Content:
Introduction: 0:00
Topography of Midbrain: 01:02
Anterior Surface of Midbrain: 01:35
Posterior Surface of Midbrain: 03:06
Internal Surface of Midbrain: 06:10
Gray Matter of Midbrain 07:05
White Matter of Midbrain 13:27
White Matter: Ascending Tracts 13:44
White Matter: Descending Tracts 16:40
QUIZ! 21:51


Channel membership:    / @taimtalksmed  
Follow my IG:   / taimtalksmed  
Donation link: https://www.buymeacoffee.com/taimtalk...


Topograpgy of the Mesencephalon:
Lies above the Pons, Below Diencephalon, In front of the Cerebellum
Anterior Surface
Postrior Surface

Anterior Surface of the Mesencephalon:
Cerebral Peduncles (Pedunculus Cerebri)
Interpeduncular Fossa (Fossa Interpeduncularis)
○ Posterior Perforated Substance (Substantia Perforata Posterior)
○ Oculomotor Sulcus of Mesencephalon (Sulcus Nervi Oculomotorii)
○ 3rd Cranial Nerve (Oculomotor nerve)

Posterior View of the Mesencephalon:
Cerebral Peduncles (Pedunculus Cerebri)
Tectal Plate (Lamina Tecti)
○ Superior Colliculus (Colliculi Superior)
§ Visual Pathway:
§ Receptors of Optic Nerve (CNII)
§ Optic Chiasm
§ Lateral Geniculate Body (Metathalamus)
§ Primary Visual Cortex
§ Brachium of the Superior Colliculi (Brachium Colliculi superior)
○ Inferior Colliculus (Colliculi Inferior)
§ Auditory Pathway:
§ Cochlear Nerve
§ Cochlear Nuclei
§ Lateral Lemniscus
§ Inferior Colliculi
§ Brachium of the Inferior Colliculi (Brachium Colliculi Inferior)
§ Primary Auditory Cortex (Superior Temporal Gyrus)
Lateral Sulcus of Mesencephalon (Sulcus Lateralis Mesencephali)
Trigone of Lateral Lemniscus (Trigonum Lemnisci Lateralis)
Trochlear Nerve (CN IV)

Internal Surface of the Mesencephalon:
Tectum of Midbrain
Tegmentum of Midbrain
Cerebral Peduncles

Gray Matter of Mesencephalon:
Red Nucleus (Nucleus Ruber)
○ Corticopontine Tract
○ PontoCerebellar Tract (Transverse Pontine Fibers)
○ Cerbellorubral Tract
○ Rubrospinal Tract
Substantia Nigra
○ Substantia Nigra pars Reticulata
○ Sibstantia Nigra pars Compacta
§ Part of Basal Ganglia (Putamen, Globus Pallidus, Caudate, Thalamus, Subthalamus, Striatum, Lentiform Nucleus)
§ Help Start Movement, Stop Movement Modulate Movement
§ Disease here causes Parkinsons Disease and TRAP symptoms (Tremor, Rigidity, Akinesia, Postural Instability)
Superior Colliculi level:
○ Nucleus of oculomotor nerve (Nuclei nervi oculomotorii)
○ Posterior Accessory Nucleus of Oculomonor Nerve (Nucleus accessorii nervi oculomotorii)
Inferior Colliculi level:
○ Nucleus of Trochlear nerve (Nuclei nervi trochlearis)
○ Mesencephal nucleus of Trigeminal Nerve (Nucleus mesencephalicus nervi trigemini)
Periaqueductal Grey Substance (Substantia Grisea Centralis)
Reticular Formation (Formatio Reticularis)

White Matter of Mesencephalon:
Ascending Tracts
Medial Lemniscus (Lemniscus Medialis)
○ Gracile Fascicle (Fasciculus Gracilis) to Gracile Nucleus
○ Cuneate Fascicle (Fasciculus Cuneatus) to Cuneate Nucleus
○ Medial Lemniscus is formed through Internal Arcuate Fibers (Fibrae Arcuatae Internae)
○ Epicritic Sensibility (Proprioception and Mechanoreceptios)
Spinal Lemniscus (Lemniscus Spinalis)
○ Anterior Spinothalamic Tract (Tractus Spinothalamicus Anterior)
○ Lateral Spinothalamic Tract (Tractus Spinothalamicus Lateralis)
Trigemincal Lemniscus (Lemniscus Trigeminalis)
Anterior Spiniocerebellar Tract (Tractus Spinocerebellaris Anterior)
Lateral Lemniscus (Lemniscus Lateralis)
○ From Cochlear Nerve
Descending Tracts
○ Vestibulospinal Tract (Tractus Vestibulospinalis)
○ Rubrospinal Tract (Tractus Rubrospinalis)
○ Tectospinal Tract (Tractus Tectospinalis)
○ Posterior Tegmental Decussation (Decussatio Tegmentalis Posterior)
○ Reticulospinal Tract (Tractus Reticulospinalis)
○ Anterior Tegmental Decussation (Decussatio Tegmentalis Anterior)
○ Medial Longitudinal Fasciculus (Fasciculus Longitudinalis Medialis)
In the Cerebral Peduncles
○ Corticospinal Tract (Tractus Corticospinalis)
○ Corticonuclear Tract (Corticobulbar tract)
○ Corticopontine tract (Tractus Corticopontineus)
§ Frontopontine Tract
§ Parietopontine Tract
§ Temporopontine Tract
§ Occipitopontine Tract

QUIZ

Sources used in this video:
Memorix Anatomy 2nd Edition by Hudák Radovan (Author), Kachlík David (Author), Volný Ondřej (Author)
Biorender
University notes and lectures