Pons & Midbrain Anatomy PDF

Pons Superior to Medulla oblongata. Contains more ascending and descending pathways. Relays information from cerebrum to cerebellum. Also includes sleep and respiratory centers and heat regulation. 10/8/2023 3 ANTERIOR 1-Basilar sulcus of pons 2 Motor (minor) root of trigeminal nerve 3. Senso...

Pons Superior to Medulla oblongata. Contains more ascending and descending pathways. Relays information from cerebrum to cerebellum. Also includes sleep and respiratory centers and heat regulation. 10/8/2023 3 ANTERIOR 1-Basilar sulcus of pons 2 Motor (minor) root of trigeminal nerve 3. Sensory (major) root of trigeminal nerve 4. Abducens nerve 5. Middle cerebellar peduncle 6. Vestibul- ocochlear nerve 7. Facial nerve POSTERIOR 1.Median sulcus of rhomboid fossa 2. Middle cerebellar peduncle 3. Facial colliculus 4. Vestibular area 5. Striae medullares of 4th ventricle 10/8/2023 4 10/8/2023 5 10/8/2023 7 10/8/2023 8 CROSS SECTION OF THE PONS:Showes3 areas:- 1-BASAL:-Common all through consist of cortico-spinal,cortico-nuclear&cortico- pontine cerebellar(middle cerebellar peduncle) 2-TRAPIZOID; IT IS THE AUDITORY PATHWAY(from the cochlea to the cochlear n some relay others cross the crossing are trapezoid) 3-TEGMENTUM:This differ between caudal&cranial consist of tracts &nuclei of the cranial nerves 10/8/2023 9 10/8/2023 10 10/8/2023 11 10/8/2023 12 10/8/2023 15 3 AREAS separated by;1-SUBSANTIA NIGRA 2-CERBRAL AQUEDUCT 1-CRUS CEREBRI:descending tracts(common) SUBSANTIA NIGRA 2- TEGMENTUM: Differ contain tracts& nuclei CERBRAL AQUEDUCT 3-TECTUM: 4 Colliculi 2 superior 2inerior *SUBSANTIA NIGRA:common is a large motor nucleus concerned with muscle tone related to the basal ganglia 10/8/2023 16  Cross-section of Tegmentum Reticular Dorsal formation PAG Substantia Red Nigra Nucleus Ventral Tegmental Area 10/8/2023 19 10/8/2023 20 10/8/2023 21 10/8/2023 22 10/8/2023 23  BLOOD SUPPLY Medulla A-Med.-2 vertebral Art.(Ant.S.A+Baslar) B-Post.Inf.Cerbellar.A PONS: basillar+anterior inferior cerebellar +superior cerebellar arteries MIDBRAIN:Superior cerebellar+posterior cerebral 10/8/2023 24 10/8/2023 25  Reticular Activating System Receives multiple sensory inputs Mediates wakefulness LESIONS MEDULLA;Death due to vital centers of respiration&cardiovascular regulation +cranial nerves lesions Vascular syndrome PONS; Regulation of the heat pontine hemorrhage leads to pyrexia+cranial nerves lesions MIDBRAIN;Loss of visual &auditary reflexes - Hydrocephalus +Parkinsonism+cranial nerves lesions 10/8/2023 28