What is 4th nerve palsy?
What is 4th nerve palsy?
Fourth nerve palsy means that a certain muscle in your eye is paralyzed. It is caused by disease or injury to the fourth cranial nerve. In children, it is most often present at birth (congenital). In adults, it is most often caused by injury. Many cases of fourth nerve palsy are idiopathic.
Where does cranial nerve 4 exit the brain?
The trochlear nerve pair originates from a pair of symmetrical trochlear nuclei within the medial midbrain at the level of the inferior colliculus. The left and right nerves then travel dorsally surrounded by the periaqueductal gray matter, decussating before their exit in the dorsal midbrain.
What is the function of cranial nerve 5?
The trigeminal nerve is the fifth cranial nerve (CN V). Its primary function is to provide sensory and motor innervation to the face.
What does cranial nerve 4 palsy look like?
Fourth cranial nerve palsy may affect one or both eyes. Because the superior oblique muscle is paretic, the eyes do not adduct normally. Patients see double images, one above and slightly to the side of the other; thus, going down stairs, which requires looking down and inward, is difficult.
Can a stroke cause 4th nerve palsy?
Brainstem stroke represents a rare cause of trochlear nerve palsy [3], in which infarcts may be extensive or restricted to the microvascular territory [4, 5].
Which is the nerve show by 4?
| Trochlear nerve | |
|---|---|
| The trochlear nerve (CN IV) seen with other cranial nerves. It is the only cranial nerve to emerge from behind the brainstem, and curves around it to reach the front | |
| Details | |
| Innervates | Superior oblique muscle |
| Identifiers |
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.
