The anterior corticospinal tract (also called the ventral corticospinal tract, "Bundle of Turck", medial corticospinal tract, direct pyramidal tract, or anterior cerebrospinal fasciculus) is a small bundle of descending fibers that connect the cerebral cortex to the spinal cord. Descending tracts are pathways by which motor signals are sent from upper motor neurons in the brain to lower motor neurons which then directly innervate muscle to produce movement. The anterior corticospinal tract is usually small, varying inversely in size with the lateral corticospinal tract, which is the main part of the corticospinal tract.
Anterior corticospinal tract
Anterior corticospinal tract seen in red at bottom center in figure (text tag found at upper-left).
It lies close to the anterior median fissure, and is present only in the upper part of the spinal cord; gradually diminishing in size as it descends, it ends about the middle of the thoracic region.
It consists of descending fibers that arise from cells in the motor area of the ipsilateral cerebral hemisphere. The impulse travels from these upper motor neurons (located in the pre-central gyrus of the brain) through the anterior column. In contrast to the fibers for the lateral corticospinal tract, the fibers for the anterior corticospinal tract do not decussate at the level of the medulla oblongata, although they do cross over in the spinal level they innervate.[1] They then synapse at the anterior horn with the lower motor neuron which then synapses with the target muscle at the motor end plate. In contrast to the lateral corticospinal tract which controls the movement of the limbs, the anterior corticospinal tract controls the movements of axial muscles (of the trunk).
^Berthold, Daniel Goude, C.-H. "Pyramidbanans främre okorsade del - Tractus cortico-spinalis anterior - Människans nervsystem: Uppslagsverk". nervsystemet.se.{{cite web}}: CS1 maint: multiple names: authors list (link)
Saladin, Kenneth S. "The Spinal Cord, Spinal Nerves, and Somatic Reflexes." Anatomy & Physiology: The Unity of Form and Function. 6th ed. New York: McGraw-Hill, 2012. N. pag. Print.
This article incorporates text in the public domain from page 759 of the 20th edition ofGray's Anatomy(1918)
anterior, corticospinal, tract, anterior, corticospinal, tract, also, called, ventral, corticospinal, tract, bundle, turck, medial, corticospinal, tract, direct, pyramidal, tract, anterior, cerebrospinal, fasciculus, small, bundle, descending, fibers, that, co. The anterior corticospinal tract also called the ventral corticospinal tract Bundle of Turck medial corticospinal tract direct pyramidal tract or anterior cerebrospinal fasciculus is a small bundle of descending fibers that connect the cerebral cortex to the spinal cord Descending tracts are pathways by which motor signals are sent from upper motor neurons in the brain to lower motor neurons which then directly innervate muscle to produce movement The anterior corticospinal tract is usually small varying inversely in size with the lateral corticospinal tract which is the main part of the corticospinal tract Anterior corticospinal tractAnterior corticospinal tract seen in red at bottom center in figure text tag found at upper left Decussation of pyramids Scheme showing passage of various fasciculi from medulla spinalis to medulla oblongata a Pons b Medulla oblongata c Decussation of the pyramids d Section of cervical part of medulla spinalis 1 Anterior cerebrospinal fasciculus in red 2 Lateral cerebrospinal fasciculus in red 3 Dorsal column tracts gracile fasciculus and cuneate fasciculus in blue 3 Gracile and cuneate nuclei 4 Anterolateral corticospinal tract in dotted line 5 Pyramid 6 Lemniscus 7 Medial longitudinal fasciculus 8 Ventral spinocerebellar fasciculus in blue 9 Dorsal spinocerebellar fasciculus in yellow DetailsIdentifiersLatintractus corticospinalis anterior fasciculus cerebrospinalis anteriorNeuroLex IDbirnlex 1618TA98A14 1 02 205TA26112FMA72636Anatomical terminology edit on Wikidata It lies close to the anterior median fissure and is present only in the upper part of the spinal cord gradually diminishing in size as it descends it ends about the middle of the thoracic region It consists of descending fibers that arise from cells in the motor area of the ipsilateral cerebral hemisphere The impulse travels from these upper motor neurons located in the pre central gyrus of the brain through the anterior column In contrast to the fibers for the lateral corticospinal tract the fibers for the anterior corticospinal tract do not decussate at the level of the medulla oblongata although they do cross over in the spinal level they innervate 1 They then synapse at the anterior horn with the lower motor neuron which then synapses with the target muscle at the motor end plate In contrast to the lateral corticospinal tract which controls the movement of the limbs the anterior corticospinal tract controls the movements of axial muscles of the trunk A few of its fibers pass to the lateral column of the same side and to the gray matter at the base of the posterior grey column citation needed Additional images edit nbsp Decussation of pyramids nbsp The motor tract References edit Berthold Daniel Goude C H Pyramidbanans framre okorsade del Tractus cortico spinalis anterior Manniskans nervsystem Uppslagsverk nervsystemet se a href Template Cite web html title Template Cite web cite web a CS1 maint multiple names authors list link Saladin Kenneth S The Spinal Cord Spinal Nerves and Somatic Reflexes Anatomy amp Physiology The Unity of Form and Function 6th ed New York McGraw Hill 2012 N pag Print nbsp This article incorporates text in the public domain from page 759 of the 20th edition of Gray s Anatomy 1918 External links edithier 799 at NeuroNames Overview at thebrain mcgill ca http teachmeanatomy info neuro pathways descending tracts motor Portal nbsp Anatomy Retrieved from https en wikipedia org w index php title Anterior corticospinal tract amp oldid 1208718372, wikipedia, wiki, book, books, library,
