The facial VII nerve

This nerve has various functions:

• It innervates the muscles of facial expression.

• It is the efferent limb of the corneal reflex (see p. 2(H) and also the palmomental rellex (a contraction of the ipsilateral menlalis muscle in response to scratching the thenar eminence), the pout or snout reflex (a bilateral pursing of the lips following a brisk tap on the lips), the nasopalpebral reflex (glabellar tap) and the efferent limb of the stapedius rellex.

• Through the nervus intermedins (sensory and parasympathetic fibres) it supplies parasympathetic secreto-motor fibres to the lacrimal gland (producing tears) and submandibular gland (producing saliva).

• It supplies taste sensation to the anterior two-thirds of the tongue through the chorda tympani branch.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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