Differentiate the following: Ganglia and Basal ganglia, White matter and Gray matter, Tracts and Nerves

QUESTION 1: a) Differentiate the following: Ganglia and Basal ganglia: • Ganglia are collections of neuron cell bodies located in the Peripheral Nervous System (PNS). They serve as relay stations for nerve impulses. • Basal ganglia are specific clusters of neuron cell bodies (nuclei) located deep within the Central Nervous System (CNS), particularly in the cerebrum. They are primarily involved in motor control, learning, and executive functions. White matter and Gray matter: • White matter consists primarily of myelinated axons, which are nerve fibers covered in a fatty myelin sheath. This myelin gives it a whitish appearance and facilitates rapid transmission of electrical signals between different brain regions and to the rest of the body. • Gray matter consists mainly of neuron cell bodies, dendrites, unmyelinated axons, and glial cells. It is where most neural processing, such as thinking, memory, and sensation, occurs. Tracts and Nerves: • Tracts are bundles of axons found within the Central Nervous System (CNS). They transmit specific types of information between different parts of the brain and spinal cord. • Nerves are bundles of axons found within the Peripheral Nervous System (PNS). They transmit signals between the CNS and the rest of the body (muscles, organs, sensory receptors). b) Mrs X frequently stays up late studying, leading to inconsistent sleep patterns and daytime fatigue. What is the best way to regulate her sleep-wake cycle? The best way to regulate Mrs. X's sleep-wake cycle is to establish and maintain consistent sleep hygiene practices. This includes: • Maintaining a regular sleep schedule: Going to bed and waking up at the same time every day, even on weekends. • Creating a conducive sleep environment: Ensuring the bedroom is dark, quiet, cool, and comfortable. • Avoiding stimulants: Limiting caffeine and nicotine, especially in the afternoon and evening. • Limiting screen time: Avoiding electronic devices (phones, tablets, computers) at least an hour before bedtime due to blue light emission. • Engaging in regular physical activity: Exercising during the day, but avoiding intense workouts close to bedtime. • Establishing a relaxing bedtime routine: Activities like reading, taking a warm bath, or listening to calming music. • Limiting naps: If naps are necessary, keeping them short (20-30 minutes) and early in the afternoon. c) Draw a diagram of a nerve cell (5 marks) A diagram of a nerve cell (neuron) should include the following key components: • Cell Body (Soma): The main part of the neuron containing the nucleus. • Nucleus: Contains the genetic material of the neuron. • Dendrites: Branch-like extensions that receive signals from other neurons. • Axon: A long, slender projection that transmits electrical signals away from the cell body. • Myelin Sheath: A fatty insulating layer that covers the axon, speeding up signal transmission. • Nodes of Ranvier: Gaps in the myelin sheath along the axon. • Axon Terminals (Synaptic Terminals): The end of the axon where neurotransmitters are released to communicate with other cells. d) List 3 differences between Glial cells and neurons (3 marks) Here are three differences between glial cells and neurons: • Function: Neurons are primarily responsible for transmitting electrical and chemical signals throughout the nervous system, forming the basis of communication. Glial cells (neuroglia) provide support, protection, and nourishment to neurons, maintaining the overall health and function of the nervous system. • Signal Transmission: Neurons generate and conduct action potentials (nerve impulses). Glial cells do not generate or transmit action potentials; instead, they modulate neuronal activity and maintain the extracellular environment. • Mitotic Activity: Most mature neurons are post-mitotic, meaning they generally do not divide or replicate. Glial cells, however, retain the ability to divide throughout life, which is important for repair and response to injury. QUESTION 2: a) Write briefly on the following: i. Fungiform papillae: These are mushroom-shaped projections found predominantly on the tip and sides of the tongue. They are reddish in color due to a rich blood supply and contain taste buds, making them important for the sensation of taste. ii. Filiform papillae: These are the most numerous papillae on the tongue, covering most of its dorsal surface. They are cone-shaped, elongated, and provide a rough texture that aids in manipulating food. Unlike other papillae, filiform papillae do not contain taste buds. iii. Circumvallate papillae: These are large, dome-shaped papillae arranged in a V-shape at the back of the tongue, just anterior to the sulcus terminalis. Each circumvallate papilla is surrounded by a trench, and their walls contain numerous taste buds. iv. Foliate papillae: These are leaf-like folds or ridges located on the lateral margins of the posterior tongue. They are more prominent in young children and contain taste buds, which can degenerate with age. b) Discuss in a table the intrinsic and extrinsic muscles of the tongue under NAME and FUNCTION. | Muscle Type | Name of Muscle | Function | | :---------- | :------------- | 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