Reflex arc

reflex arc represents the simplest type of neural pathway found in the nervous system

• True

• False

1. sensory neuron leads

2. contact one or more interneurons

3. communicate with motor (efferent) neurons

4. axons (nerve fibers) lead outward to effectors

• True

• False

an automatic, subconscious response

• reflex

• stretch reflex

• withdrawal reflexes

involves a single synapse (monosynaptic) between a sensory and a motor neuron within the gray matter of the spinal cord

• reflex

• stretch reflex

• withdrawal reflexes

interneurons in combination with sensory and motor neurons; thus, they are polysynaptic

• reflex

• stretch reflex

• withdrawal reflexes

The stretched muscle responds by contracting to resist or reverse further stretching. These stretch reflexes are important to maintaining proper

• posture

• balance

• movements

• hearing

-The reflex involves the femoral nerve and the spinal cord

- moderate extension of the leg at the knee joint

• Patellar (knee-jerk) reflex

• Calcaneal (ankle-jerk) reflex

• Biceps (biceps-jerk) reflex

• Triceps (triceps-jerk) reflex

• Plantar reflex

-The reflex involves the tibial nerve and the spinal cord

-feet slightly dorsiflexed over the edge and relaxed.

-Gently strike the calcaneal tendon

• Patellar (knee-jerk) reflex

• Calcaneal (ankle-jerk) reflex

• Biceps (biceps-jerk) reflex

• Triceps (triceps-jerk) reflex

• Plantar reflex

- bare arm bent about 90° at the elbow on the table

-over the tendon of the biceps brachii

-The reflex involves the musculocutaneous nerve and the spinal cord.

• Patellar (knee-jerk) reflex

• Calcaneal (ankle-jerk) reflex

• Biceps (biceps-jerk) reflex

• Triceps (triceps-jerk) reflex

• Plantar reflex

- The reflex involves the radial nerve and the spinal cord

• Patellar (knee-jerk) reflex

• Calcaneal (ankle-jerk) reflex

• Biceps (biceps-jerk) reflex

• Triceps (triceps-jerk) reflex

• Plantar reflex