Cranial nerve nuclei and their CN
Cranial nerve nuclei and their CN
relay nuclei of ascending & descending tract ( NON cranial nuclei )
•Nucleus Gracilis & Nucleus Cuneatus •Inferior olivary nucleus •Pontine nucleus •Superior & inferior collicus nuclei •Red nucleus •Substantia nigra
Development of spinal cord & brain stem
Development of spinal cord & brain stem
Asecending tracts: Fasciculus gracilis & cuneatus Spinothalamic Descending tracts: Corticospinal tract Intersegmental tract ❖ Fasciculus proprius Central canal
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
❖ contains important reflex centers associated with the control of respiration and the cardiovascular system and with the control of consciousness
❖ contains the important nuclei of cranial nerves III through XII
sensory nuclei of CN
General & special visceral sensory nuclei ----Solitary nucleus
sensory nuclei of CN
General somatic sensory nuclei ❖ Trigeminal nuclei : Chief sensory ❖ Mesencephlic ❖ Spinal
Internal structures of brain stem
Dept. of Anatomy Zhou Hong Ying
grey matter white matter reticular formation
Functions of brainቤተ መጻሕፍቲ ባይዱstem
❖ conduit for the ascending tracts and descending tracts connecting the spinal cord to the different parts of the higher centers in the forebrain
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
Grey matter : Cranial nerve nuclei
somatic motor nuclei
❖ Oculomotor nuclei ❖ Trochlear nuclei ❖ Abducens nuclei ❖ Hypoglossal nuclei
Ⅲ, Ⅳ, Ⅵ, Ⅻ cranial nerve nuclei near the median plane.
Special somatic sensory nuclei
Vestibular nuclei from midpons to rostral medulla just lie beneath the vestibular area.
Cochlear nuclei between the pons and medulla just lie beneath the lateral recess of rhomboid fossa.
Special visceral motor nuclei
❖ Trigeminal motor nuclei ❖ Facial nuclei ❖ Accessory spinal nuclei ❖ Ambiguus nuclei
General visceral motor nuclei
❖ Accessory oculomotor nuclei ❖ Superior & inferior salivatory nuclei ❖ Dorsal motor vagus nuclei
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