Forensic Science Assignment 3 Essay

2087 Words Mar 16th, 2011 9 Pages
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
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Because they are so vitally important, the brain and spinal cord, located in the dorsal body cavity, are encased in bone for protection. The brain is in the cranial vault and the spinal cord is in the vertebral canal of the vertebral column. In addition to bone, the central nervous system is surrounded by connective tissue membranes, called meninges and by cerebrospinal fluid.

The brain is divided into the cerebrum, diencephalon, brain stem and cerebellum.

The largest portion of the brain is the cerebrum which is divided into two cerebral hemispheres. The two hemispheres are two separate entities.

The diencephalon is centrally located and is nearly surrounded by the cerebral hemispheres. The thalamus, which makes up about 80% of the diencephalon, consists of two oval masses of grey matter that serve as relay stations for sensory impulses, except for the sense of smell, going to the cerebral cortex.

The cerebellum is the second largest portion of the brain. Three bundles of myelinated nerve fibres, called cerebellar peduncles, form communication pathways between the cerebellum and other parts of the central nervous system.

The spinal cord extends from the base of the skull to the level of the fist lumbar vertebra and like the brain, it is surrounded by bone, meniges and cerebrospinal fluid. The spinal cord is divided into 31 segments and each segment gives rise to a pair of spinal
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