HBIO 320 LECTURES 4-5 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++

HBIO 320 LECTURES 4-5 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++ Nervous system has CNS and PNS CNS brain and spinal cord PNS autonomic or somatic autonomic PNS controls self regulated action of organs and glands Types of autonomic control sympathetic and parasympathetic Somatic PNS sensory input and motor output Premotor Cortex Planning and organizing movements Contains mirror neurons Communicates with cerebellum for proprioceptive feedback After refinement from the cerebellum, premotor cortex sends signas to ____ then to the _______ thalamus primary motor cortex Primary motor cortex Initiation of movement Betz cells large pyramidal neurons of the primary motor cortex that contralaterally synapse directly on motor neurons in the lower regions of the spinal cord. Cortical Homunculus map that shows Unequal distribution of primary motor cortex control. Greater representation of hands/fingers, eyes, tongue, lips Spinal Cord: Ventral Horn Somatic upper Motor Neuron Cell Bodies Spinal cord: ventral Root Axons of somatic motor neurons project efferent signals Spinal Cord: Dorsal Root Ganglia and Dorsal Horn Sensory neurons (Afferent) Peripheral Nervous System Motor Neuron cell bodies found in brain stem or spinal cord PNS Axons project out via ventral roots all the way to skeletal muscle (Neuromuscular Junction). Branch as they near the target muscle Motor Neuron: Dendrites: Receive Signals Motor Neuron: Axon Hillock: Initiate Action Potential Motor Neuron: Axon: Send Signals (action potentials) • Schwann Cells: