Select the answer describing the best function of the anatomical structure indicated by the blue arrow indicated below.
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Options:
explanation: The image shows a prosection of the basal view of the brain, with the brainstem in the centre, the cerebellum posterior to it and the inferior temporal poles to the sides. The cranial nerve providing afferent fibres from the cochlea is the vestibulocochlear nerve (CN VIII), which is located inferolaterally to the structure indicated by the arrow – the trigeminal nerve (CN V), the thickest of the cranial nerves, whose apparent origin is on the anterolateral surface of the pons.
name: Provides afferent fibres from the cochlea
label: c
answer: no
explanation: The image shows a prosection of the basal view of the brain, with the brainstem in the centre, the cerebellum posterior to it and the inferior temporal poles to the sides. The cranial nerve providing efferent fibres for the muscles of facial expression is the facial nerve (CN VII), which is located inferolaterally to the structure indicated by the arrow – the trigeminal nerve (CN V), the thickest of the cranial nerves, whose apparent origin is on the anterolateral surface of the pons.
name: Provides efferent fibres for the facial expression muscles
label: d
answer: no
explanation: The image shows a prosection of the basal view of the brain, with the brainstem in the centre, the cerebellum posterior to it and the inferior temporal poles to the sides. The blue arrow points to the trigeminal nerve (CN V), the thickest of the cranial nerves, whose apparent origin is on the anterolateral surface of the pons. The sensory fibres of the trigeminal nerve innervate the cornea of the eye, forming the afferent limb of the corneal reflex. The efferent limb of the reflex is formed by the facial nerve (CN VII), whose action is to close the eyelids upon corneal stimulation.
name: Provides fibres for the afferent limb of the corneal reflex
label: a
answer: yes
explanation: The image shows a prosection of the basal view of the brain, with the brainstem in the centre, the cerebellum posterior to it and the inferior temporal poles to the sides. The blue arrow points to the trigeminal nerve (CN V), the thickest of the cranial nerves, whose apparent origin is on the anterolateral surface of the pons. The sensory fibres of the trigeminal nerve innervate the cornea of the eye, forming the afferent limb of the corneal reflex. The efferent limb of the reflex is formed by the facial nerve (CN VII), whose action is to close the eyelids upon corneal stimulation.
name: Provides fibres for the efferent limb of the corneal reflex
label: b
answer: no
explanation: The image shows a prosection of the basal view of the brain, with the brainstem in the centre, the cerebellum posterior to it and the inferior temporal poles to the sides. The cranial nerves providing parasympathetic fibres implicated in the salivation reflex are the facial (CN VII) and the glossopharyngeal (CN IX) nerves, which are located inferior to the structure indicated by the arrow – the trigeminal nerve (CN V), the thickest of the cranial nerves, whose apparent origin is on the anterolateral surface of the pons.
name: Provides parasympathetic fibres for the salivation reflex
label: e
answer: no

Correct answer: a