ANP College Exam 5 Study Guide: CNS & PNS Concepts

Q1. What are the functions of the lobes of the brain?

Background

Topic: Central Nervous System (CNS) - Brain Anatomy

This question tests your understanding of the major lobes of the brain (frontal, parietal, occipital, temporal) and their primary functions.

Key Terms:

• Frontal lobe: Associated with reasoning, planning, movement, emotions, and problem-solving.

• Parietal lobe: Processes sensory information such as touch, temperature, and pain.

• Occipital lobe: Responsible for visual processing.

• Temporal lobe: Involved in perception and recognition of auditory stimuli, memory, and speech.

Step-by-Step Guidance

1. Identify each lobe of the brain and its anatomical location.

2. Recall the main function associated with each lobe (e.g., frontal lobe for executive functions).

3. Think about examples of tasks or behaviors controlled by each lobe.

4. Review any clinical disorders or symptoms that arise from damage to specific lobes.

Try summarizing the functions for each lobe before checking the answer!

Final Answer:

Frontal lobe: Executive functions, voluntary movement, speech production (Broca's area).

Parietal lobe: Sensory integration, spatial awareness.

Occipital lobe: Visual processing.

Temporal lobe: Auditory processing, memory, language comprehension (Wernicke's area).

Q2. Describe the organization of major regions of the brain.

Background

Topic: CNS - Brain Structure

This question is about the structural divisions of the brain, such as cerebrum, cerebellum, brainstem, and diencephalon.

Key Terms:

• Cerebrum: Largest part, divided into hemispheres and lobes.

• Cerebellum: Coordinates movement and balance.

• Brainstem: Includes midbrain, pons, medulla; controls vital functions.

• Diencephalon: Contains thalamus and hypothalamus.

Step-by-Step Guidance

1. List the major regions of the brain.

2. Describe the location and main function of each region.

3. Consider how these regions interact to control bodily functions.

4. Review diagrams or models to visualize the organization.

Try organizing the regions and their functions before checking the answer!

Final Answer:

Cerebrum: Higher cognitive functions; Cerebellum: Coordination; Brainstem: Vital functions; Diencephalon: Sensory relay and homeostasis.

Q3. Define sensation, perception, processing, adaptation, diplopia, nystagmus, ptosis lag, Bell’s palsy, and reflexes.

Background

Topic: Peripheral Nervous System (PNS) - Sensory and Motor Functions

This question tests your ability to define key terms related to sensory and motor function, as well as clinical disorders.

Key Terms:

• Sensation: Detection of stimuli by sensory receptors.

• Perception: Interpretation of sensory information by the brain.

• Processing: Integration and analysis of sensory input.

• Adaptation: Decreased response to a constant stimulus.

• Diplopia: Double vision.

• Nystagmus: Involuntary eye movement.

• Ptosis lag: Drooping of the eyelid.

• Bell’s palsy: Facial nerve paralysis.

• Reflex: Automatic response to a stimulus.

Step-by-Step Guidance

1. Write out definitions for each term using your own words.

2. Relate each term to its function or clinical significance.

3. Review examples or symptoms associated with each disorder.

4. Compare sensation and perception to understand their differences.

Try defining each term before checking the answer!

Final Answer:

Sensation: Detection; Perception: Interpretation; Processing: Integration; Adaptation: Reduced response; Diplopia: Double vision; Nystagmus: Eye movement; Ptosis lag: Eyelid droop; Bell’s palsy: Facial paralysis; Reflex: Automatic response.

Q4. What stimulates different types of receptors (e.g. chemoreceptors, exteroceptors)?

Background

Topic: PNS - Sensory Receptors

This question tests your knowledge of receptor types and their stimuli.

Key Terms:

• Chemoreceptors: Respond to chemical stimuli (e.g., taste, smell).

• Exteroceptors: Respond to external stimuli (e.g., touch, temperature).

• Mechanoreceptors: Respond to mechanical forces (e.g., pressure).

• Photoreceptors: Respond to light.

• Nociceptors: Respond to pain.

Step-by-Step Guidance

1. List the main types of sensory receptors.

2. Identify the stimulus each receptor responds to.

3. Provide examples of where each receptor is found in the body.

4. Think about how these receptors contribute to sensation and perception.

Try matching each receptor to its stimulus before checking the answer!

Final Answer:

Chemoreceptors: Chemicals; Exteroceptors: External stimuli; Mechanoreceptors: Pressure; Photoreceptors: Light; Nociceptors: Pain.

Q5. Describe steps in regeneration of nerve fibers and why spinal cord neurons cannot regenerate.

Background

Topic: PNS - Nerve Regeneration

This question tests your understanding of the process of nerve fiber regeneration and the limitations in the CNS.

Key Terms:

• Regeneration: Repair and regrowth of damaged nerve fibers.

• Schwann cells: Aid in regeneration in PNS.

• Oligodendrocytes: CNS cells that do not support regeneration.

Step-by-Step Guidance

1. Outline the steps of nerve fiber regeneration in the PNS (e.g., Wallerian degeneration, axon regrowth).

2. Explain the role of Schwann cells in guiding regrowth.

3. Discuss why regeneration does not occur in the CNS (e.g., inhibitory environment, lack of supportive cells).

4. Compare the environments of PNS and CNS for nerve repair.

Try outlining the steps and reasons before checking the answer!

Final Answer:

PNS: Wallerian degeneration, Schwann cell guidance, axon regrowth; CNS: No regeneration due to inhibitory factors and lack of Schwann cells.