lec 11 anterior hip muscles & blood supply to lower limb

Question 1

Is the psoas minor found in everyone?

Answer 1

no

Question 2

What two muscles make up the iliopsoas?

Answer 2

iliacus and psoas major

Question 3

Psoas major (ventral & dorsal fibers)

Answer 3

O: ventral - from IV discs and vertebral bodies of T12-L5
Dorsal - from inferior edges of transverse processes of L1-L5

I: all fibers converge into single muscle belly and through the combined tendon with iliacus into lesser trochanter

I: L1-L3 (twigs from ventral rami)

A: major hip flexor, side bending, pelvic stabilization during gait; other actions are considered

Question 4

iliacus

Answer 4

O: iliac fossa, internal lip of iliac crest, lateral part of pelvic surface of sacrum, ventral sacroiliac and iliolumbar ligs.

I: thru combined tendon with psoas major into lesser trochanter and femoral shaft distal to lesser trochanter

I: L2 & L3(twigs from ventral rami)

A: major hip flexor; other actions are considered

Question 5

Psoas minor

Answer 5

O: (anterior to major) from T12 & L1 vertebral bodies and disc

I: iliopubic eminence where pubis and ilium meet

I: L1 (twig from ventral ramus)

A: weak trunk flexion (does NOT cross hip

Question 6

lumbar plexus emerges ___ ventral and dorsal fibers of psoas major

Answer 6

between

Question 7

which muscles provide stability to hip joint anteriorly

Answer 7

psoas major and iliacus

Question 8

What are the actions of the psoas and the iliacus?

Answer 8

trunk flexion and hip flexion

Question 9

Which nerve in the lumbar plexus is the only one containing ventral fibers?

Answer 9

obturator

Question 10

Which nerves will we discus that contain dorsal fibers?

Answer 10

Lateral cutaneous nerve of thigh
Femoral nerve
Muscular branches of the psoas and iliacus muscles

Question 11

nearly all of blood to lower extremity passes through what system

Answer 11

common iliac arterial system

Question 12

most of blood to lower extremity is carried by what artery

Answer 12

external iliac that becomes femoral

Question 13

internal iliac artery supplies what

Answer 13

gluteal region and medial thigh

Question 14

When does the external iliac become the femoral?

Answer 14

When it crosses under the ilioinguinal ligament

Question 15

What are the four gateways to the lower

Answer 15

1. Subinguinal space
2. Obturator canal
3. Greater sciatic foramen
4. Lesser sciatic foramen

Question 16

what is in sublinguinal space

Answer 16

femoral vessels &nerve
lympthatics
iliopsoas
pectineus

Question 17

what is in obturator canal

Answer 17

obturator vessels and nerve

Question 18

what is in greater sciatic foramen

Answer 18

Superior and inferior gluteal vessels & nerves, sciatic nerve, pudendal nerve, internal pudendal vessels, posterior cutaneous nerve of the thigh, nerves to the small lateral rotators of the thigh, tendon of piriformis

Question 19

What can be found in the lesser sciatic foramen?

Answer 19

Pudendal nerve
Internal pudendal vessels
Tendon of obturator internus
Nerve to obturator internus