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Spinal Cord_Chp 13A

Chp 13 Test Questions

There are _____ pairs of spinal nerves. 31
The deep groove on the ventral surface that extends the length of the spinal cord is the anterior median fissure.
Which spinal nerves comprise the cauda equina? lumbar, sacral and coccygeal
What two grooves extend the length of the spinal cord and partially divide it into right and left halves? anterior median fissure and posterior median sulcus
The fibrous strand or terminal filum that anchors the inferior end of the spinal cord to the coccyx is a continuation of the pia mater.
Space superficial to the meninges in the spinal cord area in which an anesthetic is injected to block pain impulses from the pelvic area. epidural space
Which of the following is NOT one of the four regions into which the spinal cord is divided? coccygeal
the spinal cord is divided into four regions cervical, thoracic, lumbar, and sacral segments
The spinal cord is contiguous superiorally with the medulla oblongata
The nerves that supply the upper limbs enter or exit from this area of the spinal cord. cervical enlargement
The nerves that supply the lower limbs enter or exit from this area of the spinal cord. lumbar enlargement
Which of the following statements about the spinal cord is NOT correct? It extends to the level of lumbar vertebra three in an adult.
The inferior end of the spinal cord is anchored to the coccyx by the filum terminale.
The white matter in each half of the spinal cord is organized into three columns. ventral column, lateral column, dorsal column
The gray matter on either side of the spinal cord is subdivided into anterior, lateral and posterior horns.
The lateral horns of the gray matter in the thoracic region of the spinal cord contain the cell bodies of gray commissure.
Which of the following terms is synonymous with columns as in columns of white matter in the spinal cord? funiculi
Each column in the white matter of the spinal cord consists of one or more tracts.
Ascending and descending tracts of the spinal cord occur in the roots.
Ascending and descending tracts of the white matter are columns
The knee-jerk reflex involves which of the following? sensory and motor neurons
The "knee-jerk" reflex: is a stretch reflex, in which muscles contract in response to a stretching force applied to them. The stretch reflex is unique in that there is no interneuron between the sensory and motor neurons.
It is a spinal reflex; It is a somatic reflex; It helps to maintain an upright posture. Knee-jerk
Which of the following reflexes inhibits skeletal muscle contraction? Golgi tendon reflex
The Golgi tendon reflex prevents contracting muscles from applying excessive tension to tendons, protecting muscles and tendons from damage caused by excessive tension.
John injured the quadriceps muscles in his legs due to increased tension and tearing while horsing around on the football field. What reflex failed to protect the muscles? Golgi tendon reflex
Inhibitory interneurons are involved in which of the following spinal reflexes? stretch reflex
What Golgi tendon organs pass through the dorsal root to the spinal cord and enter the posterior gray matter, where they branch and synapse with inhibitory interneurons? sensory neurons
Excitatory interneurons are involved in which of the following spinal reflexes? withdrawal reflex
What are conducted by sensory neurons through the dorsal root to the spinal cord, where they synapse with excitatory interneurons? Action potentials from painful stimuli
You are walking bare foot and step on a tack with your right foot; This will happen flexor muscles in your right thigh and leg contract to remove your foot; reciprocal innervation inhibits extensor muscles in the same limb; collaterals of interneurons stimulate a crossed extensor reflex
The reflex arc contains a sensory reception, sensory neuron, motor neuron
Which of the following combinations indicates the correct distribution of spinal nerve pairs? 8 cervical - 12 thoracic - 5 lumbar - 5 sacral - 1 coccygeal
A man was in an accident and severed his spinal cord between C6 and C7. What would occur? loss of sensation in the trunk below the shoulders, the lowers limbs and portions of the arms; loss of movement in the lower limbs; damage to the intercostal nerves which would affect breathing because the intercostal muscles would be paralyzed
The anterior branch or ramus of a spinal nerve supplies muscles and skin on the front and sides of the trunk and limbs
Where are fibers of adjacent spinal nerves sorted and recombined so that fibers specific to a body part reach that body part in the same nerve? plexus
"plexus" means? The term plexus means "braid" and describes the organization produced by the intermingling of the nerves.
The brachial plexus supplies nerves that function to contract which of the following? muscles of the arm and forearm
The brachial plexus contains the axillary nerve which innervates the deltoid and teres minor muscles as well as the skin of the shoulder region;
the radial nerve innervates the posterior arm
the musculocutaneous nerve innervates the anterior arm
the ulnar nerve innervates forearm muscles
the median nerve innervates hand muscles and most arm flexor muscles.
The sciatic nerves arise from which of these plexuses? cervical
Which of the following combinations of spinal nerves supply the brachial plexuses? C5-T1
What are the following peripheral nerves associated with the brachial plexuses? axillary nerves, radial nerves, ulnar nerves
Which of the following nerves arising from the lumbosacral plexuses are the largest and longest peripheral nerves in the body? sciatic nerves
the following plexuses pairs with a peripheral nerve originating from it? brachial - radial nerve; cervical - phrenic nerve; lumbar - femoral nerve
The ventral branches or rami of spinal nerves form nerve plexuses in the following spinal cord areas? cervical, lumbar, and sacral
After severely breaking his left humerus in an accident, a man lost sensation on the posterior aspect of the limb and was unable to extend his forearm, wrist, or fingers. What nerve was damaged? radial
After severely injuring her hip in an accident, a woman was unable to extend her right leg. What nerve was damaged? femoral
The ventral rami of adjacent spinal nerves intermingle with each other to form a plexus
Which of the following nerves arises from the brachial plexus and innervates all of the extensor muscles of the upper limb? radial nerve
Compression of what nerve arising from the brachial plexus results in numbness, tingling, and pain in the fingers, a condition called carpal tunnel syndrome. median nerve
Which of the nerves arising from the lumbosacral plexus is the largest peripheral nerve in the body? ischiadic nerve
Nerve fibers in the phrenic nerves that innervate the diaphragm arise primarily from what plexuses? cervical
Which pair of spinal nerves does NOT supply any skin area? C1
Created by: sweetlatrece



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