ANAT30007 Lecture Notes - Lecture 17: Vastus Medialis, Vastus Intermedius Muscle, Vastus Lateralis Muscle
20 May 2018
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Flexes, abducts and laterally rotates thigh at hip joint; flexes the leg at knee joint
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Lets you sit cross-legged
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NS: femoral nerve
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Knee extensors
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Rectus femoris: from AIIS. 2-joint muscle (can work as prime mover at knee and
synergist for iliopsoas), hip flexion limited by knee extension (passive insufficiency) -
susceptible to over-stretch
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Vastus medialis: intertrochanteric line and medial lip of linea aspera
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Vastus lateralis: Greater trochanter and lateral lip of linea aspera
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Vastus intermedius (deep): shaft of femur
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All insert in quadriceps tendon on base of patella and tibial tuberosity via patellar
ligament
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Quadriceps femoris
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Patella has tendency to dislocate laterally, prevented by oblique fibres of vastus medialis,
capsule of knee joint, lip of lateral condyle of femur
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‘corked’ thigh: bleeding in thigh caused by impact of muscle against bone, e.g. in contact
sports
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quadriceps m. strain
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Clinical Significance:
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Nerve supply: femoral nerve
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Anterior thigh
Locomotor Page 10
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Medial compartment
Adductor longus (superficial)/brevis (intermediate)
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From inferior pubic ramus (adductor part), ischial tuberosity (hamstring part; origin of
hamstring muscles), inserts on shaft of femur (adductor) and distal femur (adductor
tubercle, hamstring part)
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2-compartment (medial+posterior) muscle - hip adductor/flexor and knee lateral rotator
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Nerve supply: obturator (adductor part) and tibial (hamstring part) nerves
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Adductor magnus (deep):
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Adductor and internal rotator
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crosses knee -> pes anserinus (foot of goose)
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Gracilis: from body and inferior ramus of pubis to superior part of medial surface of tibia
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Obturator externus: from external surface of obturator foramen/membrane, to medial aspect
of greater trochanter of femur. Adduction and works with posterior compartment lateral
fixators of hip joint
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Adductors (horseriding muscles) that all start from pubis and insert along shaft of femur
Locomotor Page 11
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Obturator n. (L234)
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Exception: Tibial n. (L5-S3; to 1/2 add. Magnus)
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Nerve supply
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Adductor m. strain
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Osteitis pubis: inflammation of the pubic symphysis
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Clinical significance:
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Lateral compartment
Abductor (gluteal muscles)
Locomotor Page 12
Document Summary
Flexes, abducts and laterally rotates thigh at hip joint; flexes the leg at knee joint. 2-joint muscle (can work as prime mover at knee and synergist for iliopsoas), hip flexion limited by knee extension (passive insufficiency) - susceptible to over-stretch. Vastus medialis: intertrochanteric line and medial lip of linea aspera. Vastus lateralis: greater trochanter and lateral lip of linea aspera. All insert in quadriceps tendon on base of patella and tibial tuberosity via patellar ligament. Patella has tendency to dislocate laterally, prevented by oblique fibres of vastus medialis, capsule of knee joint, lip of lateral condyle of femur. Clinical significance: (cid:858)(cid:272)orked(cid:859) thigh: (cid:271)leedi(cid:374)g i(cid:374) thigh (cid:272)aused (cid:271)(cid:455) i(cid:373)pa(cid:272)t of (cid:373)us(cid:272)le agai(cid:374)st (cid:271)o(cid:374)e, e. g. i(cid:374) (cid:272)o(cid:374)ta(cid:272)t sports quadriceps m. strain. Adductors (horseriding muscles) that all start from pubis and insert along shaft of femur. From inferior pubic ramus (adductor part), ischial tuberosity (hamstring part; origin of hamstring muscles), inserts on shaft of femur (adductor) and distal femur (adductor tubercle, hamstring part)
