PSY 507 Lecture Notes - Lecture 3: Facial Motor Nucleus, Oculomotor Nerve, Trigeminal Nerve
8 Jun 2022
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Alters sensory orifices of face and changes visible features. Facial muscles anchored to skin, unlike other skeletal muscles. Minimal facial hair, noticeable eyebrows and lips. Control of facial movement is distributed and complex than control of other skeletal muscles in body. Voluntary and spontaneous facial expressions have slightly different origins in brain. Facial motor nucleus (7) in brainstem receives input from both: Subcortical areas associated with affect and reflex, such as the amygdala, brainstem and hypothalamus. How the brain sends motor signals to the face. Facial motor nucleus in brainstem sends motor output via facial nerve (vii), which controls most muscles involved in expression. Oculomotor nerve (iii) controls lifting of eyelid, pupil dilation, and movements of eyeball. Trigeminal nerve (v) muscles of jaw, also sends sensory information back from face. How the face sends sensory signals to the brain. Unlike most skeletal muscles, facial muscles seem to lack proprioceptors, which normally tell brain about positioning of muscles in space.
