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spinal cord
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Nerves and ganglia of the human spinal cord Human spinal cord Structures of a spinal nerve The Human Body MRI of a patient with syringomyelia lower cervical section of human spinal cord Diagram showing the knee jerk reflex: a reflex hammer strikes the patellar tendon below the knee, activating a stretch receptor in the quadriceps muscle. This sends a signal through a sensory neuron to the spinal cord, where it connects to a motor neuron. The motor neuron then signals the muscle to contract, causing the lower leg to kick forward. The diagram also illustrates the pathway of sensory and motor neurons and their connection in the spinal cord. reflexive action
Understand the structure and functions of the central nervous system
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Superficial arteries and veins of face and scalp, cardiovascular system, human anatomy, (Netter replacement project - SSC)
The Human Body
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Understand the structure and functions of the central nervous system
The brain and the spinal cord constitute the central nervous system.
Video: Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.com

Images

Nerves and ganglia of the human spinal cord
Diagram of the human spinal cord, vertebrae, and sympathetic trunk (shown on one...
Encyclopædia Britannica, Inc.
Human spinal cord
Lower cervical segment of the human spinal cord. In this photograph of a cross section,...
From D.E. Haines, Neuroanatomy: An Atlas of Structures, Sections, and Systems, 4rd ed. (1995), Williams & Wilkins, Baltimore
 Structures of a spinal nerve
Spinal nerves are paired peripheral nerves that arise from the spinal cord.
Encyclopædia Britannica, Inc.
MRI of a patient with syringomyelia
Magnetic resonance image (MRI) of a patient with syringomyelia. An abnormal cavity...
Courtesy of Romeo Ethier
lower cervical section of human spinal cord
Schematic drawing showing the cytoarchitectural lamination of the lower cervical...
Encyclopædia Britannica, Inc.
knee-jerk reflex
Knee-jerk reflex and motor-neuron connection.
Encyclopædia Britannica, Inc.
reflexive action
The mechanism of reflexive action of the nervous system.
Encyclopædia Britannica, Inc.

Interactives

The Human Body
Experience the major systems of the human body.
Encyclopædia Britannica, Inc.
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