CN and Nuclei I and II Flashcards
Which CN’s don’t have discrete nuclei in the brainstem?
CN’s 1 and 2
General breakdown of where CN’s are located in brainstem.
MDB: III and IV
PONS: V, VI, VII, and VIII
MED: ix, X,XI and XII
All sympathetic things done by the motor nucleus are done by…
CN X (Dorsal Motor X aka DMX)
Function of Edinger-Westphal nucleus
GVE for CN III, (pupil small and lens fat)
Function of Oculomotor nucleus
GSE for CN III
Function of Trochlear nucleus
GSE for CN IV
Function of motor nucleus
SVE for CN V (muscles of mastication etc.)
Function of Abducens nucleus
GSE for CN VI
Function of Superior salivatory nucleus
GVE for CN VII (lacrimal, sub-lingual and sub-maxillary)
Function of Facial nucleus
SVE for CN VII (muscles of face exp. etc.)
Function of Inferior salivatory nucleus
GVE for CN IX (parotid)
Function of Hypoglossal nucleus
GSE for CN XII (muscles of the tongue)
Function of Dorsal motor nucleus
GVE for CN X (to thorax and abdomen)
Function of Nucleus ambiguus
SVE for CN X (larynx) and IX (stylopharyngeus)
Function of Spinal accessory nucleus
SVE for CN XI (trapezius and SCM)
Function of Mesencephalic nucleus
GSA, jaw-jerk reflex for CN V
Function of Main sensory nucleus
GSA, for CN V (similar to dorsal column nuclei). Relays position, vibration and 2-point discrimination for THE HEAD.
i.e. position sense for the head.
Function of Cochlear/vestibular n.
SSA for CN VIII
Function of Spinal nucleus
GSA for V (similar to nucleus proprius) Relays pain and temp for head via spinal thalamic tract. Relays pain and temp for ear pinna for CN’s VII, IX and X
Function of Nucleus of Solitary Tract
Only nucleus that has 2 components:
SVA (taste)- VII, IX and X
GVA for VII (palate-deep sensation), IX (palate and carotid sinus), and X (pain and stretch-viscera and aortic baroreceptors)
Basics of the CN I
Include attachment and nucleus of origin or termination.
Run through cribiform plate and enter olfactory bulb. Then synapse near hippocampus.
Attachment: Olfactory bulb
N-of-T: SVA-Olfactory mucosa
Attachment and nucleus of origin or termination for CN II
Att.: Optic chiasma
N-of-T: SSA- Lateral geniculate body
Where does the optic nerve ultimately synapse?
Occipital cortex (BROADMANN’S AREA 17 surrounding the calcarine fissure).
Fibers for vision course back in…
Optic radiations
Attachment and nucleus of origin or termination for CN III
Att.: Sulcus on walls of interpeduncular fossa
N-of-O:
(1) For GVE- Edinger-Westphal
(2) For GSE- Oculomotor nucleus
Attachment and nucleus of origin or termination for CN IV
Att.: Superior medullary velum
N-of-O: GSE-Trochlear nucleus
Special things with the trochlear nerve.
Has the longest intracranial exposure. Only nerve to cross and originate from dorsum of the brainstem.
Attachment and nucleus of origin or termination for CN V.
Att.: Lateral part of the pons
N-of-O and T:
(1) For GSA- Sensory nucleus of nerve V
(2) For SVE- Motor nucleus of nerve V
Attachment and nucleus of origin or termination for CN VI
Att.: Sulcus between pons and medulla on anterior surface
N-of-O:GSE- Abducens nucleus (pons)
Attachment and nucleus of origin or termination for CN VII
Att.: Cerebellomedullary pontine angle
N-of-O or T: ALL PONS
(1) GVA- nuc solitarius
(2) SVA- nuc solitarius
(3) GSA- sensory nuc of N5
(4) GVE- sup. salivatory nuc
(5) SVE- motor nuc of 7
Attachment and nucleus of origin or termination for CN VIII
Att.: Cerebellomedullary pontine angle
N-of-T: Both SSA
(a) Cochlear- cochlear nuclei
(b) Vestibular- vestibular nuclei
Attachment and nucleus of origin or termination for CN IX
Att.: Post. lateral (olivary) sulcus
N-of-O or T: ALL MEDULLA
(1) GVA- nuc solitarius
(2) SVA- nuc solitarius
(3) GSA- sensory nuc of N5
(4) GVE- inf.. salivatory nuc
(5) SVE- nuc. ambiguus
Attachment and nucleus of origin or termination for CN X
Att.: Post. lateral (olivary) sulcus
N-of-O or T: ALL MEDULLA
(1) GVA- nuc solitarius
(2) SVA- nuc solitarius
(3) GSA- sensory nuc of N5
(4) GVE- dors. motor nuc of 10
(5) SVE- nuc. ambiguus
Attachment and nucleus of origin or termination for CN XI
Att.: Upper cervical spinal between post. and ant. roots
N-of-O: SVE- Accessory nucleus (SPINAL CORD)
Attachment and nucleus of origin or termination for CN XII
Att.: Ant. Lat. (olivary) sulcus
N-of-O: GSE- hypoglossal nuc. medulla
Principal sensory of V is similar to…
N. Cuneatus
Spinal of V is similar to…
N. Proprius
Mesencephalic N. is similar to…
Dorsal root ganglian (sucked into brainstem)
The spinal nucleus receives info about…
Pain
The main sensory nucleus receives info about…
Touch and jaw position
What makes up the facial colliculus?
This bump is formed as a result of CN VII coursing over CN VI
Affect of unilateral corticobulbar damage.
Upper motor neurons
Will spare the upper face on affected side because the facial motor neurons in the facial motor nucleus receive bilateral corticobulbar input. The lower face receives unilateral corticobulbar input only.
What happens if the VII nucleus or nerve is destroyed?
You have killed the final common pathway or lower motor neurons and total paralysis will occur on the affected side.
What’s unique about the path of the facial nerve?
Comes out of facial motor nucleus and loops around the abducens nucleus.
Sulcus limitans
separates sensory nuclei from motor nuclei (motor-medial, sensory-lateral)
Lump on back of thalamus that helps with vision
Lateral geniculus
“Cheerio”
Nuc. Solitarius. The tract is in the center of the nucleus.
Basal is affliated with…
Alar is affliated with…
MOTOR
SENSORY
Golf ball on tee
Lateral lemniscus=tee
Inferior colliculus= golf ball
VPM
Nucleus of the thalamus, which conveys info from the Trigeminal nerve (GSA V) and Nuc of Solitary, to 312
