Thigh Muscle Notes

Thigh Muscle Notes Anterior Thigh Muscles Name Sartorius Origin Anterior superior iliac spine (ASIS) Insertion Proximal end of tibia below medial condyle (via pes anserinus) Innervation Femoral nerve (L2L3) Rectus Femoris Anterior inferior iliac spine, supraacetabular groove Tibial tuberosity (via patellar ligament), patella Femoral nerve (L2L4) Vastus Medialis Intertrochanteric line, pectineal line of femur, linea aspera, medial supracondylar line of femur Intertrochanteric line, greater trochanter, gluteal tuberosity, linea aspera of femur Tibial tuberosity (via patellar ligament), patella, (medial condyle of tibia) Femoral nerve (L2L4) Tibial tuberosity (via patellar ligament), patella, (lateral condyle of tibia) Femoral nerve (L2L4) Vastus Anterior surface of Intermedius femoral shaft Tibial tuberosity (via patellar ligament), patella Femoral nerve (L2L4) Pectineus Pectineal line of femur, linea aspera of femur Vastus Lateralis Superior pubic ramus (pectineal line of pubis) • • Femoral nerve (L2, L3) (Obturator nerve (L2, L3)) Function • Hip joint: thigh flexion, thigh abduction, thigh external rotation. • Knee joint: leg flexion, leg internal rotation • Hip joint: Thigh flexion (rectus femoris only). • Knee joint: Leg extension • Hip joint: Thigh flexion (rectus femoris only); • Knee joint: Leg extension • Hip joint: Thigh flexion (rectus femoris only); • Knee joint: Leg extension • Hip joint: Thigh flexion (rectus femoris only); • Knee joint: Leg extension Hip joint: Thigh flexion, thigh adduction, thigh external rotation, thigh internal rotation; pelvis stabilization Medial Thigh Muscles Name Gracilis Origin Anterior body of pubis, inferior pubic ramus, ischial ramus Insertion Medial surface of proximal tibia (via pes anserinus) Innervation Obturator nerve (L2-L3) Adductor Anterior body of pubis, brevis inferior pubic ramus Linea aspera of femur (medial lip) Obturator nerve (L2-L3) Function • Hip joint: Thigh flexion, thigh adduction. • Knee joint: leg flexion, leg internal rotation Hip Joint: thigh flexion, thigh adduction, thigh external rotation, pelvis stabilization Adductor Body of pubis, inferior to longus pubic crest and lateral to the pubic symphysis Adductor • Adductor part: magnus Inferior pubic ramus, ischial ramus • Ischiocondylar part: Ischial tuberosity Medial third of linea aspera of femur (medial lip) • Adductor part: Gluteal tuberosity, linea aspera (medial lip), medial supracondylar line • Ischiocondylar part: Adductor tubercle of femur Obturator nerve (L2-L3) • • Adductor part: Obturator nerve (L2-L4) Ischiocondylar part: Tibial division of sciatic nerve (L4) Mnemonic: African Mouse Sneaks Out (refers to Adductor Magnus Sciatic Obturator) Hip Joint: thigh flexion, thigh adduction, thigh external rotation, pelvis stabilisation • Adductor part: - Hip joint - Thigh flexion, thigh adduction, thigh external rotation. • Hamstring part: - Hip joint - Thigh extension, thigh internal rotation. - Entire muscle: Pelvis stabilization Posterior Thigh Muscles Name Semitendinosus Origin (Posteromedial impression of) Ischial tuberosity Semimembranosus Superolateral impression of ischial tuberosity • Biceps femoris • Long head: (inferomedial impression of) ischial tuberosity, sacrotuberous ligament Short head: linea aspera of femur (lateral lip), lateral supracondylar line of femur Insertion Proximal medial tibia Innervation Tibial division of sciatic nerve (L5-S2 Medial condyle of tibia Tibial division of sciatic nerve (L5 – S2) (Lateral aspect of) head of fibula • • Long head: tibial division of sciatic nerve (L5S2) Short head: common fibular division of sciatic nerve (L5S2) Function • Hip joint: Thigh extension, thigh internal rotation, stabilizes pelvis. • Knee joint: Leg flexion, leg internal rotation. • Hip joint: thigh extension and internal rotation. • Knee joint: flexion and internal rotation of the leg • Stabilizes pelvis • Hip joint: thigh extension, thigh external rotation. • Knee joint: leg flexion, leg external rotation; stabilizes pelvis For the following blood vessels and nerves, identify the origin, course and major branches Arteries • Internal iliac - Superior and inferior gluteal • • - Internal pudendal - Obturator Femoral - Profunda femoris - Perforating (3) - Medial and lateral circumflex Popliteal - Tibial - Sural - Genicular Veins • • Superficial - Great saphenous Depp veins - Femoral - Popliteal - Venae Commitantes of arteries ✓ (usually) paired veins travelling and lying either side of a particular artery (of the same name) Nerves • • • Femoral - Saphenous nerve Obturator Sciatic