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14 Cards in this Set
- Front
- Back
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Describe type 1 sensory neuron fibers |
Muscle spindle & Golgi tendon organ
Proprioception |
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Describe type 2 sensory neuron fibers |
Muscle spindles - proprioception
Meissner's corpuscle, Merkel's receptors - Superficial touch
Pacinian corpuscle, Ruffini ending - Deep touch, Vibration
Hair receptor - touch, vibration
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Describe type 3 sensory neuron fibers |
Bare nerve endings
Pain, Cool Temperature, Itch |
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Describe type 4 sensory neuron fibers |
Bare Nerve endings
Pain, Warm Temperature, Itch |
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Describe the DCML tract |
ascends in the dorsal column Input: Aα & Aβ primary afferent fibers Primary cell body: dorsal root ganglia (ipsilateral) secondary cell body: nucleus gracilis or cuneatus (ipsilateral) Decussation (crossing): internal arcuate fibers of caudal medulla Tertiary | target: VPL & lateral nucleus of thalamus and Somatosensory cortex lower extremity axons enter at the medial portion of the dorsal column secondary cell body in fasciculus gracilis upper extremity axons enter at the lateral portion of the dorsal column secondary cell body in fasciculus cuneatus |
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Describe the Spinothalamic tract |
Input: Group III (Ad) and IV (C) primary afferent fibers Primary cell body: Dorsal root ganglia Secondary cell body: Dorsal horn Decussation: Anterior white commissure of the spinal cord Tertiary | Target: Ventroposterior lateral (VPL) and Intralaminar nuclei of thalamus |
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Describe the Dorsal spinal cerebellar pathway |
Primary: Dorsal root ganglia
Secondary: Dorsal root ganglia, Clark's Column, Spinal nerves entering
Tertiary: Cerebellum |
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Describe the cuneocerebellar pathways |
Primary: Dorsal root ganglia
Secondary: Accessory Cuneate nucleus; central processes of spinal nerves enter at segments C2-T5 ascend in fascicular cutaneous. |
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Describe the sensory modality carried by these pathways |
DSCP: ipsilateral lower limb and trunk; coordination of movements of lower limb muscles; posture maintenance
Cuneocerebellar: ipsilateral upper limb and neck; movement of head and upper limb |
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Describe a Brown-Sequard Syndrome |
Causes: Trauma, Degenerative disease (disk herniation, cervical spondylosis), Ischemia, Spinal cord tumor, Infectious/inflammation, Multiple sclerosis, Hemorrhage, Chiropractic manipulation Loss of vibration, discriminatory touch, and proprioception on the right side Loss of pain & temperature on the right side ~2-3 segments above the loss of vibration and proprioceptive sense Loss of pain and temp sensation on the left side beginning below the loss of vibration and proprioceptive sense on the right |
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Describe a transverse cord lesion |
Full loss below damage |
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Describe a central cord lesion |
Postraumatic syrinomyelia, spinal cord contusion, Intrinsic spinal cord tumor (ependymoma, astrocytoma, hemangioblastoma)
damage to spinothalamic fibers crossing in the anterior commisure causes bilateral loss of pain and temperature lesions of the cervical cord produce a classic cape distribution with larger lesions, the DCML tract is damaged as well as motor neurons and motor pathways |
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Describe a posterior cord lesion |
Causes - Tumors, multiple sclerosis, Vit B12, Tertiary Syphillis
Lesions of the Posterior Cord cause loss of vibration and position sense below the level of the lesion |
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Describe a anterior cord lesion |
Causes - Trauma, Multiple sclerosis, Anterior Artery Infarct
Damage to the spinothalamic pathway causes loss of pain and temperature sensation below the level of the lesion.
The Dorsal Column Medial Lemniscal Pathway is not affected. |
