W5 - Cranial Nerves and the Bst Flashcards
How many of the 12 cranial nerves associate with the Bst?
11 (not olfactory, emerges from the forebrain)
Which four cranial nerves emerge from the midbrain (and higher)?
Olfactory, optic, oculomotor, trochlear
Which four cranial nerves emerge from the pons?
Trigeminal, abducens, facial, vestibulocochlear
Which four cranial nerves emerge from the medulla?
Glossopharyngeal, vagus, spinal accessory and hypoglossal
Which 3 nerves are pure sensory?
Olfactory, optic and vestibulocochlear
Which 5 nerves are pure motor?
Oculomotor, trochlear, abducens, spinal accessory and hypoglossal
Which 4 nerves are mixed?
Trigeminal, facial, glossopharyngeal and vagus
What is the main function of the olfactory nerve (S)?
Smell
What is the main function of the optic nerve (S)?
Vision
What is the main function of the oculomotor nerve (M)?
Elevation and adduction of the eye
What is the main function of the trochlear nerve (M)?
Depression and adduction of the eye
What is the main function of the trigeminal nerve (S+M)?
Sensory - Facial sensations - touch, pain, proprioception
Motor - mastication (chewing)
What is the main function of the abducens nerve (M)?
Motor - Abduction of the eye
What is the main function of the facial nerve (S+M)?
Motor - Facial expression
Sensory - nasal secretion + lacrimation and taste
What is the main function of the vestibulocochlear nerve (S)?
Sensory - hearing and balance
What is the main function of the glossopharyngeal nerve (S+M)?
Sensory - taste, salivation
Motor - innervates pharynx
What is the main function of the vagus nerve (S+M)?
Motor - larynx/pharynx (voicebox) Sensory - para reflexes (e.g. coughing), Autonomic - innervates heart/lungs/GI tract
What is the main function of the spinal accessory nerve (M)?
Motor - innervates the muscles of the head and neck
What is the main function of the hypoglossal nerve (M)?
Motor - Innervation of the tongue
The sympathetic innervation doesn’t come from the Bst like the para innervation, where does it come from?
Symp neurons of the SC
Which 2 areas are associated with dopamine?
Nigra substantia area and the ventral tegmental area
Which area is associated with serotonin?
The raphe nuclei
Which area is associated with noradrenaline?
Locus coeruleus of pons
