1. Important marks Pyramids underlying – pyramidal (corticospinal tract) Decussation of pyramids— Olive– within inferior olivary nucleus Gracile tubercle- fasciculus gracilis and nucleus Cuneate tubercle – fasciculus cuneatus and nucleus cuneatus Convex of pon – transverse pontine fiber --- pontocerebellar fibers – middle
Development of spinal cord
InternBiblioteka l structures in spinal cord
Asecending tracts: Fasciculus gracilis & cuneatus Spinothalamic Descending tracts: Corticospinal tract Intersegmental tract Fasciculus proprius Central canal
Sulucus limitans
Components of Cranial Nerves
Sulucus limitans
General Visceral Afferent Special Visceral Afferent
Internal structures in brain stem
Central canal –expend to form Ⅳventricle 7 nulei column: Somatic sensory Somatic motor General visceral motor General visceral sensory Special visceral sensory Special somatic sensory Special visceral motor
cerebellar peduncle Facial colliculus –abducens nucleus and fibers of facial nerve 2. CN III ~ XII attachment to brain stem
Development of spinal cord & brain stem
sensory nuclei of CN
General somatic sensory nuclei Trigeminal nuclei : Chief sensory Mesencephlic Spinal
Special somatic sensory nuclei
Vestibular nuclei from midpons to rostral medulla just lie beneath the vestibular area.
Ⅲ, Ⅳ, Ⅵ, Ⅻ cranial nerve nuclei near the median plane.
Special visceral motor nuclei
Trigeminal motor nuclei Facial nuclei Accessory spinal nuclei Ambiguus nuclei
Internal structures of brain stem
Dept. of Anatomy Zhou Hong Ying
grey matter white matter reticular formation
Review the external structures of brain stem
Nuclei CN connected to cranial nerves
Grey matter
Nuclei CN connected to cranial nerves
relay nuclei of ascending & descending tract ( NON cranial nuclei )- Nucleus of ascending and descending tract at different level of the brain stem
Cochlear nuclei between the pons and medulla just lie beneath the lateral recess of rhomboid fossa.
White matter
ascending & descending tracts Fibers take part in reflex
Grey matter : Cranial nerve nuclei
somatic motor nuclei
Oculomotor nuclei Trochlear nuclei Abducens nuclei Hypoglossal nuclei
General visceral motor nuclei
Accessory oculomotor nuclei Superior & inferior salivatory nuclei Dorsal motor vagus nuclei
sensory nuclei of CN
General & special visceral sensory nuclei ----Solitary nucleus
three nulei column Anterior,posterior,and lateral or intermediolateral horn
Motor Column 1. GSE 2. SVE 3. GVE
Sensory Column 4. GVA 5. SVA 6. GSA 7. SSA