Neuroanatomy Lab 4

Front 1

Cranial nerves associated with nucleus and tractus solitarius

Back 1

VII, IX, X

Front 2

Cranial nerves associated with nucleus ambigus

Back 2

IX, X, XI

Front 3

Cranial nerves associated with dorsal motor nucleus vagus (parasympathetic)

Back 3

X only

Front 4

Cranial nerves associated with anterior horn

Back 4

XI only
Motor cell bodies in anterior horn [C1-C5]

Front 5

Location of nucleus and tract solitarus

Back 5

Posterolateral medulla (extend from caudal to rostral medulla)

Front 6

Modalities carried by nucleus and tract solitarus

Back 6

– Special sensory [taste] : VII and IX
– Visceral sensory: IX, X

Front 7

Where do the fibers for CN VI, IX, X terminate within the nucleus solitaire

Back 7

- Tastes fibers [7 and 9] terminate in the rostral part
– General visceral afferents [9 and 10] terminate in middle and caudal parts respectively

Front 8

Pathway from nucleus solitarius --> cortex

Back 8

nucleus ambigus --> dorsal motor nucleus of X --> Thalamus (VPM) and hypothalamus --> somatosensory cortex (post central gyrus)

Front 9

What types of information is being carried by cranial nerves IX and X to the nucleus solitarus

Back 9

– Gag reflex [9]
– Stretch of gut, blood pressure receptors, blood oxygen [10]

Front 10

Modalities carried by nucleus ambiguus

Back 10

– Somatic motor : IX and X
– Parasympathetic : vagal neurons to heart

Front 11

Location of nucleus ambiguus

Back 11

Central part of tegmentum of medulla, medial to spinal tract and nucleus of V.
- extends from caudal to rostral medulla

Front 12

Targets for nerves arising from nucleus ambiuus

Back 12

IX and X: voluntary skeletal muscle of
- soft palate
- pharynx
- larynx
- upper part of esophagus

X: Parasympathetic to heart (cardioinhibitory)
- most rostral cells are parasympathetic

Front 13

Where do fibers leaving nucleus ambiuus emerge on brainstem?

Back 13

posterior to olive

Front 14

Modalities carried by dorsal motor nucleus of vagus (DMN X)

Back 14

Parasympathetic (visceral motor)

Front 15

Location of DMN X

Back 15

Dorsal medulla, lateral to hypoglossal nucleus
(extends from caudal to rostral medulla)

Front 16

Input to DMN X

Back 16

from hypothalamus

Front 17

Fibers from DMN X emerge where on brainstem?

Back 17

Groove posterior to olive (as part of X)

Front 18

Targets for fibers leaving DMN X

Back 18

- thoracic viscera and abdominal viscera (smooth muscles and glands of resp and GI tracts)
- cardiac muscle

Front 19

Locations of spinal trigerminal nucleus

Back 19

nucleus extend from cervical spine level to rostral pons

Front 20

Modalities carried by spinal trigeminal nucleus

Back 20

pain and temp (and some touch)

* NB main input to spinal trigeminal nucleus is from CN V

Front 21

Where do neurons leaving trigeminal nucleus travel to?

Back 21

- cross midline
- ascend to VPM of thalamus

Front 22

Location of accessory nucleus

Back 22

cell bodies in anterior horns of C1-C5

Front 23

Accessory nerve path after leaving spinal cord

Back 23

from C1-C5 --> foramen magnum --> join with fibers of X --> exit through jugular foramen --> to target

** corticobulbar fibers to the accesory nucleus project IPSILATERALLY for SCM and CONTRALATERALLY for trapezius

Front 24

Targets for accessory nerve

Back 24

- trapezius
- SCM

Front 25

modalities carried in chief sensory nucleus of V by CN IX

Back 25

general somatic afferent

Front 26

function of spinal trigeminal nucleus & cheif sensory ncl. of V for CN IX

Back 26

general sensation from the posterior 1/3 of tongue, tonsil, skin of external ear, internal surface of tympanic membrane, pharynx

Front 27

Functions of nucleus of tractus solitarius for CN IX

Back 27

- chemoreceptors and baroreceptors from carotid body
- gag sensation from pharynx (afferent limb of gag reflex)
- taste from posterior 1/3 of tongue

Front 28

Function of nucleus ambiguus for CN IX

Back 28

innervation of stylophayngeus m.

Front 29

Function of inferior salivatory nucleus for CN IX

Back 29

stimulation of parotid gland

Front 30

Modality carried by inferior salivatory nucleus for IX

Back 30

General visceral efferent (parasympathetics) to parotid

Front 31

Summary pf 6 main functions of glossophayngeal nerve

Back 31

- general sensation to post 1/3 tongue etc (GSA)
- chemoreceptors and baroreceptors (GVA)
- gag sensation (GVA)
- taste from post 1/3 tongue (SVA)
- stylopharygeus muscle (SVE)
- parotid gland (GVE)

Front 32

GSA functions of vagus

Back 32

Sensation from
- posterior meniniges
- concha
- skin of back of ear and ext. aut meatus
- pharynx
- larynx

Front 33

GVA functions of vagus

Back 33

- larynx
- trachea
- esophagus
- thoracix and abd viscera
- stretch receptors in walls of aortic arch
- chemoreceptors in aortic bodies adj. to arch

Front 34

SVE functions of vagus

Back 34

innervate:
- constrictor muscles of pharynx
- levator palatini
- salpingophayngeus
- palatophayngeus
- palatoglossus
- cricothyroid
- intrinsic muscles of larynx

Front 35

GVE functions of vagus

Back 35

Parasympthetics to:
- smooth muscles and glands of pharynx, larynx and thoracic and abd viscera
- cardiac muscle

Front 36

Clinical signs of damage to nucleus of tractus solitarius

Back 36

- difficulty in regulating BP

Front 37

Clinical signs of damage to nucleus ambiguus

Back 37

- hoarse voice (when unilateral)
- difficulty with phonation
- efferent limb of gag reflex

Front 38

Clinical signs of damage to dorsal vagus of nucleus

Back 38

- trouble with swallowing
- history of tachycardia