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16 Cards in this Set
- Front
- Back
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2nd fx of spinal cord & where does it take place |
Spinal reflexes
Gray matter |
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What is a reflex & examples |
Fast involuntary predictable
Muscle contraction. Glandular secretion. In response to environmental change.
Can be spinal or cranial & somatic/ automatic |
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Components of a reflex arc |
Sensory receptor Sensory neuron Integrating center Motor neuron Effector |
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Somatic spinal reflexes |
Stretch reflex Tendon r Flexor withdrawal r Crossed extensor r
All show reciprocal innervation |
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2 neuron or monosynaptic reflex |
1 sensory neuron 1 motor n
Ex: stretch reflex - patellar reflex |
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Stretch reflex |
Ipsilateral
Important maintaining muscle tone |
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White matter of s cord consists of |
Bundles of myelinated axons of neurons |
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What divides the white matter |
Anterior median fissure (wide) Posterior median sulcus (narrow) |
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What does gray matter consist of & what's it shaped like |
Shape like H or butterfly
Consists of dendrites& cell Bodies of neurons. In myelinated axons. Neuroglia. |
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Gray commissure |
Forms crossbar of H |
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Central canal |
In center of gray commissure
Extends entire length of s cord
Filled w cerebrospinal fluid |
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Anterior white commissure |
Connects white matter of right & left side of spinal cord |
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Where's most gray matter |
Cervical & lumbar segments
Bc these segments responsible for sensory & motor innervation of upper limbs |
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Where is there more sensory & motor tracts? |
In upper segments of spinal cord |
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Where is the most white matte r |
Decreased from cervical to sacral segments of spinal cord |
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2 reasons for variation in spinal cord white matter |
1. Ascending from sacral to cervical, more ascending axons added to white matter to form more sensory tracts.
2. Descending from cervical to sacral, motor tracts decrease thickness bc more descending axons leave motor tracts to synapse with gray matter. |
