Cranial nerve, seventh
Cranial nerve, seventh: The seventh cranial nerve is the facial nerve, a mixed nerve that has fibers both going out and coming in (both efferent and afferent fibers). It supplies the muscles of facial expression.
Paralysis of the facial nerve causes a characteristic picture with drooping of one side of the face, inability to wrinkle the forehead, inability to whistle, inability to close the eye and deviation of the mouth toward the other side of the face. Paralysis of the facial nerve is called Bell’s palsy.
- Cranial nerve, tenth
Cranial nerve, tenth: The tenth cranial nerve, and one of the most important, is the vagus nerve. All twelve of the cranial nerves, the vagus nerve included, emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column. The vagus nerve originates in the medulla oblongata, […]
- Cranial nerve, sixth
Cranial nerve, sixth: The sixth cranial nerve is the abducens nerve. It is a small motor nerve that has one task: to supply a muscle called the lateral rectus muscle that moves the eye outward. Paralysis of the abducens nerve causes inward turning of the eye (internal strabismus) leading to double vision. The cranial nerves, […]
- Cranial nerve, third
Cranial nerve, third: The third cranial nerve is the oculomotor nerve. The cranial nerves emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column. There are twelve cranial nerves. The oculomotor nerve is responsible for the nerve supply to muscles about the eye: The upper […]
- Cranial nerves
Cranial nerves: The nerves of the brain, which emerge from or enter the skull (the cranium), as opposed to the spinal nerves, which emerge from the vertebral column. There are 12 cranial nerves, each of which is accorded a Roman numeral and a name: Cranial nerve I: the olfactory nerve Cranial nerve II: the optic […]
Cranio-: Referring to the cranium, the top portion of the skull, the bony vault that protects the brain. As in craniocleidodysostosis, craniology, craniopharyngioma, craniotomy, etc.