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The Brain 06

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  1. The Brain 06 Laboratory Exercise

  2. Objectives • Recognize the medulla, pons, cerebellum, midbrain, diencephalon, and cerebral hemispheres • Recognize the corpus callosum, fornix, septum, rostral commissure, hypophysis, ventricles • Recognize the stumps of the cranial nerves • Recognize the cerebellum and its vermis and hemispheres • Recognize the rostral colliculi, caudal colliculi, and mesencephalic aqueduct • Recognize the medial and lateral geniculate bodies, optic nerves, chiasm and tracts, mamillary bodies, epiphysis (pineal) • Recognize canine cruciate sulcus, marginal sulcus, precruciate, postcruciate, marginal and ectosylvian gyri.

  3. Cerebrum • Longitudinal fissure • Sulci and Gyri • Cerebellum • Vermis • Hemispheres • Brain stem • Diencephalon • Mesencephalon • Metencephalon • Myelencephalon

  4. Cerebrum (Telencephalon) Rhinal sulcus Olfactory bulb Olfactory peduncle Piriform lobe

  5. Ventral surface Diencephalon -Optic nerves (II) -Optic chiasm (25) -Optic tracts (24) -Tuber cinereum (8) -Mammillary bodies (10) 10 III V VI VII Mesencephalon -Crus cerebri -Oculomotor n (III)

  6. Metencephalon -Transverse fibers, pons (13) -Trigeminal nerve V Myelencephalon -Trapezoid body (18) -Pyramids (19) -Abducent nerve VI -Facial nerve VII -Vestibulocochlear nerve VIII -Decussation of the pyramids -Hypoglossal nerve XII III IV V VI V

  7. 10 12 Cerebellar peduncles rostral (12) middle (10) caudal (11) Trochlear nerve IV Dorsal surface Metencephalon, Myelencephalon

  8. Median sulcus Sulcus limitans Obex Fasciculus cuneatus Spinal tract, V Trigeminal nerve V

  9. Corpus callosum Ventricles Fornix Pineal Fourth ventricle Interthalamic adhesion (33) Tectum Rostral commissure (37) Mesencephalic aqueduct Hypothalamus (32)

  10. Dorsal surface, Diencephalon & Mesencephalon Pineal Lateral geniculate (4) Caudal colliculus(8) Medial geniculate(5) Rostral colliculus(6)

  11. Neocortex of the dog Rhinal sulcus Pseudosylvian sulcus Sylvian gyri Ectosylvian sulcus Ectosylvian gyrus -Middle (Auditory) 7’ Cruciate sulcus Precruciate gyrus Postcruciate gyrus Marginal sulcus 16 Marginal gyrus (Visual)

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