Forensic Science Assignment 3 Essay

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FORENSIC SCIENCE

3.1

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The frontalis, orbicularis oris, laris oculi, buccinators and zygomaticus are muscles that are responsible for showing facial expressions such as surprise, anger, fear, disgust, amongst other emotions.

The temporalis and the masseter muscle are responsible for chewing movements.

The sterncleidomastoid and trapezius are neck muscles and can be associated with the throat.

3.2

The principal organs that comprise the nervous system are the brain, spinal cord, nerves and ganglia. These organs also consist of various tissues including nerve, blood and connective tissue. All together the organs and various tissues carry out the activities of the nervous system.

The activities of the nervous …show more content…
The second is serving as a reflex centre. The reflex arc is the functional unit of the nervous system. Many reflexes are mediated in the spinal cord without going to the higher brain centres as they are responses to stimuli and do not require conscious thought and require more quickly than reactions that require thought process.

The second of the two subdivisions is the peripheral nervous system. The organs that make up this system are the nerves and ganglia. Nerves are bundles of nerve fibres and ganglia are collections of nerve cells outside the central nervous system.

The peripheral nervous system is further divided into a sensory division which transmits impulses from the peripheral organs to the central nervous system and a motor division which transmits impulses from the central nervous system out to the peripheral organs to cause an affect or action.

The peripheral nervous system consists of the nerves that branch out from the brain and spinal cord and it is these nerves that form the communication network between the central nervous system and the body parts. The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system. The somatic nervous system consists of nerves that go to the skin and muscles and is involved in conscious activities. The autonomic nervous system consists of nerves that connect the central nervous system to the visceral organs such as the
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