Accommodation Quiz

Which part of the nervous system controls accommodation of the lens?

• Sympathetic nervous system

• Parasympathetic nervous system

• Central nervous system

• Enteric nervous system

Which muscle is responsible for the accommodation of the lens?

• Ciliary muscle

• Sphincter pupillae

• Dilator pupillae

• Extraocular muscles

What happens to the lens when the ciliary muscle contracts?

• The lens becomes thinner

• The lens becomes thicker

• The lens becomes flatter

• The lens doesn’t change shape

Which autonomic nervous system division controls the pupillary sphincter muscle?

• Sympathetic

• Parasympathetic

• Somatic

• Enteric

Stimulation of the parasympathetic nervous system causes which of the following effects on the pupil?

• Dilation

• Constriction

• No change

• Fluctuation in size

The dilator pupillae muscle is controlled by which autonomic division?

• Sympathetic

• Parasympathetic

• Enteric

• None of the above

Which neurotransmitter is primarily involved in parasympathetic control of accommodation?

• Acetylcholine

• Norepinephrine

• Dopamine

• Serotonin

Sympathetic stimulation causes which of the following effects on the pupil?

• Constriction

• Dilation

• No effect

• Irregular movement

Which receptor type is involved in the sympathetic dilation of the pupil?

• Beta-2 receptors

• Alpha-1 receptors

• Muscarinic receptors

• Nicotinic receptors

Parasympathetic innervation to the eye primarily involves which cranial nerve?

• Optic nerve (CNII)

• Oculomotor nerve (CNIII)

• Trochlear nerve (CNIV)

• Abducens nerve (CNVI)