BIO 2111 (ANP) Lecture Test 4 Study Guide – Step-by-Step Guidance

Q1. 5th Cranial Nerve

Background

Topic: Cranial Nerves (Central Nervous System)

This question tests your knowledge of the 5th cranial nerve, including its name, Roman numeral, sensory and motor functions, origin in the brainstem, and its relative size compared to other cranial nerves.

Key Terms and Concepts:

• Cranial nerves: 12 pairs of nerves that emerge directly from the brain.

• Roman numerals: Used to number cranial nerves (I–XII).

• Sensory vs. motor functions: Sensory nerves carry information to the brain; motor nerves carry commands from the brain to muscles.

• Brainstem: The part of the brain where most cranial nerves originate.

Step-by-Step Guidance

1. Recall the name and Roman numeral of the 5th cranial nerve. (Hint: It is responsible for facial sensation and chewing.)

2. List the main sensory functions of this nerve. Think about what areas of the face or head it provides sensation to.

3. List the main motor functions. Consider what muscles or actions this nerve controls.

4. Identify the part of the brainstem from which this nerve originates. Is it the midbrain, pons, or medulla?

5. Compare its size to other cranial nerves. Is it the largest, smallest, or somewhere in between?

Try solving on your own before revealing the answer!

Q2. Cerebral Lobes

Background

Topic: Cerebrum Structure and Function

This question tests your ability to identify the five lobes of the cerebrum, provide a function for each, and name the structure that connects the two hemispheres.

Key Terms and Concepts:

• Lobes of the cerebrum: Distinct regions of the brain, each with specialized functions.

• Corpus callosum: The structure that connects the left and right cerebral hemispheres.

Step-by-Step Guidance

1. List the five lobes of the cerebrum. (Hint: Four are named after skull bones; the fifth is deeper.)

2. For each lobe, write one primary function. Think about sensory, motor, or association roles.

3. Identify the structure that allows communication between the two hemispheres. Consider the large bundle of nerve fibers in the center of the brain.

Try solving on your own before revealing the answer!

Q3. Parasympathetic vs Sympathetic Divisions of the ANS

Background

Topic: Autonomic Nervous System (ANS) Divisions

This question asks you to compare and contrast the parasympathetic and sympathetic divisions in terms of speed, effects, neurotransmitters, CNS origin, and neuron lengths.

Key Terms and Concepts:

• Sympathetic division: "Fight or flight" responses.

• Parasympathetic division: "Rest and digest" responses.

• Neurotransmitters: Chemical messengers (e.g., acetylcholine, norepinephrine).

• Presynaptic (preganglionic) and postsynaptic (postganglionic) neurons: Parts of the two-neuron pathway.

Step-by-Step Guidance

1. Compare the speed of response for each division. Which is faster and why?

2. Give one example of a body effect for each division (e.g., heart rate, digestion).

3. List the main neurotransmitters used by each division.

4. Identify the CNS origin/components for each division (e.g., thoracolumbar vs. craniosacral).

5. Compare the lengths of presynaptic and ganglionic neurons in each division.

Try solving on your own before revealing the answer!

Q4. Autonomic Pathways and Ganglia

Background

Topic: Autonomic Nervous System Pathways

This question tests your understanding of the two-neuron pathway in the ANS, the locations of ganglia, neuronal divergence, and examples of organ responses.

Key Terms and Concepts:

• Preganglionic neuron: The first neuron in the ANS pathway.

• Postganglionic neuron: The second neuron in the pathway.

• Ganglia: Clusters of neuron cell bodies outside the CNS.

• Neuronal divergence: One preganglionic neuron synapses with many postganglionic neurons.

Step-by-Step Guidance

1. Describe the general two-neuron pathway used by the ANS. What are the roles of the preganglionic and postganglionic neurons?

2. Compare the locations of sympathetic and parasympathetic ganglia. Are they close to the spinal cord or the target organ?

3. Explain the concept of neuronal divergence in the sympathetic division. Why is this important for the body's response?

4. Provide one example of an organ response controlled by each division (sympathetic and parasympathetic).

Try solving on your own before revealing the answer!

Q5. Olfactory Pathway

Background

Topic: Special Senses – Smell

This question asks you to describe the olfactory pathway in detail and identify the location of the olfactory sensory cortex.

Key Terms and Concepts:

• Olfactory receptors: Sensory neurons in the nasal cavity.

• Olfactory bulb and tract: Structures that transmit smell information to the brain.

• Olfactory cortex: The brain region that processes smell.

Step-by-Step Guidance

1. Describe the path of an odor molecule from the nasal cavity to the olfactory receptors.

2. Explain how the signal travels from the receptors to the olfactory bulb.

3. Trace the pathway from the olfactory bulb through the olfactory tract to the brain.

4. Identify the location of the olfactory sensory cortex in the brain.

Try solving on your own before revealing the answer!

Q6. Taste Sensations

Background

Topic: Special Senses – Taste

This question tests your knowledge of the five primary taste sensations, the types of lingual papillae, and the cranial nerves involved in taste.

Key Terms and Concepts:

• Taste sensations: The basic types of tastes detected by the tongue.

• Lingual papillae: Structures on the tongue that contain taste buds.

• Cranial nerves: Nerves that carry taste information to the brain.

Step-by-Step Guidance

1. List the five primary taste sensations detected by the tongue.

2. Name the four types of lingual papillae and note which contain taste buds.

3. List the three cranial nerves involved in taste and the regions of the tongue they serve.

Try solving on your own before revealing the answer!