Spinal Cord and the Somatic Motor System-Lecture 13 Exam 3 Flashcards

1
Q

Divisions/Segments of the Spinal Cord

A

-Cervical (C1 – C8)
-Thoracic (T1 – T12)
-Lumbar (L1 – L5)
-Sacral (S1 – S5)

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2
Q

Cross-Sectional Spinal Cord Anatomy

A

White Matter & Gray Matter

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3
Q

Dorsal/Posterior Horn

A

-Somatic sensory (afferent) neurons travel through the spinal nerve then through the dorsal/posterior root & synapse in the dorsal horn
-Carry sensory information from the body to the spinal cord

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4
Q

Dorsal/Posterior Root Ganglia

A

Contains sensory neuron cell bodies

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5
Q

Ventral/Anterior Horn

A

-Contains somatic motor neuron cell bodies
-Somatic motor (efferent) axons travel through the ventral root then
through the spinal nerve to skeletal muscles
-Transmit voluntary motor information from spinal cord to skeletal muscles

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6
Q

Dorsal Root

A

Above & diagonal of ventral root

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7
Q

Ventral Root

A

Below & diagonal of dorsal root

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8
Q

Spinal Nerve

A

Where dorsal root and ventral root come close to contact heading towards somatic neurons

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9
Q

Lateral Corticospinal Tract (descending)

A

Voluntary motor control of skeletal muscles

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10
Q

Lateral Spinothalamic Tract (ascending)

A

Sensory info about pain & temperature

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11
Q

Ventral Spinothalamic Tract (ascending)

A

Sensory info about touch

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12
Q

White Matter (outer portion)

A

Myelinated axons (fiber tracts)

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13
Q

Gray Matter (inner portion)

A

-Neuron cell bodies, unmyelinated axons, axon terminals
-Dorsal (posterior) horn: sensory neuron axon terminals
-Ventral (anterior) horn: motor neuron cell bodies
-Lateral horn: (between T1 and L2) ANS cell bodies

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14
Q

Components of Neuromuscular Junction

A

-Somatic Motor Neuron
-Synaptic Cleft
-Skeletal Muscle Fiber

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15
Q

Somatic Motor Neuron

A

-Presynaptic axon terminal with ACh-filled vesicles
-Cell body originates in the ventral horn of the spinal cord
-Synapses directly onto skeletal muscle (target) & releases ACh
-Axon branches at its terminal end to innervate more than one skeletal
muscle fiber

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16
Q

Skeletal Muscle Fiber

A

Postsynaptic membrane (motor end plate) with nicotinic receptors

17
Q

Synaptic Cleft

A

The gap between neurons that allows chemical signals to pass between them