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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesSept 2011 The simple nervous system spinal reflexes involves a pain reflex The signal doesnt need to travel to the brain it only needs to reach the spinal cord It is fast and important for survival The complex nervous system has three overlapping functions It uses sensory receptors to monitor changes or stimuli The gathered information is called a sensory input afferent and the information is carried from the body to the brain and spinal cord Integration is where the nervous system processes the sensory input or information and decides what to do It dictates a response by activating the effector organs This response is called motor output efferent and the processed information is carried away from the brain and spinal cord to the body Anhidrosis is a dysfunction of the nervous system where the person cant feel pain heat and cold The part of the nervous system that is not functioning is the sensory input It disrupts the development if nerve fibres that carry sensation of pain heat and cold to the brain The person doesnt sense pain and so they dont display any pain reflexes or movement The nervous system is divided into two anatomical parts The central nervous system CNS consists of the brain occupies cranium and the spinal cord occupies the vertebral canal The CNS is the integrating and command centre of the nervous system It receives incoming sensory signals interprets these signals and dictates motor responses The peripheral nervous system PNS consists of ganglia and nerves cranial nerves carry signals to and from the brain spinal nerves carry signals to and from the spinal cord Theses peripheral nerves serve as communication lines that link all regions of the body to the CNS Sensory or afferent signals are picked up by sensory receptors located throughout the body and carried by nerves of the PNS into the CNS Motor or efferent signals are carried away from the CNS by nerves of the PNS t
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