Cranial Nerve

Question 1

Neural tube

Classification of nuclei

Answer 1

Divided by sulcus terminalis into two part

1) alar - sensory - Posterior —⟩ lateral
2) Basal - motor - Anterior —⟩ medial

Classification
> Efferent
- general somatic efferent
- general visceral efferent
- special visceral efferent

> Afferent

• general somatic efferent
• special somatic efferent
• general visceral efferent
• general somatic efferent

Question 2

Efferent

Answer 2

1) general somatic - motor supply to somatic origin
- head and neck muscles derived from somites
- extraoricular muscle - 3,4,6
- tongue muscle - 12
- diaphragm - phrenic nerve

> Nucleus present in GSE - 3,4,6,12

Special visceral efferent - motor supply to pharyngeal arch

• mandibular 5th nerve
• glossopharyngeal
• Fascial
• superior and recurrent laryngeal - 10 th nerve

GLOSSOPHARYNGEAL AND LARYNGEAL NERVE HAS NUCLEUS AMBIGUOUS

General visceral efferent - parasympathetic column

• INFERIOR SALIVATORY —⟩ 9 th nerve —⟩ nucleus otic —⟩ parotid ganglion
• SUPERIOR SALIVATORY —⟩ 7th Nerve —⟩ submandibular ganglion —⟩ submandibular and sublingual
• LACRIMATORY NUCLEUS ( caudal part of superior SALIVATORY nucleus) —⟩ 7th Nerve —⟩ lacrimal, nasal, palatal
• edinger westphal nucleus —⟩ 3rd nerve —⟩ ciliary ganglion —⟩ Spincter pupillae
• Dorsal nucleus of vagus - lung, heart, foregut, midgut

Question 3

Afferent

Answer 3

1) SVA and GVA - common nucleus - nucleus tractus solitarius
2) SVA - taste sensation - 7th, 9th, 10
3) GSA - nucleus of trigeminal - mesencephalic, chief sensory (pons), spinal (medulla and C1, C2)
- nerve = 5,7,9,10

4) SSA - vestibular, cochlear.