This document discusses cranial nerves 1-6 through a series of presentations. It begins with an overview of cranial nerves 1 and 2, including their distribution and connections. It then examines cranial nerves 3, 4, and 6, with sections on their nuclei, connections and course. Cranial nerve 5 is then reviewed in depth, including its nucleus, course through the skull, distribution and motor/sensory branches. Diagrams are provided to illustrate key structures and pathways. The document concludes by referencing additional sources for further information.

2. PRESENTERS:
Dr. Heshma Umama Upama
Dr. Puja Shah
Dr. Md. Rayhan Faruk
Sajon
CRANIAL NERVES
(1-6)

3. CRANIAL NERVES 1 & 2
PRESENTER:
Dr. Heshma Umama Upama
Resident (Phase-A)
Department of Endocrinology & Metabolism
BSMMU

8. Figure: A. Distribution of the olfactory nerves on the lateral wall of the nose.
B. Connections between the olfactory cells and the neurons of the olfactory bulb.
C. Connections between the olfactory cell and the rest of the olfactory system.

17. Figure: Visual pathway.

24. Figure: Optic pathway and the visual reflexes.

25. CRANIAL NERVES 3,4 & 6
PRESENTER:
Dr. Puja Shah
Resident (Phase-A)
Department of Endocrinology & Metabolism
BSMMU

28. CN III: CONNECTIONS
THE MAIN OCULOMOTOR NUCLEUS RECEIVES
Corticonuclear fibers from both cerebral hemispheres.
Tectobalbar fibers from the superior colliculus (through this route
it receives information from visual cortex).
fibers from MLF by which it is connected to the 4th, 6th & 8th
cranial nerves.
ACCESSORY PARASYMPATHETIC NUCLEUS RECEIVES
Corticonuclear fibers for the accommodation reflex
Fibers from the pretectal nucleus for direct & consensual light
reflex.

29. Figure: Oculomotor nerve nuclei and their central
connections.

30. Figure: Course of Oculomotor nerve

34. Figure: Trochlear nerve nuclei and their
connection.

35. TROCHLEAR NERVE (IV)- View from below
• Only cranial nerve to emerge dorsally
• Crossed cranial nerve
• Very long and slender
Internal carotid artery
Postr. communicating
artery
III
VI
Postr.cerebral artery
Supr.cerebellar artery
Basilar artery
IV

38. Figure:Abducent nerve nuclei and their connection

41. CRANIAL NERVE 5
PRESENTER:
Dr. Md. Rayhan Faruk Sajon
Resident (Phase-A)
Department of Endocrinology & Metabolism
BSMMU

42. TRIGEMINAL NERVE
 It is the largest cranial nerve
 It carries General somatic afferent &
Branchial efferent fibers

43. Figure: Nucleus of Trigeminal nerve

44. Figure: Nucleus of Trigeminal nerve.

45. Figure: Nucleus of Trigeminal nerve (posterior view).

46.  The trigeminal nerve emerges from anterolateral
surface of the pons as a large sensory root & a
small motor root.
 These root continue forward from posterior cranial
fossa to middle cranial fossa by passing over the
medial tip of petrous part of temporal bone.
CN V: Trigeminal Nerve
(Course)

49. Figure: Course of Trigeminal nerve.

50. Figure: Distribution of Trigeminal nerve.

53. Mandibular nerve gives rise to four terminal branches in
the infra-temporal fossa:
Buccal nerve, Inferior alveolar nerve, Auriculotemporal
nerve and Lingual nerve.
These branches innervate the skin, mucous membrane
of
• Floor of oral cavity
• External ear
• Lower lip
• Chin
• Anterior 2/3rd of tongue(only general sensation)
• Lower molar,Incisor and canine teeth and associated
gingiva.
Branches of Trigeminal Nerve

54. Figure: Sensory nerve supply to the
skin of the head and neck.

55. Motor supply of Trigeminal nerve

57. REFERENCES
 Snell, Richard S, Splittgerber Ryan, 2019. Snell's Clinical
Neuroanatomy, 8th ed. Philadelphia: Wolters Kluwer/Lippincott
Williams & Wilkins
 Ralston, Stuart H., Ian D. Penman, Mark W. J. Strachan, and
Richard Hobson, eds. 2018. Davidson’s Principles and Practice of
Medicine. 24th ed. London, England: Elsevier Health Sciences.