Search results
Results From The WOW.Com Content Network
English: Explicative diagram of reflex arc; the journey takes energy and nerve impulse of a stimulus by two or more neurons.The spinal cord(3) receives sensory impulses of the body(2)- here his finger and sent to the central nervous system (afferent pathways(4), which sends impulses to the spinal motor (efferent(5)that sends turn-here the bodies arm muscle through spinal nerves(6).
Reflex arc demonstrated. When a reflex arc in an animal consists of only one sensory neuron and one motor neuron, it is defined as monosynaptic, referring to the presence of a single chemical synapse. In the case of peripheral muscle reflexes (patellar reflex, achilles reflex), brief stimulation to the muscle spindle results in contraction of ...
In a reflex arc, an action potential never travels to the brain for processing and so results in a much quicker reaction. When a stimulus (pain) is encountered, the signal from that stimulus will travel up the sensory neuron to the spinal column.
The term "reflex" was introduced in the 19th century by the English physiologist Marshall Hall, who is credited with formulating the concept of reflex action and explaining it scientifically. He introduced the term to describe involuntary movements triggered by external stimuli, which are mediated by the spinal cord and the nervous system ...
The simplest type of neural circuit is a reflex arc, which begins with a sensory input and ends with a motor output, passing through a sequence of neurons connected in series. [59] This can be shown in the "withdrawal reflex" causing a hand to jerk back after a hot stove is touched.
The following diagram is provided as an overview of and topical guide to the human nervous system: Human nervous system. Human nervous system – the part of the human body that coordinates a person's voluntary and involuntary actions and transmits signals between different parts of the body.
Knee jerk or patellar reflex — a kick caused by striking the patellar tendon with a tendon hammer just below the patella, stimulating the L4 and L3 reflex arcs. Moro reflex , a primitive reflex — only in all infants up to 4 or 5 months of age: a sudden symmetric spreading of the arms, then unspreading and crying, caused by an unexpected ...
The lateral corticospinal tract (also called the crossed pyramidal tract or lateral cerebrospinal fasciculus) is the largest part of the corticospinal tract.It extends throughout the entire length of the spinal cord, and on transverse section appears as an oval area in front of the posterior column and medial to the posterior spinocerebellar tract.