Lectures3+4-Chapter_2-BiologicalFoundations

Involved in coordination and finetuning of motor

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Unformatted text preview: brain. Involved in coordination and finetuning of motor signals, and motor learning. 21 Subcortical Structures: 22 Collections of brain cells that reside below the cerebral cortex - 3 Brainstem Collective term for structures between the thalamus and the spinal cord, including the midbrain, pons, and medulla. Major connecting area for cranial nerves (somatosensory info from face, head, neck; auditory, balance (vestibular) and taste information, control of heart, breathing and many other bodily functions MIDBRAIN PONS, MEDULLA 3-D Views of Pons & Medulla PONS (higher) MEDULLA (lower) 23 Subcortical Structures: Collections of brain cells that reside below the cerebral cortex - 4 Spinal Cord Lowermost component of the CNS; extends inside the vertebral column. Transmits sensory and motor information to and from the brain Has different fiber tracts for sensory and motor information Segmented organization – a total of 31 pairs of spinal nerves carry sensory and motor signals to and from the spinal cord (responsible for entire body below the neck) Spinal nerves belong to the PNS 24 Summary Diagram of Cortical and Subcortical Structures This is a medial view (looking out from the center) of the right brain hemisphere; the brainstem includes the midbrain, pons, and medulla; it extends into spinal cord at lower margin. The cerebellum is foliated (note the leaf-like folia in cross section) and wraps around brain stem. 25 26 General principles of sensory processing All sensory systems share features regarding how their inputs are processed: They extract information on modality, location, intensity, and duration. Different sensory stimuli generate different perceptual experiences due to the fact that different brain structures and/or combinations of brain structures are stimulated by each sensory modality. 27 Sensory coding and modality representation We have five major sensory modalities that can capture the energy present in mechanical (touch, feeling,pain), chemical (taste, smell, detection of noxious chemicals), sound (auditory), and light (visual) stimuli. Anoth...
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This document was uploaded on 02/16/2014.

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