07-NervesS11b

07-NervesS11b - The Nervous System Lecture 7/Chapter 44...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
The Nervous System Lecture 7/Chapter 44
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Responding to stimuli 刺激物 All animals must be able to respond to environmental stimuli Sensory receptors 感觉感受器 : detect stimulus Motor effectors: respond to it The nervous system links the two Consists of neurons 神经元 and supporting cells
Background image of page 2
3 Types of neurons 神经元 Vertebrates have three types of neurons Sensory neurons: afferent neurons that carry impulses to central nervous system (CNS) Motor neurons: efferent neurons that carry impulses from CNS to effectors (muscles and glands) Interneurons 中间神经元 (association neurons) provide more complex reflexes and associative functions (learning and memory) Connect sensory and motor neurons
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Figure 44.1
Background image of page 4
5 Nervous System Organization The CNS consists of: interneurons that make up the brain and spinal cord The peripheral nervous system 周围神经系统 (PNS) consists of sensory and motor neurons PNS collects information and carries out response Somatic NS 躯体神经系统 : stimulates skeletal muscles Autonomic NS 自主神经系统 : stimulates smooth and cardiac muscles, as well as glands
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Neuron anatomy Neurons have a common basic structure Cell body : enlarged part containing nucleus Thin extensions from body Two types of projections: dendrites 末端神经 and axon 轴突 Dendrites: multiple short, extensions that receive stimuli Axon : single, long extension that conducts impulses away from cell body Supporting cells are wrapped multiple times around axon—layered membrane forms a myelin sheath 髓鞘
Background image of page 6
7 Neuron anatomy Figure 44.3
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Neuroglia 神经胶 ( Neurons are supported both structurally and functionally by: two types of neuroglia cells Schwann cells 施万细胞 and oligodendrocytes 突胶质细胞 produce
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 34

07-NervesS11b - The Nervous System Lecture 7/Chapter 44...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online