and ganglia outside the brain and spinal cord. Cranial nerves and spinal cord.Sympathetic nerves:The sympathetic nervous system (SNS) is part of the autonomic nervous system (ANS), which also includes the parasympathetic nervous system (PNS). The sympathetic nervous sys-tem activates what is often termed the fight or flight response.Parasympathetic nerves:The parasympathetic nervous system(PNS) is one of the divisions of the autonomic nervous system (ANS). Sometimes called the rest and digest system, the parasympa-thetic systemconserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gas-trointestinal tract.Cranial nerves: The cranial nerves are a set of 12 paired nerves that arise directly from the brain. The first two nerves (olfactory and optic) arise from the cerebrum, whereas the remaining ten emerge from the brain stem. The names of the cranial nerves relate to their function andthey are also numerically identified in roman numerals (I-XII).There are twelve cranial nerves in total. The brain communicates with the body through the spinal cord and twelve pairs of cranial nerves. Ten of the twelve pairs of cranial nerves that control hearing, eye movement, fa-cial sensations, taste, swallowing and movement of the face, neck, shoulder and tongue muscles originate in the brainstem. The cranial nerves for smell and vision originate in the cerebrum.Parts of the brain: The brain is composed of the cerebrum, cerebel-lum, and brainstemCerebrum:The cerebrum is divided into four lobes: frontal, parietal, temporal, and occipitalThe cerebrum is the largest part of the brain and is composed of right and left hemispheres. It performs higher func-tions like interpreting touch, vision and hearing, as well as speech, rea-soning, emotions, learning, and fine control of movement.

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 10 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
Ramalingam
Tags

Newly uploaded documents

Show More

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture