This is just here as a test because I lose it

Term information

database cross reference

uberon_slim, pheno_slim, vertebrate_core

latin term
nervus trochlearis [IV] [ FMA:TA FMA:50865 ]

4n [ BIRNLEX:1654 NIFSTD:NeuroNames_abbrevSource ]


A cranial nerve that runs to the eye muscles.

depicted by


development notes

The human trochlear nerve is derived from the basal plate of the embryonic midbrain.

external definition

Somatic efferent nerve which supplies a single eye muscle, the m. obliquus superior.[AAO]

has exact synonym

fourth cranial nerve

cranial nerve IV

superior oblique nerve

trochlear IV nerve

trochlear nerve [IV]

trochlear nerve tree

nervus trochlearis [IV]

has related synonym

pathetic nerve


trochlear nerve or its root


nervus trochlearis

trochlear nerve/root

nerve IV

homology notes

We conclude this section by listing some of the many synapomorphies of craniates, including (...) (5) cranial nerves (...) (reference 1); Phylogenetically, the cranial nerves are thought to have evolved from dorsal and ventral nerves of a few anterior spinal nerves that became incorporated into the braincase. Dorsal and ventral nerves fuse in the trunk but not in the head, and they produce two series: dorsal cranial nerves (V, VII, IX, and X) and ventral cranial nerves (III, IV, VI, and XIII) (reference 2).[well established][VHOG]



taxon notes

Homologous trochlear nerves are found in all jawed vertebrates