Quiz 8 A&P

Most neurons in the brain are

multipolar

Which nerve from the brachial plexus innervates the extensor muscles of the arm and forearm?

radius

Which of the following is the most sensitive body region?

Face

Diffusion across which structure(s) returns excess CSF to venous circulation?

arachnoid granulations

Interneurons

are found only in the CNS

Regions of the brain that are involved in interpreting data or coordinating motor responses are

association areas

Which structure functions in the subconscious control of muscle tone and the coordination of learned movement patterns?

basal nuclei

The phrenic nerves arise from the

cervical plexus

Branches that sometimes occur along the length of an axon are called

collaterals

Postganglionic fibers of autonomic neurons are usually

connected to cardiac muscle, smooth muscle, glands, and adipocytes

Which of the following is a descending pathway of the spinal cord?

corticospinal

Which pathway begins at the pyramidal cells of the cerebral cortex?

corticospinal

Voluntary control of skeletal muscles is provided by the

corticospinal pathway.

In adults, the spinal cord usually extends to which level?

first or second lumbar vertebra

If the dorsal root of a spinal nerve is severed,

incoming sensory information would be disrupted.

The processing of olfactory sensations and reflex movements associated with eating occurs in the

mammillary bodies

Compound nerve trunks containing axons derived from several spinal nerves originate from

plexuses.

Spinal nerves from the brachial plexus innervate the

shoulder girdle and upper limb

The corticospinal tracts function in the control of

skeletal muscles

Which of the following contains a delicate network of collagen and elastin fibers through which cerebrospinal fluid circulates?

subarachnoid space

An autonomic motor neuron whose cell body lies in the CNS is called a(n)

preganglionic neuron.

Which nerve innervates the diaphragm?

Phrenic

The spinal pathway(s) that carries/carry information regulating skeletal muscle tone is/are the

medial and lateral pathways

Which pathway provides subconscious, involuntary control of muscle tone and movements of the neck, trunk, and limbs?

medial pathway

The brachial plexus nerve that controls the flexor muscles of the arm and forearm, and the skin on the lateral surface of the forearm, is the ________ nerve.

musculocutaneous

Damage to the ________ nerve, which is vital for the autonomic control of visceral function, could result in death.

vagus

Which of the following is the correct order of events that occur at a cholinergic synapse? 1. Extracellular calcium enters the axon terminal, triggering the exocytosis of acetylcholine. 2. Acetylcholine is removed by acetylcholinesterase. 3. Acetylcholine binds to receptors and depolarizes the postsynaptic membrane. 4. Axon terminal depolarizes.

4,1,3,2

The cranial nerves whose primary function is special sensory are

I, II, and VIII.

Which cranial nerve is responsible for the motor innervation of pharyngeal muscles and parotid salivary glands?

IX

Which structure(s) control(s) the reflex movements of the eyes, head, and neck in response to visual stimuli?

Superior colliculus

Motor innervation of the muscles of facial expression is transmitted through which cranial nerve?

VII

Which cranial nerve is responsible for the sensory innervation of the anterior two-thirds of the tongue?

VII

The largest and most numerous of the glial cells in the central nervous system are the

astrocytes

Stimulation of the reticular formation results in

increased attention

The flexor reflex

is a withdrawal reflex.

During continuous conduction,

local currents depolarize adjacent areas of membrane so that action potentials continue to form along the membrane.

Most neurons lack centrioles. This observation explains

why such neurons cannot divide through mitosis.