The Brain: Anatomy and Function

Introduction

• The brain is part of the nervous system and coordinates all body functions.
• Adult human brain: ~3-pound gelatinous mass of fat and protein.
• Comprised of four main regions: cerebrum, cerebellum, brainstem, diencephalon.

Cerebrum

• Largest part, over 3/4 of brain's volume.
• Consists of neurons and nerve fibers.
• Controls higher functions: learning, reasoning, speech, sight, and hearing.

Cerebellum

• Located under the cerebrum.
• Contains nerve cells and fibers.
• Coordinates muscle movements; maintains balance and posture.

Brainstem

• Lies in front of the cerebellum; anchors the brain to the spinal cord.
• Collection of structures: pons, midbrain, medulla oblongata.
• Controls vital bodily functions: cardiac activity, respiration, digestion, sleep.

Diencephalon

• Located above the brainstem; core of the brain.
• Size of an apricot; several structures: thalamus, hypothalamus, pituitary gland.
• Governs sensations, weight, energy, instinctual behaviors.

Brain Protection

• Blood-brain barrier: semipermeable wall allowing specific chemicals into the brain.

Brain Health

• Risks: tumors, dementia.
• Improvement: physical activity, balanced diet.
• Can preserve cognitive function and reduce Alzheimer's risk.

Conclusion

• Despite its small size, the brain plays a crucial role in bodily functions and overall well-being.