PONS
D r . M e h u l T a n d e l
Objectives:
(1) External features of Pons
(2) Internal features of Pons– cross sections
(1) At the level of Facial Collicu...
Connects the medulla &
midbrain
Function
Transmit information
between spinal cord
& higher brain
regions via neural
circui...
PONS
PONS
M
C
P
Length – 2.5 cm
External features ..
1. Dorsal & ventral surfaces…
- transvereslystriated
2. Basilar sulcu...
PONS External features
Cerebello-pontine
angle
Facial Colliculus
Vestibular Area
MID BRAIN
PONS
4th ventricle
PONS
Posterior surface
6th C.N.
7th C.N.
8th C.N.
Anterior surface
5th C.N.
Lower
part
Upper part
Internal features
• By 2 sections.
• (1) At lower part of medulla
Fascial Colliculus
• (2) At upper ...
• The pons is divisible into - ventral part (basilar) &
dorsal part (Tegmentum).
Ventral (basilar) part
- The basilar (ven...
C.S. at Fascial Colliculus
C.S. of At motor & Sensory Nucleus
of Trigeminal nerve
Basilar Part
VENTRAL (BASILAR) PART
Ventral(Basilar)PartPons
GREY MATTER
Pontine nuclei:
Afferents - Corticopontine fibres of the same side.
Efferents - Ponto...
WHITE MATTER
Longitudinal fibres:- Corticospinal and Corticonuclear (pyramidal) tracts.
Transverse fibres:- Pontocerebella...
Tegmentum of pons (dorsal part)
Differs in upper & lower part of pons
C.S. at Facial Colliculus
Abducent
Nucleus
Motor Nucleus
of Facial Nerve
Internal genu -
Facial Colliculus
Neurobiotaxis ?
C.S. at Facial Colliculus
Superior
salivatory
Nucleus
Lacrimatory
Nucleus
Nucleus Tractus
Solitarius –
Upper End
C.S. at Facial Colliculus
Vestibular
Nucleus
Spinal Nucleus &
Spinal Tract of V
Superior Olivary Nuclear Complex
Principal
Superior
Olivary
Nucleus
Accessory
Superior Olivary
Nucleus
Retro - Olivary
Nuc...
Central
Tegmental Tract
C.S. at Facial Colliculus
C.S. at Facial Colliculus
Middle
Cerebellar
Peduncle
Inferior
Cerebellar
Peduncle
C.S. at Facial Colliculus Dorsal
Cochlear
Nucleus
Ventral Cochlear
Nucleus
Juxta Restiform
Body
Vestibular
Nucleus
C.S. of At motor & Sensory Nucleus
of Trigeminal nerve
Trigeminal nuclie – Motor & Sensory
Nucleus Ceruleus
Trigeminal nuclie – Motor & Sensory
Trigeminal nuclie – Motor & Sensory
Trigeminal Ganglion
Muscles of Mastication
Tensor Tympani
Tensor veli Palatini
Ant Belly of Digastric
Motor Nucleus Of
V Nerve
Sensory Nuclei Of Vth Nerve
Spinal Nucleus
Pain & Temperature
Mesencephalic - Proprioceptive
Principal Sensory
Touch & Pre...
Sensory Nuclei Of
V Nerve
Pain & Temperature
Spinal Nucleus Of V Nerve
Efferent:
- Ventral trigemino
thalamic tract
(Trigeminal Lemniscus)
- Terminate : VPM of
Thalamus
Nuclie Of
V Nerve
VPM
Vestibulo-cochlear Nerve
8th C.N.
Vestibulo-Component
Inferior
Superior
Vestibular-Component
Afferent
Efferent – 1. MLF
• Intrduction / Definition
• Extent
• Formation
• Function
• Applied – MLF Syndrome
– Ipsilateral palsy ...
Efferent – 2.
Cerebellum
Efferent – 3. Hair Cells of Macula & Ampullary crest
Modulation Of Sensory Input
Efferent – 4. Spinal Cord
Cochlear-Component
Auditory Pathway
Afferent:
Efferent:
Efferent:
Efferent:
Area 41, 42
Blood supply:
Pontine branch of Basilar artery
Anterior cerebellar artery
Inferior cerebellar artery &
Superior cerebellar...
LESION OF PONS:
Cerebello – Pontine Syndrome
Due to:
Acoustic neuroma
of vestibular nerve
Compress angle
Cerebello – Pontine Syndrome
1. VIII Nerve
Persistent tinnitus, Progressive Deafness
Nystagmus, Nausea, Vomiting and Verti...
Raymond’s Syndrome = Alternating Abducent
Hemiplegia
Occlusion of
Paramedian branches of
Basilar artery
1. 6th Nerve
Ipsil...
Millard - Gubler Syndrome = Alternating Facial
Hemiplegia
Occlusion of
Paramedian branches of
Basilar artery
1. 7th Nerve
...
Alternating Trigeminal Hemiplegia
1. 5th Nerve
- Ipsilateral loss of pain and
tepmperature sensation from the
face (facial...
THANK YOU
of 55

Pons Anatomy

Dr. Mehul Tandel Assistant Professor Anatomy Department Pramukhswami Medical College Karamsad, Gujarat
Published on: Mar 4, 2016
Published in: Health & Medicine      
Source: www.slideshare.net


Transcripts - Pons Anatomy

  • 1. PONS D r . M e h u l T a n d e l
  • 2. Objectives: (1) External features of Pons (2) Internal features of Pons– cross sections (1) At the level of Facial Colliculus (2) At the level of Motor & Sensory Nucleus of trigeminal nerve (3) Blood supply with Applied aspects
  • 3. Connects the medulla & midbrain Function Transmit information between spinal cord & higher brain regions via neural circuits Relay motor information between cerebral cortex & cerebellum
  • 4. PONS PONS M C P Length – 2.5 cm External features .. 1. Dorsal & ventral surfaces… - transvereslystriated 2. Basilar sulcus (vertical) .. Lodges Basilar Artery. 3. Dorsal surface forms upper part of floor of 4th Ventricle. 5. Laterally .. Continuous with Middle Cerebellar Peduncle - trigeminal nerve 6. Superior border - 3rd ,4th 7. Inferior border .. With 6th, 7th & 8th C.N. BASILAR GROOVE
  • 5. PONS External features Cerebello-pontine angle Facial Colliculus Vestibular Area
  • 6. MID BRAIN PONS 4th ventricle PONS Posterior surface 6th C.N. 7th C.N. 8th C.N. Anterior surface 5th C.N.
  • 7. Lower part Upper part Internal features • By 2 sections. • (1) At lower part of medulla Fascial Colliculus • (2) At upper part At motor & Sensory Nucleus of Trigeminal nerve
  • 8. • The pons is divisible into - ventral part (basilar) & dorsal part (Tegmentum). Ventral (basilar) part - The basilar (ventral) part has a uniform structure throughout length of pons. - contains transverse and vertical fibres & Pontine nuclei. (i) Transverse fibres are the pontocerebellar fibres- cross the midline to enter the opposite middle cerebellar peduncle. (ii) The vertical fibres - - Some of them descend from cerebral cortex to end in the pontine nuclei. (corticopontine) - Corticospinal fibres that descend through the pons in to the medulla . - Corticonuclear fibres end in the motor nuclei of cranial nerves mainly of opposite side. Internal = Basilar & Tegmental Part -The basilar (Ventral) part - Uniform structure throughout -Tegmentum (dorsal) part - Differs in upper & lower part of pons.
  • 9. C.S. at Fascial Colliculus
  • 10. C.S. of At motor & Sensory Nucleus of Trigeminal nerve
  • 11. Basilar Part
  • 12. VENTRAL (BASILAR) PART
  • 13. Ventral(Basilar)PartPons GREY MATTER Pontine nuclei: Afferents - Corticopontine fibres of the same side. Efferents - Pontocerebellar fibres that cross the midline & pass through the middle cerebellar peduncle to enter the cerebellum. (Cortico-ponto-cerebellar pathway) Middle cerebellar peduncle
  • 14. WHITE MATTER Longitudinal fibres:- Corticospinal and Corticonuclear (pyramidal) tracts. Transverse fibres:- Pontocerebellar Going to opposite half of cerebellum through middle cerebellar peduncle Ventral(Basilar)PartPons
  • 15. Tegmentum of pons (dorsal part) Differs in upper & lower part of pons
  • 16. C.S. at Facial Colliculus Abducent Nucleus Motor Nucleus of Facial Nerve Internal genu - Facial Colliculus Neurobiotaxis ?
  • 17. C.S. at Facial Colliculus Superior salivatory Nucleus Lacrimatory Nucleus Nucleus Tractus Solitarius – Upper End
  • 18. C.S. at Facial Colliculus Vestibular Nucleus Spinal Nucleus & Spinal Tract of V
  • 19. Superior Olivary Nuclear Complex Principal Superior Olivary Nucleus Accessory Superior Olivary Nucleus Retro - Olivary Nucleus
  • 20. Central Tegmental Tract
  • 21. C.S. at Facial Colliculus
  • 22. C.S. at Facial Colliculus
  • 23. Middle Cerebellar Peduncle Inferior Cerebellar Peduncle
  • 24. C.S. at Facial Colliculus Dorsal Cochlear Nucleus Ventral Cochlear Nucleus
  • 25. Juxta Restiform Body Vestibular Nucleus
  • 26. C.S. of At motor & Sensory Nucleus of Trigeminal nerve
  • 27. Trigeminal nuclie – Motor & Sensory
  • 28. Nucleus Ceruleus
  • 29. Trigeminal nuclie – Motor & Sensory
  • 30. Trigeminal nuclie – Motor & Sensory Trigeminal Ganglion
  • 31. Muscles of Mastication Tensor Tympani Tensor veli Palatini Ant Belly of Digastric Motor Nucleus Of V Nerve
  • 32. Sensory Nuclei Of Vth Nerve Spinal Nucleus Pain & Temperature Mesencephalic - Proprioceptive Principal Sensory Touch & Pressure From- Ipsilateral Face 1st Order Neuron
  • 33. Sensory Nuclei Of V Nerve
  • 34. Pain & Temperature Spinal Nucleus Of V Nerve
  • 35. Efferent: - Ventral trigemino thalamic tract (Trigeminal Lemniscus) - Terminate : VPM of Thalamus Nuclie Of V Nerve VPM
  • 36. Vestibulo-cochlear Nerve 8th C.N.
  • 37. Vestibulo-Component Inferior Superior
  • 38. Vestibular-Component
  • 39. Afferent
  • 40. Efferent – 1. MLF • Intrduction / Definition • Extent • Formation • Function • Applied – MLF Syndrome – Ipsilateral palsy of medial rectus – Contralateral Mononuclear horizontal nystagmus on adduction of eye
  • 41. Efferent – 2. Cerebellum
  • 42. Efferent – 3. Hair Cells of Macula & Ampullary crest Modulation Of Sensory Input
  • 43. Efferent – 4. Spinal Cord
  • 44. Cochlear-Component Auditory Pathway
  • 45. Afferent:
  • 46. Efferent:
  • 47. Efferent:
  • 48. Efferent: Area 41, 42
  • 49. Blood supply: Pontine branch of Basilar artery Anterior cerebellar artery Inferior cerebellar artery & Superior cerebellar artery. Venous Drainage Into: Inferior petrosal sinus and Basilar plexus. PONS
  • 50. LESION OF PONS: Cerebello – Pontine Syndrome Due to: Acoustic neuroma of vestibular nerve Compress angle
  • 51. Cerebello – Pontine Syndrome 1. VIII Nerve Persistent tinnitus, Progressive Deafness Nystagmus, Nausea, Vomiting and Vertigo. 2. Cerebellar Lesions Ipsilateral cerebellar signs e.g.,Tremor,Ataxia, Dysmetria (Past Pointing) 3.Spinaltrigeminalnucleusandtract: Ipsilaterallossofpainandtemperaturesensationfromthe face(facialhemianesthesia) 4.FacialNerve: IpsilateralBellsPalsy, Hyperacusis,LossofTaste
  • 52. Raymond’s Syndrome = Alternating Abducent Hemiplegia Occlusion of Paramedian branches of Basilar artery 1. 6th Nerve Ipsilateral paralysis of lateral rectus – Internal Squint 2. Pyramidal Tract Contralateral Hemiplegia
  • 53. Millard - Gubler Syndrome = Alternating Facial Hemiplegia Occlusion of Paramedian branches of Basilar artery 1. 7th Nerve IpsilateralBellsPalsy, Hyperacusis,LossofTaste 2. Pyramidal Tract Contralateral Hemiplegia
  • 54. Alternating Trigeminal Hemiplegia 1. 5th Nerve - Ipsilateral loss of pain and tepmperature sensation from the face (facial hemianesthesia) - LMN paralysis of masticatory muscles 2. Pyramidal Tract Contralateral Hemiplegia
  • 55. THANK YOU

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