Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134320762
Author: Frederic H. Martini, Robert B. Tallitsch, Judi L. Nath
Publisher: PEARSON
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Chapter 15, Problem 13RFT
Summary Introduction
Introduction:
The corticospinal tracts are composed of the motor neurons, which includes the anterior corticospinal, lateral corticospinal, and corticobulbar tracts. They are also referred to as the pyramidal tracts. They form the descending tracts and control motor movements of the lower and upper limbs in the body.
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Chapter 15 Solutions
Human Anatomy (9th Edition)
Ch. 15 - Match each numbered item with the most closely...Ch. 15 - Prob. 2RFTCh. 15 - Match each numbered item with the most closely...Ch. 15 - Prob. 4RFTCh. 15 - Prob. 5RFTCh. 15 - Match each numbered item with the most closely...Ch. 15 - Prob. 7RFTCh. 15 - Prob. 8RFTCh. 15 - Match each numbered item with the most closely...Ch. 15 - Prob. 10RFT
Ch. 15 - Prob. 11RFTCh. 15 - Which of the following are spinal tracts within...Ch. 15 - Prob. 13RFTCh. 15 - 14. Give the anatomical names of the spinal tracts...Ch. 15 - Prob. 1RCCh. 15 - Prob. 2RCCh. 15 - Why do the proportions of the sensory homunculus...Ch. 15 - Prob. 4RCCh. 15 - 5. Compare the actions directed by motor commands...Ch. 15 - Prob. 1CTCh. 15 - As a result of a snowboarding accident, John is...
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- Spinal nerves are called mixed nerves because they, (a) are associated with a pair of spinal ganglia. (b) exit at intervertebral foramina. (c) contain sensory and motor fibers. (d) are associated with a pair of dorsal and ventral roots.arrow_forwardTed is a war veteran who was hit in the back with small pieces of shrapnel. His skin is numb in the center of his buttocks and along the entire posterior side of a lower limb, but there is no motor problem. Indicate which of the following choices is the most likely site of his nerve injury, and explain your choice: (a) a few dorsal roots of the cauda equina, (b) spinal cord transection at C6, (c) spinal cord transection at L5, (d) femoral nerve transected in the lumbar region.arrow_forwardA ganglion is a collection of (a) neuron cell bodies, (b) axons of motor neurons, (c) interneuron cell bodies, (d) axons of sensory neurons.arrow_forward
- Central pattern generators (CPGs) are found at the segmental level of motor control. (a) What is the job of the CPGs? (b) What controls them, and where is this control localized?arrow_forwardCell bodies of UMN that synapse on LMN lie in all of these areas EXCEPT a) Medulla b) Thalamus c) Pre-motor cortex Pons d) Primary motor cortexarrow_forwardSpinal nerves are called mixed nerves because they (a) are associated with a pair of dorsal root ganglia. (b) exit at intervertebral foramina. (c) contain sensory and motor fibers. (d) are associated with a pair of dorsal and ventral roots.arrow_forward
- Match the names of the cells in column B with the function they perform, shown in column A.Column A Column B(1) line the central cavity of the brain (a) astrocytes(2) form myelin in the CNS (b) ependymal cells(3) form myelin in the PNS (c) microglial cells(4) remove neurotransmitters in the CNS (d) oligodendrocytes(5) regulate ionic composition of thefluid around neurons in the CNS (e) satellite cells (f) Schwann cells(6) CNS phagocytesarrow_forwardSketch the spinal cord in cross section, and label the following structures: (a) lateral funiculus of white matter, (b) ventral root, (c) ventral horn of gray matter, (d) central canal, (e) dorsal root ganglion, (f) dorsal column tracts: fasciculus gracilis and fasciculus cuneatus, (g) ventral corticospinal tract, (h) lateral corticospinal tract.arrow_forwardFor each of the following muscles or body regions, identify the plexus and the peripheral nerve (or branch of one) involved. Use one choice from Key A followed by one choice from Key B. Key A: Plexuses Key B: Nerves(a) brachial (1) common fibular (6) phrenic(b) cervical (2) femoral (7) radial(c) lumbar (3) median (8) tibial(d) sacral (4) musculocutaneous (9) ulnar (5) obturatorStructure Innervated__,__ (1) the diaphragm__,__(2) muscles of the posterior compartments of thigh and leg__,__(3) anterior compartment thigh muscles__,__(4) medial compartment thigh muscles__,__(5) anterior arm muscles that flex the forearm__,__(6) muscles that…arrow_forward
- Fill in the blanks below: Sensory neurons carrying information into the spinal cord synapse at the .................. horn. Motor commands exiting the spinal cord are generated in the............... horn. The interneurons that process sensory information and determine the appropriate motor output are found in the.................... matter of the spinal cord. The myelinated axons of the neurons carrying information to and from the brain are found in the .............. matter.arrow_forwardWhich of the following is NOT true in adults? (A) The tapering end of the spinal cord may terminate as high as T12 or as low as L3. (B) The first cervical nerves lack dorsal roots in 50% of people. (C) The coccygeal nerve may be absent. (D) The terminal filum is the vestigial rem- nant of the caudal part of the spinal cord that was in the tail of the embryo. (E) The spinal cord has a lumbar enlargement for the lower limb but no equivalent enlargement for the smaller upper limb.arrow_forward1) Motor information exits the spinal cord through the: a) anterior column. b) posterior column. c) anterior horn. d) posterior horn.arrow_forward
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