S6: Internal and External Anatomy of the Pons Flashcards
1
Q
A
Middle Cerebellar Peduncles
2
Q
A
CN 5
3
Q
A
CN 6
4
Q
A
CN 7
5
Q
A
Superior Cerebellar Peduncles
6
Q
A
basis of the pons
7
Q
16
A
facial colliculus
8
Q
A
vestibular area
9
Q
A
pontine tegmentum
10
Q
A
Abduscens nuclei
supplied by: perforating branches of basilar
11
Q
A
Facial Nerve
supplied by anterior inferior cerebral a.
12
Q
A
medial lemniscus
supplied by mostly branches from the basilar
13
Q
A
lateral lemniscus
14
Q
A
Superior olive
supplied by AICA ?
15
Q
A
Vestibular nulcei
supplied by AICA
16
Q
A
Medial longitudinal fascilus
supplied by perforating basilar a.
17
Q
A
Paramedian Pontine Reticular formation
18
Q
A
Rubrospinal tract
19
Q
A
ALS
supplied by AICA
20
Q
A
Spinal n. of trigem.
supplied by AICA
21
Q
A
Spinal tract of trigem.
supplied by aica
22
Q
A
inferior cerebellar peduncle
23
Q
A
superior cerebellar peduncle
24
Q
A
corticospinal tract
supplied by perforating branches of basilar
25
middle cerebellar peduncle
26
medial lemniscus
27
rubrospinal tract
28
ALS
29
Motor nucleus of trigem
supplied by AICA
function: somatosensory for head and neck and motor jaw muscles
pathology: numbness in head and neck on SAME SIDE
weakened chewing
sensory loss elsiminating corneal reflexing -\> irritated cornea
30
principal sensory of trigem.
function: epicritic from head and neck
pathology: reduced 2 point tactile, fibration, position sense on SAME SIDE of head
31
CN 5: Trigem
function: somatosensory for head and neck, motor for jaw
pathology: numbness in head and neck on the same side, weakened chewing, sensory loss eliminates corneal reflex resulting in irritated cornea
32
lateral lemniscus
function: hearing
pathology: no obvious pathology (from unilateral X)
33
Superior olive
function: hearing, particularly in locating the source of sound
pathology:
unilateral - nothing, due to bilaterality of auditory pathway
34
**Decussation of the trapezoid body**
function: 1. somatosensory for trunk and limbs (medial lemniscus)
2. autditory: crossing lateral lemniscus fibers
pathology:
1. loss of epicritic sense for trunk and limbs
2. no obvious hearing loss
35
Locus Ceruleus
function: main source of Norepeinphrine, motor control and sleep; adjusts muscle tone during rem
Pathology: prevents collapse of tone during REM (in cats...), implicated in parinksonism
36
Medial longitduinal fasiculus
function: coordinates head and eye position
pathology: itnernuclear opthalmoplegia; contralateral eye cannot adduct for conjugate gaze shift but can adduct during convergence
37
pontine nuclei
38
Medial longitudinal fasciculus
function: coordinates head and eye position
pathology: contralateral eye cannot adduct for conjugate gaze shift, can adduct during convergence
39
locus ceruleus
function: main source of norepeinhrpine; motor control and sleep; adjusts muscle tone during REM
pathology: implicated in parinksoniasm, prevents collapse of tone during REM sleep
40
**superior cerebellar peduncle**
pathology: cerebellar signs: ataxia, intention tremor
connections: o carries most of cerebellums output to other parts of the brain
• main ouput:
areas of pontine reticular formation
red nucleus in the midbrain
ventral anterior and ventral alteral nucleus in the thalamus -\> precentral gyrus and premotor cortex
41
**medial lemniscus**
function: epicritic somatosensory for trunks and limbs on OPPOSITE SIDE
pathology: loss of 2 point, vibration, position sense, asterogonosis, shuffling gait etc.
42
crus cerebri
function:
cortical control of movement and some descending gating of sensory signals
pathology: 1. loss of indepdent finger movement
2. slowed rxn times
3. slight weakness
43
**lateral lemniscus**
function: hearing
pathology: no obvious sx from unilateral X
44
Corticospinal tract
function: motor contorl from cortex to motor neurons of CN and ventral horn
isolated pathology: loss of indepdent finger control, slowed rxn times
45
facial nculeus
46
superior cerebellar peduncle
47
dentate nucleus
48
inferior cerebellar peduncle
49
middle cerebellar peduncle
50
