Flashcards in Medulla Oblongata Deck (22):
1
2 Brainstem Structures w/ Corticospinal Fibers
Cerebral peduncle and pyramid
2
2 Structures Bordering Cerebral Aqueduct
Tectum and tegmentum of midbrain above and below, respectively (w/ latter having CN III coming out)
3
1.2 Contents of Tectum of Midbrain
Corpora quadrigemina w/ superior colliculi for vision and inferior colliculi for auditory
4
2 Structures that Connect Brainstem to Cerebellum
Superior and middle cerebellar peduncles
5
Only CN That arises from dorsal side of brain stem
IV
6
11 Structures Through Caudal Medulla
Corticospinal tract/pyramid (cross over and become contralateral)
Spinothalamic Tract (unchanged)
Spinocerebellar tracts (unchanged)
Spinal tract of V (trigeminal)
Fasciculi cuneatus and gracilis, and their nuclei
Medial lemniscus
Nucleus of spinal tract of V
Trigeminothalamic tract
7
Medial Lemniscus
After cuneatus and gracilis synapse at their nuclei, the 2nd order neurons desuccate and continue up contralaterally
8
Trigeminal Path Through Medulla
Brings in sensory information from whole head and neck ipsilaterally, so also IX, X, V, brings in Spinal Tract of V, synapses in nucleus of spinal tract of V, and then desuccates to trigeminothalamic tract just lateral to medial lemniscus and continues up contralaterally
9
Main Desuccation Point
Caudal Medulla
10
Distinct Landmark of Rostral Medulla
Inferior Olive
11
6 Nuclei in Rostral Medulla
Nucleus ambiguous
Spinal nucleus of V
Nucleus solitarius
Vestibular nuclei
Dorsal motor nucleus of X
Hypoglossal nucleus
12
8 Tracts in Rostral Medulla
Corticospinal tract (pyramid) (contra now)
Medial lemniscus
Rubrospinal Tract
Trigeminothalamic tract
Medial longitudinal fasciculus
Nucleus fasciculus
Hypoglossal n. (XII)
13
Nucleus Ambiguous
Controls motor fibers for pharynx, larynx, and palate so CN IX and X have motor cell bodies there
14
Nucleus Solitarius
Sensory taste, so cell bodies for VII, IX, and X
15
Medial longitudinal fasciculus (MLFs)
Integrate 3 eye muscle nuclei w/ muscles in neck so everything aligns
16
3 Actions of Glossopharyngeal (IX)
Sensory from ipsilateral pharynx and taste from posterior 1/3 of tongue
Innervates ipsilateral stylopharyngeus muscle
Innervates parotid gland
17
2 Exits of IX and X
Medulla from postolivary sulcus, skull via jugular foramen
18
Lesion of IX (2)
Loss of gag reflex, parotid secretion
19
4 Nuclei for IX
Inferior salivatory nucleus (in same plane as dorsal motor nucleus of X) for parasymp motor to parotid
Spinal nucleus of V - sensation from pharynx
Nucleus solitarius - taste
Nucleus ambiguous - motor to stylopharyngeus
20
4 Nuclei for Vagus
Dorsal motor nucleus of vagus for parasymp motor to lung and GI
Spinal nucleus of V for sensation from larynx
Nucleus solitarius for sensory from cardiac/resp/GI
Nucleus ambiguous for motor to pharyngeal/laryngeal/cardiac muscle
21
Hypoglossal n. 2 Exits
Medulla in preolivary sulcus and skull through hypoglossal canal
22