Meninges - Connective Tissue Membranes Quiz
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Questions and Answers

What is the function of the sensory division?

  • Conducts impulses from CNS to effectors
  • Informs the CNS of the state of the body interior and exterior
  • Conveys information to the CNS from sensory receptors
  • Conducts impulses from receptors to the CNS (correct)

Which type of nerve fibers can be somatic according to the text?

  • Motor nerve fibers
  • Sensory nerve fibers (correct)
  • Autonomic nerve fibers
  • Visceral nerve fibers

What is the function of the autonomic nervous system?

  • Conducts impulses from CNS to effectors
  • Informs the CNS of the state of the body interior and exterior
  • Conveys information to the CNS from sensory receptors
  • Conducts impulses from the CNS to smooth muscle, cardiac muscle, and glands (correct)

Which neurons convey information to the CNS from autonomic sensory receptors?

<p>Sensory neurons (B)</p> Signup and view all the answers

What type of motor neurons conduct impulses from the CNS to skeletal muscles?

<p>Somatic motor neurons (C)</p> Signup and view all the answers

Where are autonomic sensory receptors primarily located?

<p>In the thorax and abdomen (B)</p> Signup and view all the answers

Which layer of the meninges is a thin transparent connective tissue layer that adheres to the surface of the spinal cord and brain?

<p>Pia mater (C)</p> Signup and view all the answers

Where are anesthetics typically injected in the vertebral canal?

<p>Epidural space (B)</p> Signup and view all the answers

Which layer of the meninges is a thin web arrangement of delicate collagen and some elastic fibers?

<p>Arachnoid mater (B)</p> Signup and view all the answers

What anchors the closed caudal end of the dura mater to the coccyx?

<p>Filum terminale (D)</p> Signup and view all the answers

In which space is serous fluid found between the dura mater and the wall of the vertebral canal?

<p>Subdural space (C)</p> Signup and view all the answers

Where is the supracristal line located for lumbar puncture?

<p>L3-L4 (D)</p> Signup and view all the answers

Which nucleus in the spinal cord receives visceral pain?

<p>Intermedio-medial nucleus (B)</p> Signup and view all the answers

Where do 1st order neuron axons terminate in the spinal cord?

<p>Nucleus dorsalis (B)</p> Signup and view all the answers

Which tract ascends to the medulla oblongata and pons?

<p>Anterior spinocerebellar tract in contralateral white column (B)</p> Signup and view all the answers

Which descending tract is responsible for subconscious regulation of balance and muscle tone?

<p>Vestibulospinal tracts (C)</p> Signup and view all the answers

Where do the fibers that crossed over in the spinal cord cross back within the cerebellum?

<p>Cerebellar cortex (D)</p> Signup and view all the answers

What type of neurons are responsible for conscious control of skeletal muscles?

<p>Upper motor neurons (D)</p> Signup and view all the answers

What is the function of the Vestibulospinal tract?

<p>Facilitate the activity of extensor muscles (C)</p> Signup and view all the answers

Which type of reticulospinal tract is tonically active under normal conditions?

<p>Medullary reticulospinal tracts (D)</p> Signup and view all the answers

Where do the axons of RF neurons from the Medullary reticulospinal tracts descend into the spinal cord?

<p>Lateral white column (A)</p> Signup and view all the answers

Which motor system synapses with alpha and gamma through interneurons?

<p>Pontine reticulospinal tract (D)</p> Signup and view all the answers

What is the main function of the Pontine reticulospinal tract?

<p>Activate axial and proximal limb extensors (B)</p> Signup and view all the answers

Which tract is NOT tonically active under normal conditions?

<p>Lateral reticulospinal tract (LRST) (B)</p> Signup and view all the answers

What is the major function of the lateral reticulospinal tract?

<p>Responsible for reflex movement of head &amp; neck in response to visual stimuli (D)</p> Signup and view all the answers

Which motor system is responsible for controlling axial & proximal muscles?

<p>Medial Motor system (A)</p> Signup and view all the answers

What characterizes muscles affected by Lower Motor Neuron (LMN) lesions?

<p>Wasting and hypotonia (D)</p> Signup and view all the answers

Where do the majority of fibers from the tectospinal tract terminate?

<p>Anterior gray column of upper cervical segments of spinal cord (D)</p> Signup and view all the answers

What differentiates Upper Motor Neuron (UMN) lesions from Lower Motor Neuron (LMN) lesions regarding muscle tone?

<p>Hypertonia in UMN lesions and hypotonia in LMN lesions (C)</p> Signup and view all the answers

Which tract is predominantly responsible for controlling distal muscles?

<p>Lateral corticospinal tract (A)</p> Signup and view all the answers

What is the main function of the nervous system described in the text?

<p>Controlling muscle and gland activation (B)</p> Signup and view all the answers

Which type of cells do not divide in the nervous tissue according to the text?

<p>Motor neurons (D)</p> Signup and view all the answers

What is the primary function of receptors in the nervous system described in the text?

<p>Monitor stimuli (A)</p> Signup and view all the answers

Which type of cells support, nourish, and protect neurons in the nervous tissue?

<p>Neuroglia (B)</p> Signup and view all the answers

What is the major function of the autonomic nervous system?

<p>Conduct impulses from the CNS to smooth muscle, cardiac muscle, and glands (D)</p> Signup and view all the answers

What is a distinctive feature of neurons in nervous tissue based on the text?

<p>Highly metabolic activity (D)</p> Signup and view all the answers

Where are autonomic sensory receptors primarily located?

<p>In the visceral organs (C)</p> Signup and view all the answers

Which characteristic is true about neuroglia in the nervous tissue according to the text?

<p>Do not outnumber neurons significantly (A)</p> Signup and view all the answers

What characterizes muscles affected by Lower Motor Neuron (LMN) lesions?

<p>Decreased muscle tone and flaccid paralysis (A)</p> Signup and view all the answers

Which part of the brainstem receives afferent fibers from the cerebral cortex and cerebellum for the Rubrospinal tract?

<p>Red nucleus (C)</p> Signup and view all the answers

Which type of nerve fibers can be somatic according to the text?

<p>Sensory nerve fibers (D)</p> Signup and view all the answers

What is the primary function of the Rubrospinal tract?

<p>Facilitate the activity of flexors (A)</p> Signup and view all the answers

Which type of input is NOT described for the corticobulbar fibers in the brainstem?

<p>Unilateral input (B)</p> Signup and view all the answers

Which descending tract is responsible for subconscious regulation of balance and muscle tone?

<p>Vestibulospinal tract (A)</p> Signup and view all the answers

Where do Extrapyramidal tracts arise from in the nervous system?

<p>Brainstem (B)</p> Signup and view all the answers

Where do the majority of fibers from the tectospinal tract terminate?

<p>Spinal cord (C)</p> Signup and view all the answers

Which muscle group are the Rubrospinal tracts primarily involved in regulating?

<p>Axial muscles (D)</p> Signup and view all the answers

What is characteristic of the Subconscious Motor Tracts?

<p>Multisynaptic pathways (C)</p> Signup and view all the answers

Which motor system is responsible for controlling distal muscles?

<p>Lateral Motor system (A)</p> Signup and view all the answers

In which part of the spinal cord do the majority of fibers from the tectospinal tract terminate?

<p>Anterior gray column of upper cervical segments (D)</p> Signup and view all the answers

What characterizes muscles affected by Upper Motor Neuron (UMN) lesions regarding tone?

<p>Hypertonia (B)</p> Signup and view all the answers

Where does the lateral reticulospinal tract originate from?

<p>Red nucleus in the midbrain (C)</p> Signup and view all the answers

What characterizes muscles affected by Lower Motor Neuron (LMN) lesions regarding power?

<p>Individual muscles are paralyzed (A)</p> Signup and view all the answers

What is a common characteristic of muscles affected by Lower Motor Neuron (LMN) lesions?

<p>Wasting of affected muscles (atrophy) (A)</p> Signup and view all the answers

A patient with loss of muscle joint sense, position sense, vibration sense, and tactile discrimination on the same side below the level of the lesion may have a lesion affecting which sensory tract?

<p>Fasciculus cuneatus (C)</p> Signup and view all the answers

Which artery reinforces the arterial supply to the lower portion of the spinal cord?

<p>Artery of Adamkiewicz (B)</p> Signup and view all the answers

A lesion affecting sacral sparing in an intramedullary tumor can lead to which sensory loss?

<p>Loss of pain and thermal sensation on the contralateral side (A)</p> Signup and view all the answers

Which pair of arteries lie within the subarachnoid space and anastomose on the inferior surface of the brain to form the circle of Willis?

<p>Vertebral artery and internal carotid artery (C)</p> Signup and view all the answers

What is the function of longitudinal arteries in the spinal cord's blood supply?

<p>To supply the anterior spinal artery (D)</p> Signup and view all the answers

Which artery usually arises from the left posterior intercostal artery, supplying the lower two-thirds of the spinal cord?

<p>Artery of Adamkiewicz (C)</p> Signup and view all the answers

What anatomical structure contains neuronal cell bodies, dendrites, unmyelinated axons, axon terminals, and neuroglia?

<p>Gray matter (A)</p> Signup and view all the answers

Which division of the nervous system consists of 31 spinal nerves and 12 cranial nerves?

<p>Peripheral Nervous System (C)</p> Signup and view all the answers

What is the main function of the Epithalamus within the brain?

<p>Regulation of hormone secretion (B)</p> Signup and view all the answers

Which term refers to a cluster of nerve cell bodies in the Central Nervous System that is surrounded by white matter?

<p>Nucleus (C)</p> Signup and view all the answers

Where does a bundle of processes in the Peripheral Nervous System typically terminate?

<p>Nerves (B)</p> Signup and view all the answers

What is the primary function of the brainstem's Subthalamus?

<p>Control of balance and muscle tone (D)</p> Signup and view all the answers

Where do the upper motor neurons of the lateral corticospinal tract originate?

<p>Precentral gyrus (B)</p> Signup and view all the answers

Which part of the spinal cord is responsible for controlling extensors of the vertebral column?

<p>Dorsomedial nuclei (B)</p> Signup and view all the answers

From which area of the cortex do extrapyramidal tracts mainly originate?

<p>Area 6 (A)</p> Signup and view all the answers

Which group of motor neurons is responsible for intercostal and abdominal muscle control?

<p>Dorsomedial nuclei (B)</p> Signup and view all the answers

Where do most fibers of the lateral corticospinal tract decussate to the opposite side?

<p>Medulla oblongata (A)</p> Signup and view all the answers

Which part of the spinal cord surrounds the central canal and contains motor neurons of the anterior horn?

<p>Lamina X (A)</p> Signup and view all the answers

Which motor nuclei receive bilateral input from the corticobulbar fibers according to the text?

<p>Lower facial muscles and genioglossus muscle (C)</p> Signup and view all the answers

What is the function of the Rubrospinal tract according to the information provided?

<p>Facilitate the activity of flexors and inhibit extensors (C)</p> Signup and view all the answers

Which part of the brain houses the Red nucleus involved in the Rubrospinal tract according to the text?

<p>Midbrain (C)</p> Signup and view all the answers

How do Extrapyramidal tracts differ from corticospinal tracts as mentioned in the text?

<p>They are under the influence of the cerebral cortex (A)</p> Signup and view all the answers

Which tracts are considered part of the Subconscious Motor Tracts based on the information provided?

<p>Vestibulospinal tracts and Reticulospinal tracts (D)</p> Signup and view all the answers

What is a notable characteristic of the motor pathways described in the text?

<p>They are multisynaptic (B)</p> Signup and view all the answers

Which region of the spinal cord receives the greatest percentage of fibers from the lateral corticospinal tract?

<p>Cervical (C)</p> Signup and view all the answers

Where do corticoneuclear tract fibers originating in the motor cortex terminate in the brainstem?

<p>Midbrain, Pons, and Medulla (D)</p> Signup and view all the answers

Which layer of the spinal cord is mainly targeted by synapses of the lateral corticospinal tract fibers?

<p>Lamine IV (D)</p> Signup and view all the answers

Where do anterior corticospinal tract fibers act on muscles?

<p>Proximal muscles of upper limb (B)</p> Signup and view all the answers

Which region of the brainstem receives descending fibers from the motor cortex for corticoneuclear tract formation?

<p>Medulla (D)</p> Signup and view all the answers

What percentage of lateral corticospinal tract fibers synapse in lamine IV, V, VI, VII, and VIII?

<p>90% (B)</p> Signup and view all the answers

Which clinical sign is likely to be present in a patient with hypertonia and hyperreflexia?

<p>Clonus (D)</p> Signup and view all the answers

What happens when sudden release is applied to a muscle experiencing the clasp-knife reaction?

<p>Muscle tension decreases (D)</p> Signup and view all the answers

How does an increase in external pressure on the spinal cord affect dermatomes?

<p>First affects cervical dermatomes (D)</p> Signup and view all the answers

What is the result of the overactivity of the pontine excitatory system mentioned in the text?

<p>Spasticity (A)</p> Signup and view all the answers

In response to stimulation of the sole, what reflex takes place when corticospinal tracts are nonfunctional?

<p>Withdrawal reflex with toes fanning out (B)</p> Signup and view all the answers

What is the result of an intramedullary tumor affecting cervical fibers?

<p>Impaired pain and temperature sensation in sacral dermatome (B)</p> Signup and view all the answers

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