PYRAMIDAL TRACTS

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DESCENDING TRACTS OF SPINAL CORD:

DESCENDING TRACTS OF SPINAL CORD

Descending tracts:

Descending tracts PYRAMIDAL Corticospinal Corticonuclear EXTRAPYRAMIDAL Tectospinal Rubrospinal Reticulospinal Vestibulospinal Olivospinal

ANATOMICAL ORGANIZATION:

ANATOMICAL ORGANIZATION First order neurons : cell body in cerebral cortex. Second order neurons: lower motor neuron in ant gray column or motor nuclei of cranial nerves.

CORTICOSPINAL TRACTS:

CORTICOSPINAL TRACTS Voluntary, discrete, skilled movements especially those of distal part of limbs. They confer speed & agility to voluntary movements ( rapid skilled movements.)

PowerPoint Presentation:

PYRAMIDAL TRACTS

MOTOR HOMUNCULUS:

MOTOR HOMUNCULUS Face is situated inferiorly & that controlling lower limb is situated superiorly

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COURSE

PowerPoint Presentation:

Facilitates the activity of flexors & inhibits the activity of extensor muscles.

LESIONS OF CORTICOSPINAL TRACTS:

LESIONS OF CORTICOSPINAL TRACTS UPPER MOTOR NEURON Lesions above the pyramids : Contralateral paralysis Lesion below the pyramids : Ipsilateral paralysis. Features: Loss of performance of fine skilled voluntary movements. Babinski ᾿ s sign is present Tendon reflexes are exaggerated Superficial abdominal & Cremasteric reflexes are absent.

Applied Anatomy:

Applied Anatomy Lesion in motor cortex – localized paralysis e.g. monoplegia . Lesion in Internal Capsule – Contralateral hemiplegia Contralateral paralysis of lower face and tongue may also be present . Lesion in Mid Brain – (Weber’s Syndrome) Contralateral hemiplegia involving also lower face & tongue. Ipsilateral paralysis of ocular ms supplied by 3 rd cranial nerve

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. Lesion in Pons – ( Millard Gubler Syndrome) Contralateral hemiplegia Ipsilateral paralysis of lateral rectus ms supplied by 6 th cranial nerve. Lesion in Medulla Oblongata – causes Medial medullary syndrome. Lesion in Spinal Cord – Brown sequard syndrome .

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