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MEDULLA, CAUDAL LEVEL

Nucleus gracilis (sensory lower limbs)Nucleus cuneatus (sensory upper limbs)

Internal arcuate fibers (from gracilis & cuneatus)

Spinal nucleus of V (pain & temp face)

Decussation of the Pyramids

Hypoglossal nucleus (motor to tongue)

Spinothalamic tract & Descending Hypothalamic fibers

387

MEDULLA, OPEN LEVELInferior olive to cerebellum

Spinal nucleus of V P & T face

Solitary nucleus visceral fibers CNs VII, IX and X

Nucleus ambiguus motor CNs IX & X (pharynx, larynx, soft palate)

Dorsal motor nucleus visceral motor neurons to cardiac & smooth muscles: thorax, GI to splenic flexure.

Hypoglossal nucleus tongue

Medial lemniscus

Spinothalamic tract & descending hypothalamic fibers

Pyramids (corticospinal tract)387

PONS AT CNS VI & VII

Corticospinal tract

Medial lemniscus beginning to move laterally

Spinal nucleus of V

Abducens nucleus

Facial nucleus

Facial nerve

Spinothalamic & descending hypothalamic fibers

Medial longitudinal fasciculus386

PONS AT THE LEVEL OF CN VMotor nucleus of V muscles of mastication

Main sensory nucleus (V) touch from face

Medial lemniscus

Corticospinal tract

Spinothalamic tract & descending hypothalamic fibers

Medial longitudinal fasciculus axons to CN III

386

MIDBRAIN AT CN IV

Cerebral aqueduct

Corticospinal tract

Medial Lemniscus

Spinothalamic tract & descending hypothalamic fibers

Inferior colliculus auditory nucleus

Trochlear nucleus- innervates superior oblique

Medial longitudinal fasciculus ascending axons to CN III385

385MIDBRAIN AT CN IIICerebral aqueduct

Corticospinal tractCorticobulbar fibers

Medial Lemniscus

Spinothalamic tract & descending hypothalamic fibers

Superior colliculus visual reflexes

Oculomotor nucleus - innervates most eye muscles

Medial longitudinal fasciculus