| A | B |
|---|
| A nerve fiber consists of the ____ of a single neuron. | axon |
| The ___________ is the conective tissue covering that surrounds a fascicle. | perineurium |
| The _________ wraps several fascicles together to form a nerve. | epineurium |
| The peripheral nervous system consists of nerves and ________ . | ganglia |
| The _____ nerve is a unique cranial nerve in that it regulates most of the major viscera and not just structures of the head and neck. | Vagus |
| There are __ pair of spinal nerves. | 31 |
| The _______ rami repeatedly branch and anastamose to form nerve plexuses. | ventral |
| The phrenic nerve arises from the ________ plexus. | cervical |
| The sciatic nerve arises from the ______ plexus. | sacral |
| The ____________ division of the autonomic nervous system is also called the thoracolumbar division because the presynaptic neurons originate in the lateral horn of the spinal cord. | sympathetic |
| A ______ _______ is a sense organ that monitors the length of a skeletal muscle and is stimulated by muscle relaxation. | muscle spindle |
| ____ __________ is the term used to describe a phenomenon in the sympathetic nervous system where one preganglionic neuron can excite multiple postganglionic neurons and therefore affect multiple organ systems in the body at once. | Mass activation |
| The _______ _______ is called a modified sympathetic ganglion because it secretes neurotransmitters (catecholamines) into the blood in response to stimulation from preganglionic sympathetic fibers. | adrenal medulla |
| Most parasympathetic fibers reach their target organ by way of the ________ nerve. | vagus (X) |
| __________ fibers secrete norepinephrine and are usually postganglionic sympathetic fibers. | Adrenergic |
| __________ receptors are found on all glands, smooth muscles, and cardiac muscles that receive cholinergic innervation. | Muscarinic |
| __________ receptors function by means of a second messenger. | Adrenergic |
| Name the two major divisions of the efferent nervous system | Somatic system; Autonomic System |
| Name 4 properties of a reflex. | Require stimulation; Quick; Involuntary; Predictable |
| Name the two types of adrenergic receptors and identify which is excitatory and which is inhibitory. | Alpha - excitatory; Beta - usually inhibitory |
