Lower Extremity- Muscles of the Thigh

Question 1

What are the attachments of the Iliacus muscle?

Answer 1

Iiac fossa to the lesser trochanter of the femur

Question 2

What are the actions of the Iliacus muscle?

Answer 2

Flexion of the thigh at hip, and stabilizes the hip joint

Question 3

What innervates the Iliacus muscle?

Answer 3

Femoral nerve and lumbar plexus arteries

Question 4

What provides blood to the iliacus muscle?

Answer 4

Femoral artery, iliolumbar, obturator, and deep circumflex iliac arteries.

Question 5

What are the attachments of the Psoas muscle?

Answer 5

From anterior lumbar transverse processes, vertebral bodies, and vertebral discs, to the lesser trochanter of the femur.

Question 6

What are the actions of the Psoas muscle?

Answer 6

Flexes thigh and stabilizes the hip joint

Question 7

What innervates the Psoas muscle?

Answer 7

ventral rami of L1-L3

Question 8

What provides blood to the Psoas muscle?

Answer 8

FOIL-E! Femoral, obturator, iliolumbar, lumbar, and external iliac arteries

Question 9

Rectus femoris muscle

Answer 9

Attachments: from anterior inferior iliac spine & groove of the acetabulum to the base of the patella
Actions: flexes thigh, and extends the leg at the knee
Nerve: femoral n.
Blood supply: femoral, lateral circumflex femoral a.

Question 10

sartorious muscle

Answer 10

Attachments: from anterior superior iliac spine to medial aspect of the proximal tibia
Actions: flexes thigh, abducts thigh, laterally rotates thigh, flexes leg at knee
Nerve: Femoral n.
Blood supply: femoral, lateral circumflex femoral, descending genicular

Question 11

Tensor fascia latea muscle

Answer 11

Attachments: anterior superior iliac spine and adjacent iliac crest to Iliotibial Tract (IT band)
Action: abduct, flex, and medially rotate thigh. assists in maintaining leg extended
Nerve: Superior gluteal nerve
Blood supply: Superior gluteal artery, lateral circumflex femoral, superficial circumflex iliac arteries

Question 12

Vastus intermedius

Answer 12

Attachments: anterior aspect of proximal 2/3 shaft of the femur to the base of the patella
Actions: Extends leg at knee
Nerve: Femoral n.
Blood supply: Femoral artery, profunda femoral artery

Question 13

Vastus lateralis

Answer 13

Attachments: lateral posterior aspect of the femur to the lateral border of the patella
Action: extends the leg at knee
Nerve: Femoral n.
Blood supply: Femoral, lateral circumflex femoral (descending branch), and 1st perforating.

Question 14

Vastus medialis

Answer 14

Attachments: medial posterior aspect of the femur to medial border of the patella
Actions: Extends leg at the knee
Nerve: Femoral n.
Blood supply: Femoral, Profunda femorial, Descending genicular

Question 15

Adductor Brevis

Answer 15

Attachments: inferior pubic ramus to proximal posterior aspect of the femur
Actions: Adducts the thigh at the hip (only!)
Nerve: Obturator n.
Blood supply: Medial circumflex femoral, Obturator, profunda femoral arteries

Question 16

Adductor Longus

Answer 16

Attachments: Pubic crest to the middle posterior aspect of the femur
Actions: Adducts the thigh at the hip, and also flexes the thigh at the hip
Nerve: Obturator n.
Blood supply: PMFD- Profunda femoral, medial circumflex femoral, femoral, descending genicular

Question 17

adductor magnus

Answer 17

Attachments: Ischial tuberosity to posterior femur and adductor tubercle
Actions: Adducts and extends the thigh
Nerve: Obturator n. & Tibial division of the sciatic nerve
Blood supply: FPOD- femoral, profunda femoral, Obturator and descending genicular arteries

Question 18

Gracilis

Answer 18

Attachments: Inferior pubic ramus to the medial proximal aspect of the tibia
Actions: adduct the thigh, medially rotate and flexes the leg
Nerve: Obturator n.
Blood supply: (FP-“With Grace you get a Free Pass”) Femoral, and Profunda femoris

Question 19

Pectineus

Answer 19

Attachments: Superior pubic ramus to proximal posterior femoral shaft
Action: Adducts and flexes thigh
Nerve: Femoral n. & accessory obturator nerve when it exists
Blood Supply: (Move Over For– pectineus) Medial circumflex femoral, Obturator, Femoral a.

Question 20

Obturator Externus

Answer 20

Attachments: External aspect of rim of obturator foramen to trochanteric fossa
Action: laterally rotates thigh
Nerve: Obturator n.
Blood Supply: (MO-ney) Medial circumflex femoral, and obturator a.

Question 21

Biceps femoris

Answer 21

Attachments: Ischial tuberosity (long head) and posterior/lateral femur (short head) to fibular head
Actions: flexes leg (both) and extends thigh (long head)
Nerve: Tibial division of the sciatic nerve (long head), peroneal/fibular division of the sciatic nerve (short head)
Blood supply: (PB-LSG) Perforating brances of profunda femoris, lateral superior genicular

Question 22

Semimembranosus

Answer 22

Attachments: Ischial tuberosity to posterior aspect of medial tibial condyle
Action: extends the thigh, and flexes the leg
Nerve: Tibial division of the sciatic nerve
Blood Supply: (PB) Perforating branches of profunda femoris a.

Question 23

Semitendinosus

Answer 23

Attachments: Ischial tuberosity to proximal medial aspect of the tibia
Action: Extends the thigh and flexes leg
Nerve: Tibial division of the sciatic n.
Blood Supply: (PBM) Perforating branches of profunda femoris, medial circumflex femoral a.