What is the 7th cranial nerve CN VII?
The facial nerve is the seventh cranial nerve (CN VII). 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.
Where is the nucleus of cranial nerve 7?
Structure. The nucleus is situated in the caudal portion of the ventrolateral pontine tegmentum. Its axons take an unusual course, traveling dorsally and looping around the abducens nucleus, then traveling ventrally to exit the ventral pons medial to the spinal trigeminal nucleus.
What are the branches of CN VII?
Within the parotid gland, the facial nerve divides into five branches:
- Marginal mandibular.
What is the function of nerve 7?
VII. The facial nerve provides both sensory and motor functions, including: moving muscles used for facial expressions as well as some muscles in your jaw. providing a sense of taste for most of your tongue. supplying glands in your head or neck area, such as salivary glands and tear-producing glands.
What cranial nerves are sensory only?
Cranial nerves I, II, and VIII are pure sensory nerves. Cranial nerves III, IV, VI, XI, and XII are pure motor nerves. Cranial nerves V, VII, IX, and X are mixed sensory and motor nerves. The olfactory nerve (CN I) contains special sensory neurons concerned with smell.
What does oculomotor nerve do?
The oculomotor nerve is the third cranial nerve (CN III). It allows movement of the eye muscles, constriction of the pupil, focusing the eyes and the position of the upper eyelid. Cranial nerve III works with other cranial nerves to control eye movements and support sensory functioning.
Is a nuclei a nucleus?
Nucleus (plural nuclei) is a Latin word for the seed inside a fruit. It most often refers to: Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell’s DNA.
What nerve does CN VII innervate?
Parasympathetic Innervation: CN VII provides preganglionic parasympathetic innervation to: Submandibular glands. Sublingual glands It is important to note that all of the postganglionic parasympathetic nerve fibers from CN VII are actually carried to their ultimate targets via divisions of CN V.
What does the cranial nerve VII do?
* This field is for validation purposes and should be left unchanged. Cranial nerve VII is the facial nerve. It supplies motor, sensory and parasympathetic innervation to various structures of the head and neck.
How does the nucleus compare to a classroom?
Our analogy of the nucleus compares the principal of school to the nucleus. The nuclues controls the cell activites just as the principal controls the school activities. The ER is where all the work gets completed. Our analogy that we thought would work was a classroom because they both are where the work gets down.
How does the ventral aspect of the facial nucleus work?
The ventral aspect of the facial nucleus receives mainly contralateral inputs. As a result, the left hemisphere partially controls the upper left and right side of the face partially and fully the lower right side of the face.