Midbrain & Pons Flashcards
(23 cards)
Imaginary line from inferior pontine sulcus to the fastigium
Widest diameter of the 4th ventricle
Pontomedullary junction
Tectum in pons
Superior medullary velum
All nuclei are found the pons tegmentum except
Pontine nuclei (located in the pons basis)
Single bundle of transversely coursing pontocerebellar fibes
Middle Cerebellar Peduncle or Brachium Pontis
Connects spinal cord and medulla to cerebellum
Inferior Cerebellar Peduncle
Primarily efferent from the cerebellum to the midbrain and thalamus
Superior Cerebellar Peduncle
Caudal limit of pons dorsally
Stria medullaris of the fourth ventricle
Rostral limit of pons dorsally
Exiting of trochlear nerve
Separates pons basis and tegmentum
Trapezoid bodies
Terminates at pontine nuclei
Sends pontocerebellar fibers to cerebellum
Corticopontine tract
Decussation of corticospinal tract
Lower 1/3 of medulla
Auditory relay nucleus
Superior olives
Principal ascending auditory pathway
Lateral lemniscus
Prominent bulge overlying the abducens nucleus and genu of facial nerve
Facial colliculus
Major source of norepinephrine in CNS
Locus cereleus
Unconscious proprioception of the face
Jaw jerk reflex
Mesencephalic nucleus of CN V
Unconscious proprioception in upper limbs
Dorsal nucleus of Clarke
Function of Abducens nucleus (most medial)
Moves eye laterally
True or false
Cochlear nerve conveys auditory information from only ONE ear
True
It is the lateral lemniscus that conveys from BOTH ears
Lesion in cochlear nerve
Complete ipsilateral deafness
Lesion in lateral lemniscus
Bilateral deafness more on contralateral but partial
Parts of brainstem involved in pain modulation
Nucleus Raphe Magnus
Locus Ceruleus
Periaqueductal Gray
Most ventral of the midbrain tegmentum
Substantia Nigra
