HMB200H1 Lecture Notes - Cerebellum, Diencephalon, Limbic System
Document Summary
Lumbar (5), sacral (5) coccygeal (1). (review p. 227: cranial nerves i-xii (review p. 233). Parasympathetic optic nerve (pupil), vagus (visceral), 7/8/9 (salivation) Descending pathways: all important for keeping eyes, head, neck in, reticulospinal startle, vestibulospinal startle; balance, posture (alignment, stops from falling, due to head acceleration) Rs & vs: hindbrain pathways, ventrally located; travels in ventral column ventral horn: tectospinal mainly crossed pathway from superior colliculus neck (head, eye neck movements for turning) Cell bodies in mid layer of s. colliculus, crosses under pag (where defense mechs located) Pons horizontal eye movements: midbrain vertical eye movements, rubrospinal tegmental spinal (largest) more ventral, limb movement from cortex, body movement, corticospinal fine movements in hands, see pp. Descending tracts to spinal cord nucleus/midbrain+thal, reticular formation. [dozens of nuclei in brainstem core where monoamine transmitters have cell bodies; dif f"ns]: midbrain nuclei (colliculi dorsal/tectum, Periaqueductal gray, red n. , substantia nigra black dopamine neurons then white gaba neurons below): diencephalon (pituitary gland, hypothalamus,
