C: Accomodation Reflex Flashcards Preview

Year 2 Term 2 C&M > C: Accomodation Reflex > Flashcards

Flashcards in C: Accomodation Reflex Deck (8)
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1
Q

What are the 3 components of the accomodation reflex - which muscle does each?

A

1) Pupils constrict - sphincter pupillae
2) Ocular convergence medial rectus
3) Lens rounding - contraction ciliary muscle

2
Q

Which CN carries the afferent limb of the accomodation reflex and which the efferent?

A
Afferent = CN1
Efferent = CN2
3
Q

In the accommodation reflex is the striate cortex involved?

A

Yes - afferent part ends here and gives rise to interneuron which synpases with first neuron in efferent part of the reflex

4
Q

In the accomodation reflex fibres from the striate cortex synapse where?

A

In the somatic occulomotor nucleus

In the Edinger Westphal (PS) occulomotor nucleus

5
Q

What happens in the somatic occulomotor nucleus in the accomodation reflex?

A

Fibres from striate cortex synapse with fibres which travel to medial rectus via CN3

6
Q

What happens in the Edinger Westphal nucleus in the accomodation reflex?

A

Fibres from the striate cortex synapse with preganglionic PS fibres which travel to ciliary ganglion via CN3

7
Q

Which autonomic ganglion of the head is involved in the accomodation reflex?

A

Ciliary ganglion

8
Q

What is the nerve supply to sphincter pupillae and ciliary muscle in the accomodation reflex?

A

Post ganglionic PS fibres carried from ciliary ganglion