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Medulla Oblongata & Pons

Terms in this set (134)

Demarcation of ventral & dorsal pons by a convex line curving dorsally in front of the medial leminiscus
1)4th Ventricle
2)Ventral Pons
-->Contains most of the descending motor tracts (cortic0spinal & corticobulbar tracts)
3)Dorsal Pons or Tegmentum of the Pons
-->Carries most ascending sensory tracts
4)Depresion in the midline for basilar artery
-->compression of the basilar artery can lead to symptoms associated with damage to the corticospinal tracts bilaterally, known as Central Pontine Myelinolysis
5)Dorsal Tegmentum of the Pons
-->Contains 4 Main Sensory Tracts:
a)Medial Leminiscus
b)Spino-Thalamic Tract
c)Spinal Tract of the Trigeminal
d)Trapezoid Body
-->Ventral end contains medial leminisus in the midline BILATERALLY (ML has moved more anteriorly & apart from each other)
6)Medial Leminiscus
7)Trapezoid Body
-->Contains CROSSED AUDITORY FIBERS in the dorsal tegmentum of the pons
-->The decussation of the auditory fibers for HEARING for the cochlear nucleus (below this point they are ipsilateral)
-->After decussation it ascends upward the inferior colliculus & medial geniculate body
8)Facial Nucleus (located in lateral tegementum of the pons)
-->Fibers from it winds around the abducent nuclues medially to laterally before it exiting the pons (Creates a bump on the way known as the FACIAL COLLICULUS)
9)Abducen Nerve Nucleus (located in lateral tegementum of the pons)
10)Continuation of other tracts from previous lower sections
-->Spinal Nucleus & Tract of the trigeminal
-->Spinothalamic Tract
-->Corticospinal Tract
11)Vestibular Nuclei
-->Continuation from the rostral medulla b/c it is located in the ponto-medullary junction
12)Inferior Cerebellar Peduncle