@studymed.zone: The nervous system is the control and coordination system of the human body. Its structural and functional unit is the neuron (nerve cell). It is divided into two main parts: Central Nervous System (CNS) and Peripheral Nervous System (PNS). The CNS includes the brain and spinal cord. The brain controls thinking, memory, balance, and involuntary actions. The cerebrum is the largest part and controls intelligence and voluntary actions, while the cerebellum maintains balance and posture. The medulla oblongata controls involuntary activities like heartbeat and breathing. The spinal cord controls reflex actions. The Peripheral Nervous System connects the CNS to the rest of the body and includes 12 pairs of cranial nerves and 31 pairs of spinal nerves. It has two divisions: somatic nervous system (controls voluntary actions) and autonomic nervous system (controls involuntary actions). The autonomic system further includes the sympathetic (fight or flight) and parasympathetic (rest and digest) systems. The enteric nervous system is called the “second brain” and controls digestion. #reels #trending #nervoussystem #medical #student