📌 𝐅𝐨𝐥𝐥𝐨𝐰 𝐨𝐧 𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦:- / drgbhanuprakash
📌𝗝𝗼𝗶𝗻 𝗢𝘂𝗿 𝗧𝗲𝗹𝗲𝗴𝗿𝗮𝗺 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝗛𝗲𝗿𝗲:- t.me/bhanuprakashdr
📌𝗦𝘂𝗯𝘀𝗰𝗿𝗶𝗯𝗲 𝗧𝗼 𝗠𝘆 𝗠𝗮𝗶𝗹𝗶𝗻𝗴 𝗟𝗶𝘀𝘁:- linktr.ee/DrGBhanuprakash
Lumbar Plexus Anatomy Animation : Origi, Branches and innervation | USMLE Review
Origin and location
-------------------------------
The lumbar plexus originates from the anterior rami of spinal nerves L1-L4 and is formed largely within the posterior aspect of the psoas major muscle. The anterior ramus of spinal nerve T12 contributes to the formation of the lumbar plexus via the dorsolumbar nerve, which joins the anterior ramus of spinal nerve L1. Together, these roots (T12, L1) form a common trunk which gives rise to the iliohypogastric and ilioinguinal nerves. The anterior rami of L1 and L2 each give rise to a branch, which go on to merge with one another to form the genitofemoral nerve.
As the spinal rami of spinal nerves L2 - L4 course away from the lumbar vertebrae, they divide into anterior (ventral) and posterior (dorsal) divisions. The anterior divisions merge with one another to form the obturator nerve. Sometimes, the anterior divisions of L3 and L4 anterior rami may give branches that unite to form an accessory obturator nerve. Fibers from the posterior divisions, on the other hand, mainly unite to form the femoral nerve. The posterior divisions of L2 and L3 also give rise to branches that merge to form the lateral femoral cutaneous nerve.
The anterior ramus of L4 gives rise to an additional branch which goes on to merge with the anterior ramus of L5 spinal nerve to form the lumbosacral trunk. The lumbosacral trunk joins the anterior rami of sacral spinal nerves S1-S4 in the pelvis to form the sacral plexus. Thus, this branch to the lumbosacral trunk serves as the point of union between the lumbar and sacral plexuses.
Branches and innervation
-----------------------------------------
Muscular branches (T12, L1-4) - psoas major, quadratus lumborum
Iliohypogastric nerve (L1) and ilioinguinal nerve (L1) - transversus abdominis, internal oblique muscles
Genitofemoral nerve (L1, L2) - cremaster muscle
Lateral femoral cutaneous nerve (L2, L3) - skin of the lateral part of the thigh
Obturator nerve (L2, L3, L4) - obturator externus, adductor longus, adductor brevis, gracilis, pectineus, adductor magnus
Accessory obturator nerve (L3, L4) - pectineus, hip joint
Femoral nerve (L2, L3, L4) - Iliopsoas, pectineus, sartorius, quadriceps femoris
Branch to the lumbosacral trunk (L4)
#LumbarPlexusAnatomy #MedEd #Anatomy101 #FutureMedics #StudyMedicine #MedStudentLife #MedicalScience #LearningAnatomy #MedicineTutorial #HealthcareEducation #AnatomyAndPhysiology #MedStudy #MedicalLearning #BiologyBasics #ScienceEducation #Physiology #HumanAnatomy #BioMed #EducationalContent #MedicalContent #SciComm #MedicineMatters #AnatomyClass #PhysiologyClass #MedicalStudents #PreMedLife #AnatomyStudy #EducationMatters #fmge #fmgevideos #rapidrevisionfmge #fmgejan2023 #mbbslectures #nationalexitexam #nationalexittest #neetpg #usmlepreparation #usmlestep1 #fmge #usmle #drgbhanuprakash #medicalstudents #medicalstudent #medicalcollege #neetpg2023 #usmleprep #usmlevideos #usmlestep1videos #medicalstudents #neetpgvideos