Nervus trochlearis er den fjerde hjernenerve.
| Større nerver (se også Det perifere nervesystemet) |
| | Hjernenerver: I olfactorius | II opticus | III oculomotorius | IV trochlearis | V trigeminus | V1 ophthalmicus (lacrimalis, frontalis, supratrochlearis, supraorbitalis, nasociliaris, ganglion ciliare) | V2 maxillaris (ganglion sphenopalatina) | V3 mandibularis (buccalis - auriculotemporalis - lingualis - inferior alveolar - ganglion otica) | VI abducens | VII facialis (chorda tympani, nervus intermedius) | VIII vestibulocochlearis (cochlearis, vestibularis) | IX glossopharyngeus | X vagus (recurrent laryngeal, Alderman's nervus) | XI accessorius | XII hypoglossus Posterior spinal nervus: greater occipital C1-C4 - plexus cervicalis: lesser occipital | greater auricular | lesser auricular | phrenic | ansa cervicalis C5-C8, T1 - Plexus brachialis: supraclavicular branches (dorsal scapular, suprascapular, thoracic longus) | lateral cord (musculocutaneous, lateral antibrachial cutaneous, lateral head of median nervus) | medial cord (ulnaris, medial head of median nervus, medial antibrachial cutaneous, medial brachial cutaneous) | posterior cord (axillaris, radialis) T2-T11: intercostal T12, L1-L5 - Plexus lumbalis: iliohypogastric | ilioinguinal | genitofemoral | lateral femoral cutaneous | femoral | obturator S1-S4 - Plexus sacralis: gluteal | posterior femoral cutaneous | tibial | ischiatica | sural | peroneus communis S2-S5 - Plexus pudendalis: perforating cutaneous | pudendal | visceral | muscular | anococcygeal |
