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Lecture 1

ANAT 100 Lecture Notes - Lecture 1: Facial Nerve Paralysis, Facial Nerve, Facial Canal


Department
Anatomy and Cell Biology
Course Code
ANAT 100
Professor
Leslie W Mac Kenzie
Lecture
1

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Eaba Degefa (10138769) ANAT 100
1
Case Study
1. Explain in a paragraph format how each of these symptoms would have been manifested.
The symptoms the patient is suffering from could have manifested in numerous ways. The cranial nerve
VII, involves the motor portion which is the facial nerve and the sensory portion which includes taste. In
this case study, it is evident that the male student cannot control his left side of his face and that his taste
sensation is affected therefore there has been some type of injury to the cranial nerve VII. However, there
are no other significant deficits to the cranial nerve which means that the student is not suffering from injury
of the central brain. Also, through the examination of these unilateral symptoms no other nerve is affected.
Furthermore, the case presents the patient suffered influenza-like symptoms, which reveals that the patient
may have damaged the cranial nerves by continuous exposure to cold or a viral infection. Other symptoms
could include stiffness and numbness to the face without objective sensory deficit and a swollen nerve in
the facial canal.i
2. What is the most likely diagnosis? Provide a rationale as to how you came to that conclusion.
When considering the symptoms of being unable to move the left side of the face, wrinkle forehead on
the left side, show teeth or pucker lips on the left side and the taste sensation being affected- the most
probable diagnosis is Bell’s Palsy (Peripheral facial paralysis). This diagnosis is supported by the Human
Anatomy textbook as it describes Bell’s Palsy as the paralysis of the facial muscles leading to decreased
tearing and decreased salivation and loss of taste sensation to anterior two-thirds of tongue. Since the
paralysis is completely unilateral (the left side of the face) it is more probably that this is a CN VII
paralysis.ii CN VII paralysis occurs when the nerve becomes inflamed and compressed causing the muscles
on the same side of the face to become paralyzed. Due to the fact Bell’s Palsy (CN VII paralysis) causes
loss of function of the brachial efferent fiber of the facial nerve and visceral efferent and afferent fibers the
facial nerves that stimulate two of the three pairs of salivary glands in your mouth get damaged and less
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