Muscles of Lower Half

Question 1

tensor fascia lata

Answer 1

O = ASIS, lip of iliac crest to IT tract (lat. condyles of tibia)
N = sup. gluteal n. (L45); 
A = superior gluteal a.

Question 2

sartorius

Answer 2

LONGEST M IN THE BODY
O = ASIS to medial tibia
N = femoral n. (L23)
A = femoral a.

Question 3

rectus femoris

Answer 3

O = AIIS and superior groove to patella
N = femoral n. 
A = lat. femoral circumflex a.

Question 4

vastus lateralus

Answer 4

O = greater trochanter to patella
N = femoral n. 
A = lat. fem. circ. and superior genicular aa.

Question 5

vastus medialis

Answer 5

O = intertrochanteric line and linea aspera to patella
N = femoral n 
A = femoral and profunda femoral a.

Question 6

vastus intermedius

Answer 6

O = anterolateral femur to patella
N = femoral n.
A = lat. fem. circ. a.

Question 7

adductor longus

Answer 7

MOST ANTERIOR
O = body of pubis to linea aspera
N = Obturator n
A = med. fem. circ. a.

Question 8

pectineus

Answer 8

O = pecten pubis to pectineal line of femur
N = femoral n (L23)
A = med. fem. circ. a.

Question 9

adductor brevis

Answer 9

DEEP TO PECTINEUS AND ADDUCTOR LONGUS
O = ramus of pubis to pectineal line and linea aspera
N = obturator n
A = med. fem. circ. a.

Question 10

adductor magnus

Answer 10

O1 = ischiopubic ramus and ischial tuberosity to gluteal tuberosity
O2 = linea aspera to adductor tubercle of femur (ham part)
N1 = Oburator n. 
N2 = tibial part of sciatic n.
A = med. fem. circ., profunda femoris, popliteal aa.

Question 11

gracilis

Answer 11

O = ramus of pubis to media tibia
N = obturator n.
A = profunda femoris, obturator aa.

Question 12

what spinal level is obturator n?

Answer 12

L2,3,4

Question 13

what spinal level is femoral n.?

Answer 13

L2,3,4

Question 14

obturator externus

Answer 14

O = obturator foramen and membrane to trochanteric fossa of femur
N = obturator n. (L34)
A = obturator and med. fem. circ. aa.

Question 15

external anal sphincter

Answer 15

O = subQ is to corrugator ani; superfic is to coccyx and anococcygeal lig; deep is to perineal body and blends to puborectalis
N = inferior rectal nn (somatic)
A = inferior rectal a.

Question 16

internal anal sphincter

Answer 16

O = upper 2/3 of anus
N = Sy tonus, PSy inhibits contraction
A = inferior rectal a.

Question 17

diaphragm origins

Answer 17

xiphoid, lower 6 costal cartilages, ant. long. ligament, transverse processes of L1-2, bodies of L 1-3, rib 12

Question 18

diaphragm n.

Answer 18

motor = phrenic n.
sensory = phrenic, intercostal nn.
pain = referred to C4 dermatome

Question 19

diaphragm a

Answer 19

superior = pericardiacophrenic a, musculophrenic a, sup. phrenic a., 
inferior = inferior phrenic a (from abdominal aorta)

Question 20

psoas major

Answer 20

O = transferse processes, bodies, discs of T12-L5 courses deep to inguinal lig. to lesser trochanter
N = lumbar plexus

Question 21

psoas minor attachments

Answer 21

T12-L1 body to iliopubic eminience of hip bone

Question 22

iliacus

Answer 22

O = upper iliac fossa, courses lateral to psoas to lesser trochanter
N = femoral n.

Question 23

Quadratus lumborum

Answer 23

O = iliolumbar lig, iliac crest, transverse processes to rib 12
N = lumbar plexus

Question 24

obturator internus

Answer 24

O = pelvic surface of obturator membrane and obturator foramen to the medial surface of greater trochanter
N = n. to obturator internus (L5-S1)
A = muscular branch of internal pudendal, inf. gluteal aa.

Question 25

piriformis

Answer 25

O = ant. surface of sacrum and sacrotubrous lig to superior part of greater trochanter
N = ventral rami S1-2
A = superior gluteal, inferior gluteal, internal pudendal