11/22/2023 0 Comments Skeleton head draw![]() ![]() The first motor branch arises within the facial canal the nerve to stapedius. All these muscles are derivatives of the second pharyngeal arch. These branches are responsible for innervating the muscles of facial expression.īranches of the facial nerve are responsible for innervating many of the muscles of the head and neck. Within the parotid gland, the nerve terminates by splitting into five branches: ![]() ![]() The main trunk of the nerve, now termed the motor root of the facial nerve, continues anteriorly and inferiorly into the parotid gland (note – the facial nerve does not contribute towards the innervation of the parotid gland, which is innervated by the glossopharyngeal nerve). Immediately distal to this, motor branches are sent to the posterior belly of the digastric muscle and to the stylohyoid muscle. It provides motor innervation to the some of the muscles around the ear. The first extracranial branch to arise is the posterior auricular nerve. ExtracranialĪfter exiting the skull, the facial nerve turns superiorly to run just anterior to the outer ear. The facial nerve then exits the facial canal (and the cranium) via the stylomastoid foramen. This is an exit located just posterior to the styloid process of the temporal bone.įig 2 – Schematic of the course and branches of the facial nerve. Chorda tympani – special sensory fibres to the anterior 2/3 tongue and parasympathetic fibres to the submandibular and sublingual glands. ![]()
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