| alpha motor neuron antagonistic muscles anterior horn anterior median fissure arachnoid mater ascend autonomic motor neuron axon cauda equina central canal cerebrospinal fluid cervical cervical enlargement coccygeal coccyx column commissure conus medullaris cross section crossed extensor reflex dendrite denticulate ligament dermatomal distribution descend dorsal ganglion |
dorsal root dura mater effector organ endoneurium epidural space epineurium excitatory interneuron extensor fasciculus filum terminale flexor foramen magnum free nerve ending functional unit funiculus Golgi tendon reflex gray commissure gray matter homeostatic inhibitory interneuron intercostal nerve interneuron involuntary L2 vertebra lateral horn |
lower limbs lumbar lumbar enlargement meninx motor neuron motor unit muscle spindle myelinated axon neuron cell body pain sensors perineurium peripheral nerve pia mater plexus posterior horn posterior median sulcus ramus receptor reciprocal innervation reflex response root rootlet sacral |
sensor input sensory neuron sensory receptor serous fluid somatic motor neuron spinal cord spinal nerve stimulation stimulus stretch reflex subarachnoid space subdural space synapse tendon thoracic tract unconscious upper limbs ventral root ventricle vertebral canal white commissure white matter withdrawal reflex |