Muscles

Question 1

Psoas Major M. (Illiopsoas M)

Origin, Insertion, Action

Answer 1

O: Lateral portion of the centra/bodies of T12- L5
I: Lesser trochanter of the femur (medially under the head of femur)
A: Laterally flex vertebral column, balances and flexes the thigh when acting with illacus ***CHIEF FLEXOR OF THIGH

Question 2

Psoas Major M.

Innervation and Arterial supply

Answer 2

Lumbar Plexus L1-L3

Illiolumbar artery from common illiac artery

Question 3

Illiacus M. (Illiopsoas M)

Origin, Insertion, Action

Answer 3

O: Superior illiac fossa, ala of sacrum
I: Lesser trochanter
A: Chief flexor of hip, stabilizes hip joint

Question 4

Illiacus M.

Innervation and Arterial supply

Answer 4

Femoral N.

Medial femoral circumflex a. and iliolumbar a.

Question 5

Psoas Minor

Origin, Insertion, Action

Answer 5

I: Lesser Trochanter
A: Flexor of thigh

Question 6

Psoas Minor

Innervation

Answer 6

L1-L2 Ventral Rami

Question 7

Sartorius M.

Origin, Insertion, Action

Answer 7

O: ASIS
I: pes anserine
A: Flex, abduct, laterally rotate thigh

Question 8

Sartorius M.

Innvervation and blood supply

Answer 8

Femoral Nerve

Femoral A

Question 9

Rectus Femoris M.

Origin, Insertion, Action

Answer 9

O: AIIS
I: Tibial Tuberosity
A: Rectus extends leg and flexes thigh

Question 10

Rectus Femoris M.

Innvervation and blood supply

Answer 10

Femoral Nerve

Lateral femoral circumflex a.

Question 11

Vastus Lateralis M.

Origin, Insertion, Action

Answer 11

O: shaft of femur
I: Lateral aspect base of patella, tibial tuberosity
A: Extends leg

Question 12

Vastus Lateralis M.

Innervation and blood supply

Answer 12

Femoral N

Femoral A

Question 13

Nerve roots to know

Answer 13

Femoral Nerve (L2- L4)
Obturator Nerve (L2- L4)
Sciatic Nerve (L4-S3)
-Tibial Nerve L4-S3
- Common Fibular Nerve- L4-S2

Question 14

Vastus medialis M.

Origin, Insertion, Action

Answer 14

O: Interrochanteric line
and medial lip of linea aspera
I: Common quadriceps
tendon and to medial patellar retinacula
A:Extends leg at knee joint

Question 15

Vastus Medialis M

Innervation and blood supply

Answer 15

Femoral N.

Femoral A.

Question 16

Vastus Intermedius M.

Origin, Insertion, Action

Answer 16

O: Anterior and lateral
surfaces of femur shaft
I: Common quadriceps tendon
A: Extends leg at knee cap

Question 17

Vastus Intermedius M.

Innervation and blood supply

Answer 17

Femoral N.

Femoral A.

Question 18

Pectineus M.

Origin, Insertion, Action

Answer 18

O: Superior Ramus of pubis
I: Pectineal line of femur, just inferior to lesser trochanter
A: Adducts and flexes thigh and assists with medial rotation of thigh.

Question 19

Pectineus M

Innervation and blood supply

Answer 19

Femoral n. ( L2 , L3)

Obturator A.

Question 20

Adductor Longus M.

Origin, Insertion, Action

Answer 20

O: Body of pubis inferior to pubic crest
I: Middle 3rd of linea aspera
A: Adducts and flexes thigh

Question 21

Adductor Longus M.

Innervation and blood supply

Answer 21

Obturator Nerve (L2-L4)
Deep Femoral A.

Question 22

Adductor brevis M.

Origin, Insertion, Action

Answer 22

O: Pubis body and inferior ramus
I: Proximal linea aspera
A: Adducts and flexes thigh

Question 23

Adductor brevis M.

Innervation and blood supply

Answer 23

Obturator N.

Deep Femoral A.

Question 24

Gracilis M.

Origin, Insertion, Action

Answer 24

O: Pubis body and inferior ramus
I: Superior part of medial surface of tibia (part of pes anserinus)
A: Adducts thigh
Flex and medially rotates leg
**only adductor to cross knee joint

Question 25

Gracilis M.

Innervation and blood supply

Answer 25

Obturator N.

Medial Circumflex femoral a.

Question 26

Obturator externus M.

Origin, Insertion, Action

Answer 26

O: Margins of obturator foramen/obturator membrane
I: Trochanteric fossa
A: Laterally rotates thigh, steadies head of femur in acetabulum.

Question 27

Obturator externus M.

Innervation and blood supply

Answer 27

Obturator N. and A.