Innervation Tibial division motor semitendinous semimembranous long head biceps femoris gastrocnemius popliteus plantaris soleus tibialis posterior flexor digitorum longus flexor hallucis longus sensory innervation none Peroneal division motor abductor hallucis flexor digitorum brevis flexor hallucis brevis foot lumbricals quadratus plantae flexor digiti minimi adductor hallucis foot interossei abductor digiti minimi sensory articular branch to knee joint sural nerve branch runs distal with the small saphenous vein anastomoses with a branch from the peroneal nerve continues distal on lateral aspect of the Achilles tendon terminates as the lateral dorsal cutaneous nerve of the foot common peroneal nerve motor short head of biceps femoris deep peroneal nerve motor leg tibialis anterior extensor digitorum longus peroneus tertius extensor hallucis longus foot extensor digitorum brevis (lateral terminal branch) extensor hallucis brevis (lateral terminal branch) sensory articular branch to the ankle joint medial terminal branch: 1st dorsal webspace superficial peroneal nerve motor lateral compartment of leg peroneus longus peroneus brevis sensory majority of skin on the dorsum of foot, excluding webspace between hallux and second digit (deep peroneal nerve) anterolateral distal 1/3 of leg Origin The sciatic nerve originates from lumbosacral plexus L4-S3 tibial division orginates from anterior preaxial branches of L4,L5,S1,S2,S3 peroneal division originates from from postaxial branches of L4,L5,S1,S2 Course Exits sciatic notch runs anterior or deep to piriformis runs posterior or superficial to short external rotators (superior gemellus, inferior gemellus, obturator internus) Posterior leg It then runs down the posterior leg where it breaks into its three main divisions at the level of the mid thigh Terminal branches common peroneal nerve tibial nerve Injury & Clinical Conditions Iatrogenic Injury methods to prevent injury routine visual identification not advised in primary THA palpation recommended visual identification is recommended in revision THA hip extension, knee flexion decreases tension on nerve
QUESTIONS 1 of 5 1 2 3 4 5 Previous Next (OBQ18.218) Which of the following statements regarding the peroneal division of the sciatic nerve is true? QID: 213114 Type & Select Correct Answer 1 It crosses anterior to the lateral head of the gastrocnemius muscle through the posterior intermuscular septum 19% (525/2773) 2 An injury at the level of the thigh will denervate the branches to the short head of the biceps and the tibialis anterior 49% (1361/2773) 3 It is most commonly injured during an anterior knee dislocation 11% (312/2773) 4 The deep division initially runs medial to the tibial artery and later crosses over to become lateral 14% (377/2773) 5 It originates from the L3-S1 nerve roots 6% (176/2773) L 1 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ11.108) During total hip arthroplasty (THA) via a posterior approach, where is the sciatic nerve most likely to be found? QID: 3531 Type & Select Correct Answer 1 Superficial to the piriformis and superficial to the short external rotators 4% (219/5420) 2 Superficial to the piriformis and deep to the short external rotators 9% (493/5420) 3 Deep to the piriformis and deep to the short external rotators 5% (263/5420) 4 Deep to the piriformis and superficial to the short external rotators 80% (4343/5420) 5 Splits the piriformis and is superficial to the short external rotators 1% (72/5420) L 1 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK
All Videos (2) Podcasts (1) Login to View Community Videos Login to View Community Videos The Sciatic Nerve Anatomy - Origin , Course , Relations , Branches , Clinical application Dr Bhanu Prakash Gundepalli Anatomy - Sciatic nerve B 7/25/2017 1865 views 4.9 (11) Login to View Community Videos Login to View Community Videos 2013 Miller / Orthobullets Virtual Review Curriculum Rehab & Anatomy Webinar - Rehab & Anatomy Exam #12 (61D193) Derek W. Moore Anatomy - Sciatic nerve C 6/30/2012 3124 views 4.6 (5) Anatomy⎪Sciatic nerve Anatomy - Sciatic nerve Listen Now 12:25 min 8/13/2020 429 plays 4.0 (2)