Program of sessions: 7/10 - Spinal Cord 14/10 - Brainsteam and cerebellum 21/10 - Diencephalon 28/10 - Telencephalon 4/11 - Blood Supply, Meninges and.

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Presentation transcript:

Program of sessions: 7/10 - Spinal Cord 14/10 - Brainsteam and cerebellum 21/10 - Diencephalon 28/10 - Telencephalon 4/11 - Blood Supply, Meninges and Cerebrospinal fluid 11/11 - Cranial nerves (III-VII, IX-XII) 18/11 - Eye 25/11 - Ear and VIIIth cranial nerve.

Thalamus Cerebellum Brainstem Cerebral Cortex Receptor Afferent neuron Efferent neuron Effector organ Ascending Pathway Descending Pathway

Surface description of spinal cord Diameter: 2 cm Length: cm (from medulla oblongata or decussation pyramids to L2 vertebra) It has 2 enlargements: Cervical/upper enlargement – C4-Th1 Lumbar/lower enlargement - Th9-Th12 Expansions of gray matter providing nerves for upper and lower limb. Conus medullaris: conical portion of spinal cord (L1-L2) Filum terminale: Extension of pia matter that attaches spinal cord to the first segment of coccyx.

Decussatio pyramidalis

Originally, the spinal cord and vertebral cana have the same length. Vertebral column grows faster. Caudal end of spinal cord: In newborn: L2-L3 In adult: L1-L2 The more caudal the spinal nerve, the more oblique it is. Lumbar puncture: Performed between L3-L4 or L4-L5 (below lowest portion of spinal cord – safe acess)

Spinal nerves 31 pairs: 8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal Anterior Ramus: -Plexus -Costal nn. Posterior Ramus: -Muscles and Sensation of the Back

Posterior horn Anterior root Lateral horn

Grey Matter Nucleus - Nucleus - Mass of neurons which give rise to axons with a common path, termination and function. White Matter Fasciculus – Fasciculus – Bundles of axons of neurons from various sources and targets Tract – Tract – Bundles of axons with the same origin and target.

White Matter Posterior Funiculus – Posterior Funiculus – White matter between the posteromedian sulcus and each dorsolateral sulcus. Anterolateral Funiculus - Anterolateral Funiculus - White matter between posterolateral sulcus and anterior median fissure

Page 20 Fasciculus Gracilis Fasciculus Cuneatus Posteromedian sulcus Dorsolateral sulcus Posteromedian sulcus Ventrolateral sulcus (ventral roots exit) Anterior Median Fissure

Dorsal root afferents and tracts of dorsal funiculus -Pseudounipolar -1st order for all ascending tracts -Convey information from visceral and somatosensory receptors -Synapse with 2nd order neurons in the posterior horn or in brainstem Receptor 2nd order neuron

Dorsal Root Pseudounipolar neurons Ncl. posteromarginalis + Subst. gelatinosa Rolandi Tr. dorsolateralis Lissaueri Nucleus proprius Ncl. thoracicus (Dorsal nlc. of Clarke) Tr. spinocerebellaris ant. Tr. spinocerebellaris post. Tr. spino-olivaris Tr. olivo-spinalis Tr. spino-thalamicus, -reticularis, -tectalis Ncl. intermediomedialis Fasc. gracilis Fasc. cuneatus Tr. spinobulbaris

Fasciculus gracilis: Fasciculus gracilis: From sacral, lumbar and lower six thoracic segments. Fasciculus cuneatus: Fasciculus cuneatus: From upper six thoracic and all cervical segments. Generally speaking: Fasciculus gracilis: Fasciculus cuneatus: Fasciculus gracilis: Sensation of lower limb Fasciculus cuneatus: Sensation of upper limb

Tr. corticospinalis lat. Tr. corticospinalis ant. Tr. rubrospinalis Tr. olivospinalis Tr. vestibulospinalis Tr. reticulospinalis Tr. tectospinalis