It is the only cranial nerve that exits from the dorsal (rear) aspect of the brainstem. It innervates a muscle, the superior oblique muscle, on the opposite side (contralateral) from its nucleus. The trochlear nerve decussates within the brainstem before emerging on the contralateral side of the brainstem (at the level of the inferior colliculus).

2024年11月1日 · Fourth nerve palsy (trochlear nerve palsy) causes double vision and makes it difficult to look down. Some cases are present from birth (congenital) and others happen due to damage to your trochlear nerve (acquired).

2023年7月15日 · The trochlear nerve is the fourth cranial nerve (CN IV) and one of the ocular motor nerves that controls eye movement. The trochlear nerve, while the smallest of the cranial nerves, has the longest intracranial course as it is the …

There are several clinically significant features of the trochlear nerve anatomy. It is the thinnest, and longest cranial nerve. Additionally, the fourth cranial nerve exits dorsally, crosses the midline, and innervates the contralateral SOM.

What is the trochlear nerve? Your trochlear nerve, also known as the cranial nerve 4 or CN IV, is a motor (movement) nerve that sends signals from your brain to one of the muscles that control eye movement. You have two trochlear nerves — one for …

2023年10月30日 · Course of the oculomotor, trochlear and abducens nerves. Synonyms: Cranial nerve IV, CN IV , show more... The trochlear nerve is the fourth paired cranial nerve (CN IV). Along with the oculomotor nerve (CN III) and the abducens nerve (CN VI), it is responsible for controlling movement of the eyeball.

2024年9月8日 · Trochlear nerve palsy is a frequently seen condition in ophthalmology clinics. In most cases, it may be congenital or post-traumatic but can occasionally manifest a more sinister underlying disease and require timely intervention.

2024年12月23日 · The trochlear nerve is the fourth (CN IV) and thinnest cranial nerve. It exits the midbrain posteriorly, eventually passes into the cavernous sinus and into the orbit where it supplies superior oblique muscle with motor fibers (TA: nervus trochlearis or nervus cranialis IV).

2025年2月10日 · In this article, we shall look at the anatomy of the trochear nerve – its course, motor functions and clinical relevance. Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way.

Origin: Body of the sphenoid bone medial to the common tendinous ring. Damage to the trochlear nerve can be caused by either congenital or acquired causes. To compensate and reduce the...