Trigeminal System N22 Flashcards Preview

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Flashcards in Trigeminal System N22 Deck (33)
1

Origin of Sensory division of Trigeminal N.

Trigeminal ganglion -->
Spinal Trigeminal nucleus/tract
Chief (main/principle) sensory nucleus
Mesencephalic nucleus/tract

2

Origin of Motor division of Trigeminal N.

Motor nucleus of trigeminal n

3

Trigeminal n Sensory division function

GENERAL SOMATIC SINSIBILITY (vibration, touch, conscious and unconscious proprioception, pain and temperature)

4

Trigeminal n Motor division function

innervation of muscles of mastication (temporal is, masseter, medial/lateraly pterygoids, tensor tympani, tensor veli palatine, anterior digastric belly, mylohyoid)

5

Function of general somatic afferent (GSA) components of Trigeminal n.

General sensations of the face, nasal and oral cavities, dura mater and proprioception

6

GSA Nuclei (3)

Spinal Trigeminal Nucleus, Chief (main/principle) sensory nucleus, Mesencephalic nucleus
Which all form a continuous column of cells

7

Spinal Trigeminal Nucleus

Lateral tegmentum of medulla and caudal pons; considered to be a rostral continuation of the SUBSTANTIA GELATINOSA

8

Spinal Trigeminal Tract continuation of ______

Considered to be a rostral continuation of Lissauer's Tract

9

Spinal Trigeminal Tract is analogous to _______

ANTEROLATERAL SYSTEM: pain, temperature, crude touch

10

Chief (Main/Principle) Sensory Nucleus

Located in the dorsolateral pontine tegmentum (midpons)

11

Chief Nucleus Function

Fine touch, 2-pt discrimination, vibration, conscious proprioception of head

12

Chief Nucleus is analogous to ________

DC-ML

13

Mesencephalic Nucleus location

Rostral pons and caudal midbrain

14

Mesencephalic Nucleus Function

UNCONSCIOUS PROPRIOCEPTION - acts as primary sensory ganglia (DRG)

15

Mesencephalic Nucleus is analogous to _____

Spinocerebellar System

16

Peripheral Sensory division is split into 3 divisions:

V1: opthalmic V2: maxillary V3: mandibular (NO overlap)

17

Trigeminal ganglion of the sensory root contains

Cell bodies of peripheral processes; in trigeminal cave (Meckel's) in middle cranial fossa; acts like DRG

18

Trigeminal ganglion of motor root contains

Cell bodies for fibers in V3: mandibular division

19

Primary afferent axons will enter either

Chief sensory nucleus at same level (midpons) or descend to spinal trigeminal nucleus

20

Chief Nucleus receives which primary afferent axons

Large afferent inputs for fine touch, vibratory and conscious proprioception

21

Spinal Trigeminal Nucleus receives which primary afferent axons

Small afferent inputs for pain, temperature, and crude touch

22

Afferents path to synapse on Spinal trigeminal nucleus

descend lateral to spinal trigeminal nucleus as SPINAL TRACT OF TRIGEMINAL N (Sp V Tr)

23

Mesencephalic nucleus receives

afferents that travel from the periphery via mesencephalic tract for unconscious proprioception information from muscle spindles in the muscles of mastication

24

Motor Component fibers paths

Motor Trigeminal nucleus (pons)--> middle cerebellar peduncle --> V3

25

Motor trigeminal nucleus receives

bilateral cortical input

26

Ventral Trigeminothalamic Tract (VTTT) have fibers from which two nuclei

Spinal trigeminal and Chief sensory

27

VTTT fibers from Spinal Trigeminal Nucleus

Exit nucleus --> decussate --> ascend as VTTT (near ALS) --> VPM of thalamus --> lateral primary somatosensory cortex (3,1,2)

28

VTTT fibers from Spinal Trigeminal Nucleus carry

sensory information for slow, dull pain, and reflexes

29

Reflexes from VTTT spinal Trigeminal Nucleus synapse on

Reticular Formation

30

VTTT fibers from Chief Sensory Nucleus

Exit nucleus --> decussate --> ascend as VTTT (near ML) --> VPM of thalamus --> lateral primary somatosensory cortex (3,1,2)

31

VTTT fibers from Chief Sensory Nucleus carry

sensory information for 2-point discrimination, fien touch, vibration, conscious proprioception

32

Dorsal Trigeminothalamic Tract (DTTT)

small, IPSILATERAL, from chief nucleus to ipsilateral VPM

33

Processes leaving the Spinal trigeminal nucleus

1. VTTT --> VPM of thalamus
2. Reticular formation --> Intralaminar thalamic nuclei
3. PAG and SC --> reflexive movement of head and control of pain