NERVOUSSYSTEM(神经组织)PPT剖析.pptx

NERVOUS SYSTEM;FUNCTIONS OF THE NERVOUS SYSTEM;DIVISIONS OF THE NERVOUS SYSTEM;CELLS OF THE NERVOUS SYSTEM;CELLS OF THE NERVOUS SYSTEM;CELLS OF THE NERVOUS SYSTEM;ELECTRICAL SIGNALS AND NEURAL PATHWAYS;Action Potentials: An action potential occurs when the charge across the cell membrane is briefly reversed. ;ELECTRICAL SIGNALS AND NEURAL PATHWAYS;ELECTRICAL SIGNALS AND NEURAL PATHWAYS;ELECTRICAL SIGNALS AND NEURAL PATHWAYS;ELECTRICAL SIGNALS AND NEURAL PATHWAYS;THE SPINAL CORD;THE SPINAL CORD;SPINAL CORD REFLEXES;SPINAL NERVES;BRAIN;BRAIN: Brainstem and Cerebellum;BRAIN: Brainstem and Diencephalon;BRAIN: Diencephalon and Cerebrum;BRAIN: Cerebrum and Cerebellum;BRAIN: Cerebral Hemispheres;The CNS constantly receives sensory input. ASCENDING TRACTS: Spinothalamic tract – pathways for pain, temperature, light touch, pressure, tickle and itch sensation. Dorsal column – pathways for proprioception, touch, deep pressure and vibration. Spinocerebellar – proprioception to cerebellum. ;UPPER MOTOR NEURON have cell bodies in the cerebral cortex. LOWER MOTOR NEURON have cell bodies in the anterior horn of the spinal cord gray matter. DESCENDING TRACTS: Direct tracts – muscle tone, skilled movements of the hands and trunk. Indirect tracts – movement coordination, posture, balance and movement in response to visual reflexes. ;SENSORY AND MOTOR AREAS OF THE CEREBRAL CORTEX;CSF: cerebrospinal fluid – bathes the brain and S.C.;CRANIAL NERVES;ANS Autonomic Nervous System