Spinal+reflex+arc+6

Spinal Reflex

 The spinal cord sends and receives information to and from the brain. It is continuous with the brain stem.

3 Types of neurons: 1) Afferent-  sensory nerves carry information from the body to the brain.  2) Efferent-  motor nerves carry information from the brain to the body. 3) Interneurons-  carry information between 2 neurons.  Grey Matter  - butterfly shaped center portion of the spinal cord that carries cell bodies.   Dorsal Ganglion - Location of the afferent neuron's cell body.   Ventral Nerve Root -  the region from the spinal cord to the spinal nerve containing motor fibers.   Dorsal Nerve Root  - the region from the spinal cord to the posterior spinal cord containing sensory fibers. <span style="font-family: 'Times New Roman',Times,serif; font-size: 18.6667px;">Receptor <span style="font-family: 'Times New Roman',Times,serif;"> - nerve ending that monitors changes in the external environment. <span style="font-family: 'Times New Roman',Times,serif; font-size: 18.6667px;">Effector <span style="font-family: 'Times New Roman',Times,serif;"> - tissue supplied by a motor neuron. <span style="font-family: 'Times New Roman',Times,serif; font-size: 18.6667px;">Spinal Nerve <span style="font-family: 'Times New Roman',Times,serif;"> - sensory information travels up the afferent fiber and directly stimulates the efferent neuron in the anterior grey horn of the spinal cord. <span style="font-family: 'Times New Roman',Times,serif; font-size: 18.6667px;"> Efferent fibers then send signals to a muscle to move the body.