lec 1

Question 1

CN I name, type, exit

Answer 1

Olfactory, sensory, cribiform plat of ethmoid bone

Question 2

CN II name, type, exit

Answer 2

Optic, sensory, optic canal

Question 3

CN III name, type, exit

Answer 3

Oculomotor, motor, efferent + PSNS, sup orbital fissue

Question 4

CN IV name, type, exit

Answer 4

Trochlear, motor efferent, Sup orbital fissure

Question 5

CN Va name, type, exit

Answer 5

Trigeminal Opthalamic, afferent sensory, Sup orbital fissure

Question 6

CN Vb name, type, exit

Answer 6

Trigeminal Maxillary, afferent sensory, foramen rotundum

Question 7

CN Vc name, type, exit

Answer 7

Trigeminal Mandibular, afferent sensory and efferent motor, foramen ovale

Question 8

CN VI name, type, exit

Answer 8

Abducens, motor efferent, Sup orbital fissure

Question 9

CN VII name, type, exit

Answer 9

Facial, motor efferent sensory afferent taste, Internal auditory meatus

Question 10

CN VIII name, type, exit

Answer 10

Vestibular Cochlear, sensory afferent, Internal auditory meatus

Question 11

CN IX name, type, exit

Answer 11

Glossopharyngeal, efferent motor afferent sensory taste, jugular foramen

Question 12

CN X name, type, exit

Answer 12

Vagus, afferent sensory efferent motor taste, Jugular foramen

Question 13

CN XI name, type, exit

Answer 13

Spinal Accessory, efferent motor, jugular foramen

Question 14

CN XII name, type, exit

Answer 14

Hypoglossal, motor efferent, hypoglossal canal

Question 15

Efferent action of body

Answer 15

Axons of UMNs in motor homunculus - internal capsule - decussate - corticospinal tract - LMNs in lamina 9 - ventral root - dorsal or ventral primary rami - target

Question 16

Efferent action of Orofacial

Answer 16

UMNs in motor homunculus - internal capusle - decussate - corticobulbar tract - LMNs in motor nucleus brainstem - go along cranial nerves to target

Question 17

Loc of Cranial Motor Nuclei and order

Answer 17

Brainstem and rostral-caudel order

Question 18

Motor Nuclei Names

Answer 18

All named after nerve except nucleus ambiguous (LMNs for 9 and 10)

Question 19

Cortico bulbar tract synapse info and CN innervation of exceptions

Answer 19

All except 3, 4(Sup oblique), 6(lateral rectus). Exceptions dont receive commands from motor homunculus

Question 20

Motor Nuclei info for CN XI

Answer 20

Innervates only trap and sternocleidomastoid muscles. LMNs in lam 9 in upper cervical region activated by corticospinal pathway. Axons to foramen magnum w/ CN 9 and 10

Question 21

Lesion in UMN

Answer 21

paralysis of assoc muscle on contralateral side, spasticity, and no regen

Question 22

Lesion in LMN

Answer 22

Ipsilateral flaccidity, weakness, regen possible

Question 23

Organization of Brain Stem

Answer 23

midbrain (CN 3) pons (CN 5 6) medulla oblongata (CN 7 9 10 12 *11 special), Nerves leave brainstem in order

Question 24

Sensory nerve info for orofacial

Answer 24

trigeminal

Question 25

Gen info for pain and touch somatic

Answer 25

3 sets of neurons, loc of 1st order cell bodies in afferent gang outside CNS - no synapse, modality specific, cell bodies in DRG

Question 26

Pain Path Somatic

Answer 26

syn on 2nd in lam 1/2 level of entry - decussates - lat spino thalamic tract - syn 3rd at VPL - sense hom

Question 27

Touch path Somatic

Answer 27

ascend dorsal column - syn 2nd in nuc gracilis or cuneatus in brainstem - decussate - syn in VPL - 3rd to sense hom

Question 28

Gen info sense orofacial

Answer 28

3 sets of neurons, modality specific, By trigeminal nerve territory specific. 1st order bodies in trigeminal ganglion. central branch synapses in a nuc in brainstem having cell bodies of 2nd. 2nd decussates ascends to 3rd in VPM to sense hom

Question 29

Orofacial Pain Path

Answer 29

1st cell bodies = trigeminal gang, central axons for all V enter brainstem and descend together as spinal tract - along the way axons leave to syn on 2nd along spinal nucleus, 2nd decussate ascend to 3rd in VPM (spinal tract sim to lam 1/2)

Question 30

Orofacial touch path

Answer 30

1 cb = trigeminal gang, syn 2 in pantine nuc, dec, VPM (pantine sim to gracilis/ cuneatus)

Question 31

Autonomic Pathways gen

Answer 31

PSNS and SNS = motor only, preg cb in CNS, postg neuron in periph. Input driven by hypothalamus, PSNS (cranial sacral) SNS (thoracic lumbar)

Question 32

Targets of SNS and PSNS

Answer 32

Salivary Glands (parotid, submandibular, sublingual). Mucous glands of nose + pharynx Orbital structures: lacrimal gland, spincter and ciliary muscles of iris P, Dilator muscle of iris S, sp tarsal muscle S blood vessels S sweat glands

Question 33

SNS path to head and orofacial

Answer 33

Preg neurons in lam 7 (intermediolateral horn at T1,2) exit via ventral root and enter sym chain via wrc course up sym chain to sup cervical gang syn to post g follow blood vessels to target

Question 34

Horners Syn Causes

Answer 34

Disruption of Sym (compression of cervical or thoracic sym chains on affected side, Pancoast tumor on apex on lung)

Question 35

Horners Syn symptoms

Answer 35

Pseudoptosis (drop eye - para of sup tarsal musc) Miosis (cons of pupil - inact of dilator musc) Enophthalmos (sunken eye - inact of muellers musc) reduced sweat (anhidrosis) Flush face - blood v dilation

Question 36

CNs w/ PSNS fx gen

Answer 36

3, 7, 9, 10. Each has a nuc w/ preg loc in brainstem act by hypothalamus. at least one gang outside CNS w/ postg neurons. Set of targets

Question 37

CNs w/ PSNS CN III

Answer 37

Regs sphincter muscles of eye. Preg in Nuc of Edinger-Westphal exit in CN3 and syn on postg neurons in ciliary ganglion

Question 38

CNs w/ PSNS CN VII

Answer 38

Regs lacrimal, submandibular, and sublingual glands. Superior salivatory nuc exit CN7 to syn postg in 2 diff ganglia (pterygopalatine and submandibular)

Question 39

CNs w/ PSNS CN IX

Answer 39

Regs parotid gland. inf salivatory nuc exit in CN 9 and syn postg in otic ganglion

Question 40

CNs w/ PSNS CN X

Answer 40

Regs viscera of thorax and abd. preg from dorsal motor nuc.