module 9: organization of nervous tissue

what is the job of the axon?

where the cell signals transmit to another cell or target tissue

what are dendrites?

they are short extensions that receive information

what do sensory receptors do?

sense changes through sensory receptors

what do motor receptors do?

they respond the stimuli - eg. glands and muscles

what do integrative receptors do?

they analyze incoming sensory receptors and decide what sensory information is needed to be focused on

eg. when you put on a fuzzy sweater you aren’t focused on it all day

what are the components of the nervous system?

• brain

• spinal cord

• nerves

• sensory receptors

what are the 2 divisions of the nervous system?

the central nervous system

the peripheral nervous system

what does the central nervous system contain

the brain and spinal cord

what does the peripheral nervous system contain?

sensory receptors and nerves

what are sensory receptors?

they are specialized cells that can detect things like pain, temp etc

what are nerves?

a bundle of axons and their sheaths that connect the CNS to sensory receptors

how many cranial nerves do we have and where are they found?

they originated in the brain and there are 12 of them

how many spinal nerves are there and where do they orginate?

31 and they originate from the spinal cord

what is a ganglion?

collection of neurons of cell bodies outside the CNS

What are plexus?

an extensive network of axons and sometimes neuron cell bodies located outside of CNS

what are the 2 divisions of the PNS

sensory and motor

what are sensory receptors also called

afferent

what do sensory receptors do?

they transmit action potentials from receptors to the CNS

what do motor receptors do?

they transmit action potentials from the CNS to effctors like muscles

what is the motor receptor also known as?

effrent

what are the divisions of the motor receptors

• somatic nervous system

• autonomic nervous system

what does the somatic nervous system control?

skeletal muscle - you are able to control the somatic nervous system

what does the autonomic nervous system control

heart, smooth mussels and glands - things you cant conrtol

what are the two divisions of sensory receptors

1. general senses

2. special senses

the role of sensory receptors is to take external environment and transmit it to our internal enviornment

what do general senses do/control?

they are receptors throughout many parts of the body that control pressure, temp etc

what do sensory receptors do?

they are specific receptors in specific organs eg. vision (only located in the eye)

what kind of