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ANAT 2451
Nov 14, 2023
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Anatomy Notes: Peripheral Nervous System (PNS) Peripheral Nervous System (PNS) ------------------------------- Overview: - The PNS consists of all the nerves that branch out from the brain and spinal cord. - It is responsible for connecting the CNS to the limbs and organs. Components: 1. Nerves: - Bundles of axons that transmit signals from the CNS to the rest of the body and vice versa. 2. Ganglia: - Clusters of neuronal cell bodies located outside the CNS. Functions: - The PNS is divided into the sensory (afferent) and motor (efferent) divisions. - Sensory division: Transmits sensory information from the body to the CNS. - Motor division: Transmits motor commands from the CNS to the muscles and glands. Subdivisions of the Motor Division: 1. Somatic Nervous System: - Controls voluntary movements by activating skeletal muscles. 2. Autonomic Nervous System:
- Controls involuntary body functions. - Divided into the sympathetic and parasympathetic nervous systems. Sympathetic Nervous System: - Activates the 'fight or flight' response during stress or danger. Parasympathetic Nervous System: - Controls 'rest and digest' activities during relaxed states.
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