Where does the branching of the facial nerve (CN VII) take place?
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The facial nerve (CN VII) is a complex nerve that supplies motor, sensory, and parasympathetic functions to the face and scalp. The facial nerve originates in the pons of the brainstem and exits the skull base through the stylomastoid foramen. At this point, it is divided into five main branches that supply different regions of the face including:
1. Temporal branch: This branch supplies the frontalis muscle and orbicularis oculi muscle, which helps to close the eyes tightly.
2. Zygomatic branch: This branch supplies the orbicularis oculi muscle, which helps to close the eyes and elevate the upper lip.
3. Buccal branch: This branch innervates the buccinator muscle, which helps in compressing the cheeks during chewing and speaking.
4. Marginal mandibular branch: This branch supplies the muscles responsible for lowering the lower lip, such as the depressor labii inferioris muscle.
5. Cervical branch: This branch supplies the platysma muscle, which helps to pull down the lower lip and angle of the mouth.
Thus, the branching of the facial nerve (CN VII) takes place after it exits the skull base through the stylomastoid foramen.
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