medulla oblongata
the medulla oblongata (mē - duah ob\long - gātah) is the most inferior part of the brain stem. it merges into the (1 ) cord below without any obvious change in structure. like the pons, the medulla is an important fiber tract area. additionally, the medulla is the area where the important pyramidal tracts (motor fibers) cross over to the opposite side. the medulla also contains many nuclei that (2 ) vital visceral activities. it contains centers that control heart rate, blood pressure, breathing, swallowing, and vomiting, among others. the fourth ventricle lies posterior to the pons and medulla and anterior to the cerebellum.
reticular formation: extending the entire length of the brain stem is a diffuse mass of gray matter, the reticular formation. the neurons of the (3 ) formation are involved in motor control of the visceral organs—for example, controlling smooth muscle in the digestive tract. a special group of reticular formation neurons, the reticular activating system (ras), plays a role in (4 ) and the awake/sleep cycle (figure 7 16b). the ras also acts as a filter for the flood of sensory inputs that streams up the spinal cord and brain stem daily. weak or repetitive signals are filtered out, but unusual or strong impulses do reach consciousness. damage to this (5 ) can result in prolonged unconsciousness (coma)

1. reticular 2 consciousness 3 area 4 spinal 5 regulate

1 consciousness 2 area 3 spinal 4 regulate 5 reticular

1 regulate 2 reticular 3 consciousness 4 area 5 spinal

1 spinal 2 regulate 3 reticular 4 consciousness 5 area

1 area 2 spinal 3 regulate 4 reticular 5 consciousness

Question

medulla oblongata
the medulla oblongata (mē - duah ob\long - gātah) is the most inferior part of the brain stem. it merges into the (1 ) cord below without any obvious change in structure. like the pons, the medulla is an important fiber tract area. additionally, the medulla is the area where the important pyramidal tracts (motor fibers) cross over to the opposite side. the medulla also contains many nuclei that (2 ) vital visceral activities. it contains centers that control heart rate, blood pressure, breathing, swallowing, and vomiting, among others. the fourth ventricle lies posterior to the pons and medulla and anterior to the cerebellum.
reticular formation: extending the entire length of the brain stem is a diffuse mass of gray matter, the reticular formation. the neurons of the (3 ) formation are involved in motor control of the visceral organs—for example, controlling smooth muscle in the digestive tract. a special group of reticular formation neurons, the reticular activating system (ras), plays a role in (4 ) and the awake/sleep cycle (figure 7 16b). the ras also acts as a filter for the flood of sensory inputs that streams up the spinal cord and brain stem daily. weak or repetitive signals are filtered out, but unusual or strong impulses do reach consciousness. damage to this (5 ) can result in prolonged unconsciousness (coma)

1. reticular 2 consciousness 3 area 4 spinal 5 regulate

1 consciousness 2 area 3 spinal 4 regulate 5 reticular

1 regulate 2 reticular 3 consciousness 4 area 5 spinal

1 spinal 2 regulate 3 reticular 4 consciousness 5 area

1 area 2 spinal 3 regulate 4 reticular 5 consciousness

Accepted Answer

# Brief Explanations:
The medulla oblongata merges into the spinal cord. Nuclei in the medulla regulate vital visceral activities. Neurons of the reticular formation are involved in visceral motor - control. The reticular activating system (RAS) is related to consciousness and the awake/sleep cycle, and damage to the RAS area can cause coma.
# Answer:
1. spinal
2. regulate
3. reticular
4. consciousness
5. area

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