Functions of the Nervous System
Sensory input, Integration, Control of muscles and glands, mental activity (thinking), Homeostasis (Maintenance)
sensory receptors respond to stimuli
brain and spinal cord process stimuli
Central Nervous System (CNS) consist of...
brain & spinal chord
Peripheral Nervous System (PNS) consists of...
All neurons outside the CNS (nerves to the face, ganglia, Nerves to upper limb, nerves to lower limb)
Sensory division (afferent-toward)
carry incoming information to the brain (conducts action potentials from sensory receptors to the CNS; these neurons are called sensory neurons)
Motor division (efferent-away)
Carrying outgoing information from the brain (conducts action potentials from the CNS to effector organs, these neurons are motor neurons)
Two subdivisions of the Autonomic Nervous system are...
Sympathetic Nervous System (hall ass or kick ass) and Parasympathetic Nervous System (rest or digest)
The Enteric System is...("brain" of the Gut)
subdivision of peripheral nervous system, has both sensory & motor neurons which are contained within the digestive system, can function without input from CNS, generally integrated within the CNS by sensory and motor neurons
Two Major cells in the nervous system...
Neurons & Neuroglia
Neuron (work horse)
Neuron=nerve cell, require oxygen and glucose (energy), receive input, process input & produce a response
The Myelin sheath is formed of " " cells
types of neurons...
multipolar, bipolar, and pseudo-unipolar
sustentacular tissue that surrounds and supports neurons in the central nervous system
Characteristics of Neuroglia
supporting cells of neurons, more numerous than neurons, can undergo cell division, 5 types
five types of neuroglia
astrocytes, ependymal cells, microglia, oligondendrocytes, and schwann cells