FACIAL NERVE (VII)

Question 1

VII and VIII CN originate together in the…

Answer 1

Pontocerebellar angle (sitio típico de tumores que causan paresia facial, dificultad para mover la cara)

Question 2

The facial nerve enters the temporal bone through the….

Answer 2

INTERNAL ACOUSTIC MEATUS

Question 3

In the superior-external quadrant of the IAM, the facial nerve enters with fibers coming in the form of:

Answer 3

Nervous intermedius and motor root of facial nerve.
Through the rest of quadrants VIII fibers enter.

Question 4

Nervus intermedius will carry … from the superior salivary nucleus and …. from the nucleus tractus solitarius. The motor root of facial nerve will carry….

Answer 4

PS efferents, special visceral afferents. Somatic efferents

Question 5

From the IAM, the facial nerve enters the…

Answer 5

FACIAL CANAL

Question 6

1st portion of facial nerve is called…

Answer 6

Labyrinthic

Question 7

The sensory neuronal bodies (somatic and visceral afferents) of the VII CN are located in the…

Answer 7

Geniculate ganglion

Question 8

1st portion of the facial nerve goes…

Answer 8

Forwards and outwards

Question 9

2nd portion of facial nerve goes…

Answer 9

Posterior, downwards and outwards

Question 10

The 1st portion of the facial nerve gives one branch from the geniculate ganglion:

Answer 10

Greater petrosal nerve

Question 11

Greater petrosal nerve carries…

Answer 11

Visceral efferents to lacrimal glands (its postganglionic neuron arises at the Sphenopalatine ganglion and reaches the lacrimal gland for secretion of tears).

Question 12

If we have a paralysis of the facial nerve, por qué se queda el ojo seco?

Answer 12

Because greater petrosal nerve from the 1st portion carries visceral efferents to lacrimal glands

Question 13

Lesser petrosal nerve carries visceral efferents but from the…

Answer 13

GLOSSOPHARYNGEAL NERVE (IX), enters the geniculate ganglion from where it arises as the lesser petrosal nerve, goes to the OTIC ganglion and to the parotid

Question 14

The 2nd portion of the facial nerve, after going downwards…

Answer 14

Gives off no branches

Question 15

3rd portion of the facial nerve goes … and gives off different branches

Answer 15

Descends vertically and forwards

Question 16

The stapedius nerve comes from the … portion of the facial nerve and … (function)

Answer 16

3rd, attenuates high pitched sounds
(Una persona con parálisis facial es muy poco tolerante a los sonidos agudos)

Question 17

Posterior auricular branch from the … portion of the facial nerve provides somatic motor innervation to…

Answer 17

3rd, stylohyoid and posterior belly of the digastric

Question 18

CHORDA tympani from the … portion of the cranial nerve carries both … fibers

Answer 18

• parasympathetic visceral afferents: taste input from 2/3 tongue
• parasympathetic visceral efferents: submaxillary and sublingual glands (submandibular ganglion)

Question 19

CHORDA tympani incorporates to…

Answer 19

Lingual nerve, branch of the Trigeminal (which controls general sensory of the anterior 2/3 of tongue)

Question 20

Si se da un corte antes de la cuerda del tímpano, se ve afectado el gusto de la lengua?

Answer 20

Sí, si se diera después no.

Question 21

The facial nerve exits the cranium through… foramen giving somatic motor fibers

Answer 21

STYLOMASTOID FORAMEN

Question 22

The somatic fibers of the facial nerve penetrate … and gives 2 trunks:

Answer 22

The parotid gland (although it does not innervate it)
- temporal facial and cervicofacial trunks.

Question 23

Branches that arise from temporofacial trunk

Answer 23

• FRONTAL /TEMPORAL NERVE: eyelids
• ZYGOMATIC NERVE: lip

Question 24

Branches that arise from cervicofacial trunk:

Answer 24

• Buccal nerve
• Marginal mandibular nerve
• Cervical nerve : PLATISMA

Question 25

Esquema nervio facial

Answer 25

Question 26

Resumen tipos de fibras nervio facial

Answer 26

Question 27

Resumen tipos de fibras nervio facial

Answer 27