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peduncles of the midbrain. It decussates in the medulla and travels down the lateral corticospinal tract in the lateral column of the spinal cord. It then decussates in the spinal cord and synapses at the anterior horn to the lower motor neurons of the skeletal muscles. The cuneate fasciculus tract is responsible for the sensation of the pronator quadratus position and movement, deep touch, visceral pain, and vibration. This tract begins in the dorsal nerve root where the signal is transmitted through the dorsal horn and up the posterior column of the spinal cord. It synapses with an interneuron in the gracile nucleus. It then decussates in the medial lemniscus of the medulla, travels through the cuneate nucleus and through the medial lemniscus of the midbrain to synapse in the thalamus. It synapses with a third order neuron and transmits the signal to the postcentral gyrus of the somesthetic cortex. This could apply to any muscle in the upper limb and not specific to this muscle.
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The lateral corticospinal tract is responsible for the motor pathway of the pronator quadratus. This tract begins in the precentral gyrus of the motor cortex where a signal is transmitted from the upper motor nerve through the progression tracts of the internal capsule and through the cerebral
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side of the radius towards the ulna, thus pronating the hand. Its deep fibers serve to keep the two bones in the forearm bound together. Moreover, this muscle can be absent in some humans, however, that does not affect the action of pronation very notably, as the
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Tubbs, R. Shane; Goodrich, Dylan; Watanabe, Koichi; Loukas, Marios (2015-01-01), Tubbs, R. Shane; Rizk, Elias; Shoja, Mohammadali M.; Loukas, Marios (eds.),
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Anterior view of left forearm. Deep muscles. (Pronator quadratus visible at bottom-center right.)
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Its fibres run perpendicular to the direction of the arm, running from the most
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from The
Department of Radiology at the University of Washington
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274:When pronator quadratus contracts, it pulls the
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258:Pronator quadratus muscle is innervated by the
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470:Illustration: upper-body/pronator-quadratus
364:Doyle, James R.; Botte, Michael J. (2003).
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203:(turn so the palm faces downwards) the
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886:extensor carpi radialis longus
813:flexor digitorum superficialis
434:"Median Nerves and Neuropathy"
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226:to the distal quarter of the
248:anterior interosseous artery
67:Anterior interosseous artery
1096:flexor digiti minimi brevis
260:anterior interosseous nerve
129:musculus pronator quadratus
83:anterior interosseous nerve
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838:flexor digitorum profundus
432:Leung, Dora (2003-01-01),
172:Anatomical terms of muscle
1229:Muscles of the upper limb
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404:Nerves and Nerve Injuries
345:Pronator quadratus muscle
333:Pronator quadratus muscle
321:Pronator quadratus muscle
309:Pronator quadratus muscle
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19:Pronator quadratus muscle
1063:abductor pollicis brevis
947:extensor pollicis longus
942:extensor pollicis brevis
937:abductor pollicis longus
1101:abductor digiti minimi
1091:opponens digiti minimi
1058:flexor pollicis brevis
907:extensor carpi ulnaris
902:extensor digiti minimi
843:flexor pollicis longus
976:bicipital aponeurosis
803:flexor carpi radialis
1170:extensor retinaculum
808:flexor carpi ulnaris
998:antebrachial fascia
932:anatomical snuffbox
743:triangular interval
700:intermuscular septa
592:infraspinous fascia
587:supraspinous fascia
191:is a square-shaped
1200:palmar aponeurosis
1195:flexor retinaculum
1175:extensor expansion
1019:osborne's ligament
897:extensor digitorum
833:pronator quadratus
733:quadrangular space
667:articularis cubiti
262:, a branch of the
189:Pronator quadratus
1234:Forearm pronators
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296:Additional images
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112:Supinator muscle
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764:compartments
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536:rotator cuff
451:, retrieved
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381:. Retrieved
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264:median nerve
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141:A04.6.02.038
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79:Median nerve
563:teres major
551:teres minor
254:Innervation
244:ulnar notch
118:Identifiers
1223:Categories
1161:posterior:
1129:interossei
1086:hypothenar
876:mobile wad
639:brachialis
453:2021-01-08
419:2021-01-08
383:1 December
377:0397517254
351:References
236:metaphysis
107:Antagonist
1186:anterior:
1124:lumbrical
927:supinator
857:posterior
649:posterior
232:diaphysis
211:Structure
52:Insertion
986:extensor
774:anterior
662:anconeus
621:anterior
519:Shoulder
270:Function
240:proximal
221:anterior
96:Pronates
759:Forearm
705:lateral
531:deltoid
509:of the
507:Muscles
276:lateral
242:to the
201:pronate
197:forearm
100:forearm
91:Actions
36:Details
1151:fascia
1139:palmar
1134:dorsal
1048:thenar
991:flexor
968:fascia
890:brevis
728:spaces
710:medial
677:fascia
634:biceps
573:fascia
444:
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228:radius
217:distal
193:muscle
62:Artery
42:Origin
1007:other
918:deep:
824:deep:
721:other
176:[
165:38453
124:Latin
74:Nerve
1033:Hand
888:and
442:ISBN
408:ISBN
385:2016
372:ISBN
224:ulna
205:hand
153:2493
136:TA98
98:the
606:Arm
511:arm
160:FMA
148:TA2
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