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what are membranes made up of?
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dura mater
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dec 1st test
unit 3
| Question | Answer |
|---|---|
| what are membranes made up of? | connective tissue and epithelial |
| dura mater | tough mater; attaches to cranium |
| acrachnoid | spider web like |
| pia mater | nurishes |
| what are the 3 membranes | dura mater, pia mater, arachnoid materthese 3 form the meninges |
| ectoderm | germ layer of nervous tissue that starts the embryo |
| amytotic | this is why the brain and spinal cord need to be protected |
| ans | visceral nervous system |
| visceral | internal, guts or organs |
| skeletal muscles | these muscles are what makes you move your hand away from a hot stove itf you touch it |
| somatic nervous system | skeletal muscle |
| somo | body |
| cephalization | head area |
| contralateral | R side of the body controls the L side and the L side controls the R side |
| How many spinal nerves do we have? | 31 and they are all mixed |
| 12 pair of cranial nerves | 5 motor 3 snesory 4 mixed |
| how big is a neuron compared to a nerve | very small |
| sensory nerves | to cns and they are only dendrites |
| motor nerves | away from CNS and they are only axons |
| Nerve | a bundle of neruon fibers (they have processes like dendrites and axon) theis is present in nervous system |
| where are internerurons found? | in the spinal nerve |
| fact | nerves do not have cell bodies they have processes |
| facial cranial nerves | mixed nerves; they ahve both dendrites and axons |
| Functional Classification of Neurons | Senory (or afferent), MOTOR (or efferent), INTERNEURONS (or association) |
| Senory neruron | transmit impulses from sensory receptors in the skin or internal organs towards cns |
| Motor Neuron | carry impulses away from the CNS to the effector organs ofthe body periphery |
| Interneuron | lie b/t motor and sensory neurons and shuttle signals thru CNS pathways |
| synapse | "to clasp or join" a junction that mediates info transfer from one neuron to the next |
| electrical synapse | less common variety; consist of gap junctions like those found between certain other body cells |
| chemcial synapse | specialized for release and reception of chemical neurotransmiters made up of 2 parts ; a knoblike axon and a neurotransmitter receptor region on the membrane of a dendrite |
| resting and polarized | a membrane that is not conducting and impulse |
| what protects and nurishes neurons? | astrocytes |
| classification of neurons | by structure and function |
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lilwilkerson
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