ANAT 215 Lecture Notes - Lecture 18: Greater Trochanter, Toe, Vastus Medialis

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ANATOMY 215
LOWER LIMB (cont’d)
(Reading Materials: Chapter 11: pages 308-321, 327-328; Chapter
22: pages 589-591, 597-598)
Note: To understand the primary function a muscle you need to know
where the muscle comes from (origin) and where it is going to
(insertion).
Muscles that move the thigh (gluteal region): (cross hip joint)
(inferior/superior gluteal nerve, from sacral plexus L5-S5)
posterior:
gluteal maximus- largest, heaviest, cross backside at 45° angle, o=
external surface of ilium, sacrum + coccyx, I= gluteal tuberosity (on femur),
band of tissue on lateral side of femur- ilialtibial tract (iliac crest, lateral thigh,
lateral tibia), extension, lateral rotation, inferior gluteal nerve
gluteal medius- fan/triangle shape, deep to maximus, o= upper/middle
ilium, I= greater trochanter of femur, contract- abduct, medially rotate,
superior gluteal nerve
gluteal minimus- deep to medius, o= lower limb, I= greater trochanter,
abduction, medial rotation, superior gluteal nerve
tensor fasciae latae- o= anterior superior iliac spine, I= iliotibial tract,
oddity because not lateral, nor posterior, superior gluteal nerve
anterior: (nerve?)
iliopsoas:
a) psoas major- long, thick, powerful, o= T12-L5, I= lesser trochanter,
INNERVATION?
b) iliacus- lateral to psoas major, o= anterior surface of ilium, I=
lesser trochanter, INNERVATION?
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Tendons blend in, contract- powerful flexors of thigh at hip joint
Compartments of the thigh: (move leg at knee joint)
anterior (extend leg @ knee) , posterior (flex leg @ knee, extend thigh
@ hip) , medial (adduct thigh)
anterior (extensors of the knee thus they move the leg): (all
femoral nerve, from lumbar plexus L1-L5)
Sartorius- “crossing leg muscle”, long, narrow, strap-like, 2-joint muscle
because crosses hip AND knee, o= anterior superior iliac spine, crosses
anterior of thigh, medial side of knee, I= upper medial surface of tibia,
contract- flex leg at knee, flex thigh at hip, laterally rotate thigh at hip
quadriceps femoris: (all insert on patella)
a) rectus femoris- straight, superficial, o= anterior inferior iliac spine, I=
patella, extend leg at knee, flex thigh at hip= “kicking muscle”
b) vastus medialis- o= linea aspera of femur, I= patella
c) vastus lateralis- o= linea aspera + greater trochanter (posterior
surface of femur)
d) vastus intermedius- o= anterior surface of femur, I= tibia
All wrap around femur, fibers of medialis and lateralis converge and insert on
tibia patellar tendon
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posterior (hamstrings which function to extend the thigh and
flex the knee):
(all o= iscial tuberosity) (all sciatic nerve, from sacral plexus L5-S5)
biceps femoris- (2 heads) o= (long head) iscial tuberosity (short head) linea
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