What is innervated by the facial nerve?
The facial nerve provides motor innervation of facial muscles that are responsible for facial expression, parasympathetic innervation of the glands of the oral cavity and the lacrimal gland, and sensory innervation of the anterior two-thirds of the tongue.
What muscles does cranial nerve 2 innervate?
Cranial nerve 2 is a special somatic afferent nerve which innervates the retina of the eye and brings visual information to the brain. Neural fibers originate from the photoreceptors of the retina. They converge at the optic disc, forming the optic nerve. The optic nerve leaves the orbit through the optic canal.
What are the 2 main nerves supplies to the face?
The sensory innervation to the face comes from the trigeminal nerve which is the only cranial nerve that arises directly from the pons. Its three branches are the Ophthalmic (V1), Maxillary (V2) and Mandibular (V3). Each of those branches supplies the corresponding region on the face.
What are the Innervations of the cranial nerves?
Cranial nerves III, IV, VI, and XII (oculomotor, trochlear, abducens, and hypoglossal nerves) innervate skeletal muscles of the head. For example, nerve fibers of cranial nerves III, IV, and VI innervate muscles of the orbit. Nerve fibers of cranial nerves XII innervate the tongue.
Which skeletal muscles are innervated by the facial nerve?
The superficial muscles are orbicularis oculi, orbicularis oris, zygomaticus major, zygomaticus minor, levator labii superioris, risorius, and depressor anguli oris. All of these muscles are innervated on their deep surface by branches of the facial nerve (VII).
What is the cranial nerve II?
The optic nerve is the second cranial nerve (CN II) responsible for transmitting visual information. The optic nerve contains only afferent (sensory) fibers, and like all cranial nerves is paired.
Where are cranial nerves 1 and 2 located?
For example, the olfactory nerves (I) and optic nerves (II) arise from the base of the forebrain, and the other nerves, III to XII, arise from the brainstem. Cranial nerves have paths within and outside the skull.
Which muscles is innervated by CN VII?
The principal muscles are the frontalis, orbicularis oculi, buccinator, orbicularis oris, platysma, the posterior belly of the digastric, and the stapedius muscle.
What are the five branches of facial nerve and cite their innervated structures?
The five terminal branches of the facial nerve–the temporal, zygomatic, buccal, marginal mandibular, and cervical branches–are closely anatomically related to the parotid gland: they emerge from the parotid gland’s upper, anterior, and lower borders.
What does the trigeminal nerve innervate?
It innervates the muscles of mastication: medial pterygoid, lateral pterygoid, masseter and temporalis.
What is the function of cranial nerve 2?
The optic nerve is the second cranial nerve (CN II) responsible for transmitting visual information.
What muscles are innervated by facial nerve?
– Extraocular muscles innervated by CN III are superior rectus (SR) infecrior rectus (IR) medial rectus (MR) inferior oblique (IO) – Levator palpebrae superioris – Ciliary muscle – Sphincter pupillae
Does the facial nerve innervate the skin of the face?
There are close functional and anatomical relationships between cranial nerves V and VII in both their sensory and motor divisions. Sensation on the face is innervated by the trigeminal nerves (V) as are the muscles of mastication, but the muscles of facial expression are innervated mainly by the facial nerve (VII) as is the sensation of taste.
What is the function of facial nerves?
The main function of the facial nerve is motor control of all of the muscles of facial expression. It also innervates the posterior belly of the digastric muscle, the stylohyoid muscle, and the stapedius muscle of the middle ear. All of these muscles are striated muscles of branchiomeric origin developing from the 2nd pharyngeal arch.
What are symptoms of facial nerve damage?
facial paralysis on one side (rarely are both sides of the face affected)