Human Nervous System: Brain and Spinal Cord Functions

Spinal Cord and Reflexes

The Spinal Cord processes spinal reflexes. It serves as a pathway for sensory nerve impulses directed to the brain and motor nerve impulses traveling from the brain to the effectors.

Brain Stem Regions

• Medulla Oblongata: Contains the cardiovascular center, which controls heartbeat frequency and strength, blood vessel diameter, and the respiratory center.
• Pons: Contains the apneustic and pneumotaxic areas. The pneumotaxic area limits the duration of inspiration to facilitate breathing, while the apneustic area extends inspiration and inhibits expiration.
• Mesencephalon (Midbrain): Contains reflex centers for eye, head, and neck movements in response to visual and auditory stimuli.

Diencephalon: The Brain's Coordinator

• Thalamus: The relay station where sensory information arrives, allowing the perception of pain, temperature, and pressure before reaching the cortex.
• Hypothalamus: A regulator of homeostasis. It controls smooth muscle and heart contractions, glandular secretion, body temperature, hunger, thirst, and sleep-wake cycles.

Cerebellum and Cerebrum

• Cerebellum: Controls skeletal muscle contractions necessary for coordination, posture, balance, and precise movements.
• Cerebrum: Interprets sensory impulses, controls voluntary muscle movement, and manages complex processes like memory, reasoning, and intellect.

Cerebral Lobes

1. Frontal: Logical thought, future perception, moral consciousness, and short-term memory.
2. Parietal: Long-term memory, balance, and learning.
3. Temporal: Limb and spatial perception.
4. Occipital: Primary and secondary visual cortex for object recognition.

Hemispheres

• Left Hemisphere: Responsible for logical thinking, information processing, and language development.
• Right Hemisphere: Responsible for emotional and psychological development.

Functions of the Nervous System

• Sensitive: Detecting stimuli from both inside and outside the body.
• Integrative: Analyzing captured information to make decisions.
• Motor: Responding to stimuli and controlling voluntary muscle contraction.