CN VII (Facial) Flashcards
CN VII (facial) is a very mixed N with how many nuclei?
4
What are the 4 nuclei?
Motor (motor nucleus in pons) SVE fibers
Ordinary sensation (sensory nucleus of trigeminal N) GSA fibers
Parasympathetic (superior salivary nucleus) GVE fibers
Taste (solitary tract nucleus) SVA fibers
The motor nucleus is located where?
Pons
CN VII leaves brainstem where?
At pontomedullary angle
CN VII enters the skull via what?
Internal Acoustic Meatus located in temporal bone
CN VII leaves the skull via what?
Stylomastoid Foramen located in temporal bone
CN VII carries motor fibers to what muscles of facial expression?
Temporal Zygomatic Buccal Marginal Mandibular Cervical
CN VII innervated what muscle?
Stapedius in middle ear plus muscles of ear and posterior belly of digastric
CN VII conveys what from anterior 2/3 of tongue?
Taste
CN VII conveys taste via what?
Chorda Tympani and Nervus intermedius to nucleus tractus solitarius
The chorda tympani also carries what?
parasympathetic innervation from superior salivary nucleus to submandibular and sublingual salivary glands and lacrimal glands
The chorda tympani carry fibers to submandibular and sublingual glands via
Submandibular glands of CN v3
The chorda tympani carry fibers to lacrimal glands via?
Pterygopalatine ganglion of CN v2
Taste and parasympathetic fibers are carried by what?
Chorda Tympani which connect facial N to lingual branch of CN V3
How is taste sensation distributed in the tongue?
Sweet (tip of tongue CN VII)
Salt and Sour (sides of tongue CN VII)
Bitter (root of tongue CN IX)
The facial N also carries a few general sensory afferent fibers from what
Skin of external ear canal via auricular branch of CN X
The general sensory afferent fibers end where?
Trigeminal sensory nucleus
The fibers end in trigeminal sensory nucleus before crossing over to opposite to synapse in what?
Ventral posterior medial nucleus of thalamus
