Week 7-8 Muscles

Vastus Intermedius OIAI

Origin: Femur (ant. lat. surfaces of upper 2/3 of the body)

Insertion: Tibia (tuberosity, via patella and patellar ligament)

Action: Extends leg at knee joint

Innervation: Femoral

Vastus Medialis OIAI

Origin: Femur (medial lip of linea aspera)

Insertion: Tibia (tuberosity, via patella and patellar ligament)

Action: Extends leg at knee

Innervation: Femoral

Vastus Lateralis OIAI

Origin: Femur (lateral lip of the linea aspera)

Insertion: tibia (tuberosity, via patella and patellar ligament)

Action: Extends leg at knee

Innervation: Femoral

Rectus Femoris OIAI

Origin: Ilium (AIIS)

Insertion: Tibia (tuberosity, via patella and patellar ligament)

Action: Extends leg at knee & flexes thigh at hip

Innervation: Femoral

Iliacus OIAI

Origin: Ilium (superior 2/3 of the fossa)

Insertion: Femur (lesser trochanter)

Action: Flexion of the thigh at the hip

Innervation: Femoral

Psoas major OIAI

Origin: L1-L5 (TPs and bodies) and discs

Insertion: Femur (lesser trochanter)

Action: Flexion of thigh at the hip & flexion of the trunk

Innervation: lumbar plexus

Gemellus superior OIAI

Origin: Ischium (spine, external)

Insertion: Femur (greater trochanter)

Action: Lateral rotation of the thigh at the hip

Innervation: sacral plexus

Obturator internus OIAI

Origin: Posterior ischium, obturator membrane

Insertion: Femur (medial surface of greater trochanter)

Action: Lateral rotation of thigh at hip

Innervation: Sacral plexus

Gemellus inferior OIAI

Origin: Ischium (tuberosity, proximal)

Insertion: Femur (greater trochanter)

Action: Lateral rotation of the thigh at the hip

Innervation: Sacral plexus

Obturator externus OIAI

Origin: Pubis and ischium (obturator foramen)

Insertion: Femur (trochanteric fossa)

Action: Lateral rotation of thigh at the hip

Innervation: Obturator nerve

Quadratus femoris OIAI

Origin: Ischium (tuberosity, lateral border)

Insertion: Femur (crest between trochanters)

Action: Lateral rotation of the thigh at the hip joint

Innervation: Sacral plexus

Piriformis OIAI

Origin: Sacrum (ant. surface)

Insertion: Femur (sup. greater trochanter)

Action: Lateral rotation of the thigh at the hip

Innervation: Sacral plexus

Pectineus OIAI

Origin: Pubis

Insertion: Femur (pectineal line)

Action: Adduction of the thigh at the hip joint & flexion at the hip

Innervation: Femoral AND obturator

Adductor longus OIAI

Origin: Pubis (ant. body)

Insertion: Femur (linea aspera, middle 1/3)

Action: Adduction of the thigh at the hip

Innervation: Obturator

Adductor brevis OIAI

Origin: Pubis

Insertion: Femur (linea aspera - proximal 1/3)

Action: Adduction of the thigh at the hip joint

Innervation: Obturator

Adductor magnus OIAI

Origin: Pubis and ischium

Insertion: Femur (linea aspera)

Action: Adduction of the thigh at the hip

Innervation: Obturator

Semimembranosus OIAI

Origin: Ischium (tuberosity)

Insertion: Tibia (posterior and medial condyle)

Action: Flexion of the leg at the knee & extension of the thigh at the hip

Innervation: Sciatic nerve

Semitendinosus OIAI

Origin: Ischium (tuberosity)

Insertion: Tibia (part of the pes anserine tendon)

Action: Flexion of the leg at the knee & extension of the thigh at the hip

Innervation: Sciatic

Biceps femoris OIAI

Origin: Long head - ischium (tuberosity) & short head - femur

Insertion: Fibula (lateral head), tibia (lateral condyle)

Action: Flexion of the leg at the knee & extension of the thigh at the hip joint

Innervation: Sciatic

Gluteus minimus OIAI

Origin: Ilium (inferior lateral)

Insertion: Femur (greater trochanter, anterior surface)

Action: Medial rotation and abduction of the thigh at the hip

Innervation: Superior gluteal

Gluteus medius OIAI

Origin: Ilium (superior lateral)

Insertion: Femur (greater trochanter, lateral surface)

Action: Abduction and medial rotation of the thigh at the hip joint

Innervation: Superior gluteal

Gluteus maximus OIAI

Origin: Ilium, sacrum, and coccyx

Insertion: Femur and iliotibial tract

Action: Lateral rotation and extension of thigh at hip joint

Innervation: Inferior gluteal

Tensor fasciae latae OIAI

Origin: Ilium (ASIS)

Insertion: Iliotibial tract

Action: Flexion and abduction of the thigh at the hip joint

Innervation: Superior gluteal

Gracilis OIAI

Origin: Pubis

Insertion: Tibia (part of the pes anserine)

Action: Adduction of the thigh at the hip

Innervation: Obturator

Sartorius OIAI

Origin: Ilium (ASIS)

Insertion: Tibia (part of pes anserine)

Action: Flexes thigh at the hip & flexes leg at knee

Innervation: Femoral

The hip is what type of joint?

Ball and socket

The common fibular nerve branches into what 2 nerves?

Superficial, deep

Which of the four quadriceps muscle only acts at the hip joint?

Rectus femoris

What 3 muscles are in the hamstrings?

Semimembranosus

Semitendinosus

Biceps femoris

Where do the hamstrings “act”?

Hip & knee joints

What 3 unprotected structures are found in the popliteal fossa?

1. Tibial nerve

2. Common fibular/peroneal nerve

3. Popliteal artery and vein